From 036ef3cc6f4da8d2f3f2a52c2b0cb4692ade9177 Mon Sep 17 00:00:00 2001
From: Justin Visser <juzt1n@live.nl>
Date: Mon, 10 Aug 2026 15:04:17 +0200
Subject: [PATCH] feat(frontend): assemble accessible application shell

---
 docs/logboek.md                               |  50 ++-
 frontend/index.html                           |   1 +
 frontend/public/favicon.svg                   |   6 +-
 frontend/src/App.vue                          |   9 +-
 frontend/src/components/AppHeader.vue         | 140 +++++++++
 frontend/src/components/AssistantMessage.vue  | 132 ++++++++
 frontend/src/components/AuthStatus.vue        | 128 ++++++++
 frontend/src/components/ChatView.vue          | 123 ++++++++
 frontend/src/components/DevPanel.vue          | 285 ++++++++++++++++++
 frontend/src/components/EmptyResults.vue      |  28 ++
 frontend/src/components/EmptyState.vue        |  72 +++++
 frontend/src/components/MessageInput.vue      | 139 +++++++++
 frontend/src/components/MessageList.vue       | 130 ++++++++
 frontend/src/components/ModeBanner.vue        |  36 +++
 frontend/src/components/PlaylistError.vue     |  17 ++
 frontend/src/components/PlaylistSaved.vue     |  64 ++++
 frontend/src/components/RequestMetadata.vue   |  30 ++
 frontend/src/components/ResultActions.vue     |  74 +++++
 frontend/src/components/ResultSet.vue         |  20 ++
 frontend/src/components/StreamError.vue       |  37 +++
 frontend/src/components/StreamWarning.vue     |  20 ++
 frontend/src/components/SuggestionChips.vue   |  59 ++++
 frontend/src/components/ThinkingIndicator.vue |  54 ++++
 frontend/src/components/TrackCard.vue         | 169 +++++++++++
 frontend/src/components/UserMessage.vue       |  26 ++
 frontend/src/lib/suggestions.ts               |   9 +
 frontend/vite.config.ts                       |   7 +-
 27 files changed, 1852 insertions(+), 13 deletions(-)
 create mode 100644 frontend/src/components/AppHeader.vue
 create mode 100644 frontend/src/components/AssistantMessage.vue
 create mode 100644 frontend/src/components/AuthStatus.vue
 create mode 100644 frontend/src/components/ChatView.vue
 create mode 100644 frontend/src/components/DevPanel.vue
 create mode 100644 frontend/src/components/EmptyResults.vue
 create mode 100644 frontend/src/components/EmptyState.vue
 create mode 100644 frontend/src/components/MessageInput.vue
 create mode 100644 frontend/src/components/MessageList.vue
 create mode 100644 frontend/src/components/ModeBanner.vue
 create mode 100644 frontend/src/components/PlaylistError.vue
 create mode 100644 frontend/src/components/PlaylistSaved.vue
 create mode 100644 frontend/src/components/RequestMetadata.vue
 create mode 100644 frontend/src/components/ResultActions.vue
 create mode 100644 frontend/src/components/ResultSet.vue
 create mode 100644 frontend/src/components/StreamError.vue
 create mode 100644 frontend/src/components/StreamWarning.vue
 create mode 100644 frontend/src/components/SuggestionChips.vue
 create mode 100644 frontend/src/components/ThinkingIndicator.vue
 create mode 100644 frontend/src/components/TrackCard.vue
 create mode 100644 frontend/src/components/UserMessage.vue
 create mode 100644 frontend/src/lib/suggestions.ts

diff --git a/docs/logboek.md b/docs/logboek.md
index fc98d85..e6d274c 100644
--- a/docs/logboek.md
+++ b/docs/logboek.md
@@ -77,14 +77,14 @@ Wat ik deed:
 
 - Domeinbasis: titel/artiest-matching (normalisatie, met tolerantie voor
   Spotify's versie-suffixen zoals "- Remaster 2023"), compressie van het
-  Spotify-smaakprofiel naar prompttekst plus een set bekende track-ids,
+  Spotify taste profile naar prompttekst plus een set bekende track-ids,
   prompts als data in een eigen module, en alle instelbare waarden
   gesectioneerd in de config met per waarde het waarom.
 - Twee LLM-calls achter een eigen interface: call 1 interpreteert de
-  vraag (stemming, activiteit, taal, bekendheid) en stelt 30-40 echte
+  vraag (mood, activity, language, familiarity) en stelt 30-40 echte
   nummers voor als gestructureerde output; call 2 herordent uitsluitend
-  geverifieerde nummers en streamt per nummer een eerlijke onderbouwing.
-  Elke output wordt gevalideerd, met hooguit 1 herstelpoging.
+  geverifieerde nummers en streamt per nummer een eerlijke justification.
+  Elke output wordt gevalideerd, met hooguit 1 correctie-retry.
 - Grounding: begrensde parallelle search fan-out met early stop, een deadline,
   een naam-naar-id cache en twee aparte metrieken: niet gevonden versus
   wel gevonden maar afgekeurd door de match-check. Een track-id dat niet in
@@ -96,7 +96,7 @@ Wat ik deed:
 
 Waarom:
 
-- De LLM is hier de aanbeveler, maar mag alleen creatief zijn tussen twee
+- De LLM is hier de recommender, maar mag alleen creatief zijn tussen twee
   deterministische muren: alles wat hij ziet is echte data, alles wat de
   gebruiker ziet is geverifieerd op Spotify. Een verzonnen nummer valt
   stilletjes af en verschijnt nooit.
@@ -165,7 +165,7 @@ Wat ik deed:
 - Per unresolved kandidaat wordt titel, artiest en status gelogd, zodat
   zichtbaar is WAT het model verzon in plaats van alleen hoeveel.
 
-### Eerlijke gedeeltelijke resultaten
+### Eerlijke partial results
 
 Wat ik deed:
 
@@ -201,3 +201,41 @@ Waarom:
 - De frontend is de tweede consument van het bevroren contract: elke event
   wordt tegen de TypeScript-union gevalideerd in plaats van los geparst;
   wat niet valideert is een transport failure, geen gok.
+
+### Frontend: componenten en app shell
+
+Dit deel is grotendeels geautomatiseerde omzetting: het UI bouwpakket uit
+Open Design heb ik door een cli agent laten converteren naar Vue single file components
+tegen het bevroren contract. De transportlaag eronder (stream client,
+validatie) komt uit de vorige stap. Review- en hardeningpassen op dit
+resultaat volgen hierna als eigen stappen; wat hier staat is de ruwe
+conversie.
+
+Wat ik deed:
+
+- Alle componenten uit het bouwpakket laten omzetten: chat view,
+  composer met suggestion chips, streamende track cards met album covers
+  en een justification per nummer, warning banners, error states, login-status,
+  mode banner en een dev panel.
+- App shell met keyboard-navigatie, focus management en reduced-motion
+  support.
+
+Waarom:
+
+- Het bouwpakket was hierop ontworpen; de componenten volgen de tokens en
+  states daaruit, en elke regel gaat alsnog door review voordat die op
+  main landt.
+- Styling is scoped CSS per component bovenop globale design tokens
+  (custom properties). Scoped omdat machine-geconverteerde componenten
+  om style leakage te voorkomen, en  omdat het bouwpakket al gewone CSS 
+  per component leverde: een utility
+  framework had een rewrite plus een extra dependency gekost. De
+  tokens houden het thema op 1 plek, dus het bekende scoped-CSS risico
+  (waarden die per component uiteenlopen) is afgedekt.
+
+Wat ik heb laten vallen of uitgesteld:
+
+- Een lijst met eerdere chats. Gesprekken leven bewust alleen client-side
+  en de server bewaart niets; een history-lijst kan later contract-schoon
+  via localStorage, zonder server-state. Potentiele extra als er tijd
+  over is, geen onderdeel van de kern.
diff --git a/frontend/index.html b/frontend/index.html
index 0ec46d0..624cf41 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -4,6 +4,7 @@
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="theme-color" content="#0b0c0b" />
     <title>discovery-by-llm</title>
   </head>
   <body>
diff --git a/frontend/public/favicon.svg b/frontend/public/favicon.svg
index 6893eb1..3ec7371 100644
--- a/frontend/public/favicon.svg
+++ b/frontend/public/favicon.svg
@@ -1 +1,5 @@
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\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="16" fill="#0b0c0b"/>
+  <circle cx="16" cy="16" r="13" fill="none" stroke="#38403a"/>
+  <text x="16" y="21" fill="#7fc96b" font-family="system-ui, sans-serif" font-size="16" font-weight="600" text-anchor="middle">d</text>
+</svg>
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 982c73d..c38c1d3 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -1,8 +1,7 @@
-<script setup lang="ts"></script>
+<script setup lang="ts">
+import ChatView from './components/ChatView.vue'
+</script>
 
 <template>
-  <main>
-    <h1>discovery-by-llm</h1>
-    <p>Chat interface under construction.</p>
-  </main>
+  <ChatView />
 </template>
diff --git a/frontend/src/components/AppHeader.vue b/frontend/src/components/AppHeader.vue
new file mode 100644
index 0000000..58444a4
--- /dev/null
+++ b/frontend/src/components/AppHeader.vue
@@ -0,0 +1,140 @@
+<script setup lang="ts">
+import type { AppMode, AuthState } from '../lib/models'
+import AuthStatus from './AuthStatus.vue'
+
+defineProps<{
+  auth: AuthState
+  mode: AppMode | null
+  healthFailed: boolean
+}>()
+defineEmits<{ logout: []; toggleDev: [] }>()
+</script>
+
+<template>
+  <header class="header">
+    <div class="inner">
+      <div class="brand">
+        <span class="wordmark">discovery<span class="accent">-by-</span>llm</span>
+        <span class="kicker">proof of concept</span>
+      </div>
+      <div class="controls">
+        <span class="mode" :class="{ failed: healthFailed }">
+          {{ mode ? `${mode} mode` : healthFailed ? 'mode unavailable' : 'checking mode' }}
+        </span>
+        <AuthStatus :auth="auth" @logout="$emit('logout')" />
+        <button class="button" type="button" @click="$emit('toggleDev')">
+          Dev panel <span class="key">Ctrl+D</span>
+        </button>
+      </div>
+    </div>
+  </header>
+</template>
+
+<style scoped>
+.header {
+  z-index: 20;
+  flex: none;
+  padding: var(--s-5) var(--gutter);
+  background: var(--c-bg);
+  border-bottom: 1px solid var(--c-line);
+}
+
+.inner {
+  display: flex;
+  gap: var(--s-6);
+  align-items: center;
+  justify-content: space-between;
+  max-width: var(--measure);
+  margin: 0 auto;
+}
+
+.brand {
+  display: flex;
+  gap: var(--s-5);
+  align-items: baseline;
+  min-width: 0;
+}
+
+.wordmark {
+  font-family: var(--f-display);
+  font-size: var(--t-brand);
+  font-weight: 600;
+  letter-spacing: -0.02em;
+}
+
+.accent {
+  color: var(--c-accent);
+}
+
+.kicker,
+.mode,
+.button {
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+}
+
+.kicker {
+  color: var(--c-text-faint);
+  font-size: var(--t-caps);
+  letter-spacing: var(--ls-caps);
+  text-transform: uppercase;
+}
+
+.controls {
+  display: flex;
+  flex: none;
+  gap: var(--s-4);
+  align-items: center;
+  white-space: nowrap;
+}
+
+.mode {
+  color: var(--c-accent-soft);
+  text-transform: uppercase;
+}
+
+.mode.failed {
+  color: var(--c-error);
+}
+
+.button {
+  min-height: 31px;
+  padding: 6px 11px;
+  color: var(--c-text-muted);
+  cursor: pointer;
+  background: transparent;
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-md);
+}
+
+.button:hover {
+  color: var(--c-text);
+  border-color: var(--c-focus-border);
+}
+
+.key {
+  color: var(--c-text-ghost);
+}
+
+@media (max-width: 760px) {
+  .kicker,
+  .mode,
+  .key {
+    display: none;
+  }
+}
+
+@media (max-width: 560px) {
+  .button {
+    min-width: var(--tap-min);
+    min-height: var(--tap-min);
+    padding: 8px;
+    font-size: 0;
+  }
+
+  .button::after {
+    content: 'Dev';
+    font-size: var(--t-micro);
+  }
+}
+</style>
diff --git a/frontend/src/components/AssistantMessage.vue b/frontend/src/components/AssistantMessage.vue
new file mode 100644
index 0000000..1120133
--- /dev/null
+++ b/frontend/src/components/AssistantMessage.vue
@@ -0,0 +1,132 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import type { AssistantTurn } from '../lib/models'
+import EmptyResults from './EmptyResults.vue'
+import PlaylistError from './PlaylistError.vue'
+import PlaylistSaved from './PlaylistSaved.vue'
+import RequestMetadata from './RequestMetadata.vue'
+import ResultActions from './ResultActions.vue'
+import ResultSet from './ResultSet.vue'
+import StreamError from './StreamError.vue'
+import StreamWarning from './StreamWarning.vue'
+import ThinkingIndicator from './ThinkingIndicator.vue'
+
+const props = defineProps<{ turn: AssistantTurn; canSave: boolean }>()
+defineEmits<{ save: []; retry: [query: string] }>()
+
+const thinkingLabel = computed(() => {
+  if (props.turn.requestId === null) return 'Reading the request'
+  if (props.turn.tracks.length === 0) {
+    return props.turn.candidateCount === null
+      ? 'Checking candidates'
+      : `Checking ${props.turn.candidateCount} candidates`
+  }
+  return 'Streaming verified tracks'
+})
+
+const isEmptyResult = computed(
+  () =>
+    props.turn.status === 'done' &&
+    props.turn.completion?.track_count === 0 &&
+    props.turn.tracks.length === 0,
+)
+</script>
+
+<template>
+  <div class="assistant">
+    <div class="avatar" aria-hidden="true">d</div>
+    <div class="column">
+      <p v-if="turn.intentSummary" class="intent">{{ turn.intentSummary }}</p>
+
+      <ResultSet v-if="turn.tracks.length" :tracks="turn.tracks" />
+
+      <ThinkingIndicator v-if="turn.status === 'streaming'" :label="thinkingLabel" />
+
+      <StreamWarning
+        v-for="(warning, index) in turn.warnings"
+        :key="`${warning.code}-${index}`"
+        :warning="warning"
+      />
+
+      <StreamError
+        v-if="turn.error"
+        :code="turn.error.code"
+        :message="turn.error.message"
+        @retry="$emit('retry', turn.query)"
+      />
+      <StreamError
+        v-else-if="turn.transportFailure"
+        :code="turn.transportFailure.kind"
+        :message="turn.transportFailure.message"
+        @retry="$emit('retry', turn.query)"
+      />
+
+      <EmptyResults v-if="isEmptyResult" />
+      <RequestMetadata :turn="turn" />
+
+      <ResultActions
+        v-if="turn.status === 'done' && turn.tracks.length && turn.playlist.status !== 'saved'"
+        :state="turn.playlist"
+        :track-count="turn.tracks.length"
+        :can-save="canSave"
+        @save="$emit('save')"
+      />
+      <PlaylistError
+        v-if="turn.playlist.status === 'error' && turn.playlist.message"
+        :message="turn.playlist.message"
+      />
+      <PlaylistSaved
+        v-if="turn.playlist.status === 'saved' && turn.playlist.name && turn.playlist.url"
+        :name="turn.playlist.name"
+        :url="turn.playlist.url"
+        :track-count="turn.tracks.length"
+      />
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.assistant {
+  display: flex;
+  gap: var(--s-5);
+}
+
+.avatar {
+  display: grid;
+  flex: none;
+  place-items: center;
+  width: 26px;
+  height: 26px;
+  margin-top: 1px;
+  color: var(--c-accent);
+  font-family: var(--f-display);
+  font-size: 13px;
+  font-weight: 600;
+  border: 1px solid var(--c-line);
+  border-radius: 50%;
+}
+
+.column {
+  display: flex;
+  flex: 1;
+  flex-direction: column;
+  gap: var(--s-7);
+  min-width: 0;
+}
+
+.intent {
+  margin: 0;
+  font-size: var(--t-lead);
+  text-wrap: pretty;
+}
+
+@media (max-width: 560px) {
+  .assistant {
+    gap: 0;
+  }
+
+  .avatar {
+    display: none;
+  }
+}
+</style>
diff --git a/frontend/src/components/AuthStatus.vue b/frontend/src/components/AuthStatus.vue
new file mode 100644
index 0000000..70d2bbc
--- /dev/null
+++ b/frontend/src/components/AuthStatus.vue
@@ -0,0 +1,128 @@
+<script setup lang="ts">
+import type { AuthState } from '../lib/models'
+
+defineProps<{ auth: AuthState }>()
+defineEmits<{ logout: [] }>()
+</script>
+
+<template>
+  <span
+    v-if="auth.status === 'checking'"
+    class="checking"
+    aria-label="Checking Spotify connection"
+  />
+  <a v-else-if="auth.status === 'anonymous'" class="button" href="/api/auth/login">
+    <span class="full-label">Connect Spotify</span><span class="short-label">Connect</span>
+  </a>
+  <span v-else-if="auth.status === 'failed'" class="failed" role="alert">
+    <span class="failure-message">{{ auth.message }}</span>
+    <a class="button" href="/api/auth/login">
+      <span class="full-label">Try Spotify again</span><span class="short-label">Retry</span>
+    </a>
+  </span>
+  <span v-else class="authenticated">
+    <span class="user">
+      <span class="dot" aria-hidden="true" />
+      <span class="connected">Connected as </span>{{ auth.user.display_name }}
+    </span>
+    <button
+      class="button"
+      type="button"
+      :disabled="auth.status === 'logging_out'"
+      @click="$emit('logout')"
+    >
+      {{ auth.status === 'logging_out' ? 'Logging out...' : 'Log out' }}
+    </button>
+  </span>
+</template>
+
+<style scoped>
+.checking {
+  width: 116px;
+  height: 31px;
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-pill);
+  opacity: 0.55;
+}
+
+.authenticated,
+.failed {
+  display: inline-flex;
+  gap: var(--s-3);
+  align-items: center;
+}
+
+.user {
+  display: inline-flex;
+  gap: 7px;
+  align-items: center;
+  padding: 5px 11px;
+  color: var(--c-text-muted);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-pill);
+}
+
+.dot {
+  width: 6px;
+  height: 6px;
+  background: var(--c-accent);
+  border-radius: 50%;
+}
+
+.failure-message {
+  max-width: 24ch;
+  color: var(--c-error);
+  font-size: var(--t-micro);
+  white-space: normal;
+}
+
+.button {
+  display: inline-flex;
+  flex: none;
+  align-items: center;
+  min-height: 31px;
+  padding: 6px 11px;
+  color: var(--c-text-muted);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+  white-space: nowrap;
+  cursor: pointer;
+  background: transparent;
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-md);
+}
+
+.short-label {
+  display: none;
+}
+
+.button:hover {
+  color: var(--c-text);
+  text-decoration: none;
+  border-color: var(--c-focus-border);
+}
+
+@media (max-width: 760px) {
+  .user,
+  .failure-message {
+    display: none;
+  }
+}
+
+@media (max-width: 560px) {
+  .checking,
+  .button {
+    min-height: var(--tap-min);
+  }
+
+  .full-label {
+    display: none;
+  }
+
+  .short-label {
+    display: inline;
+  }
+}
+</style>
diff --git a/frontend/src/components/ChatView.vue b/frontend/src/components/ChatView.vue
new file mode 100644
index 0000000..28eac2e
--- /dev/null
+++ b/frontend/src/components/ChatView.vue
@@ -0,0 +1,123 @@
+<script setup lang="ts">
+import { computed, nextTick, onMounted, onUnmounted, ref } from 'vue'
+import { useApi } from '../composables/useApi'
+import { useChatStream } from '../composables/useChatStream'
+import { DISCOVERY_SUGGESTIONS } from '../lib/suggestions'
+import AppHeader from './AppHeader.vue'
+import DevPanel from './DevPanel.vue'
+import MessageInput from './MessageInput.vue'
+import MessageList from './MessageList.vue'
+import ModeBanner from './ModeBanner.vue'
+
+const draft = ref('')
+const devOpen = ref(false)
+const input = ref<InstanceType<typeof MessageInput> | null>(null)
+const { auth, health, bootstrap, logout, createPlaylist } = useApi()
+const { turns, eventLog, isStreaming, turnCount, latestAssistant, send, savePlaylist, reset } =
+  useChatStream(createPlaylist)
+
+const mode = computed(() => (health.value.status === 'ready' ? health.value.mode : null))
+const canSave = computed(() => auth.value.status === 'authenticated')
+const turnCounter = computed(() => {
+  if (turnCount.value === 0) return 'no turns yet'
+  return `${turnCount.value} ${turnCount.value === 1 ? 'turn' : 'turns'} in this session`
+})
+
+async function focusInput(): Promise<void> {
+  await nextTick()
+  input.value?.focus()
+}
+
+function pickSuggestion(suggestion: string): void {
+  draft.value = suggestion
+  void focusInput()
+}
+
+function retryQuery(query: string): void {
+  draft.value = query
+  void focusInput()
+}
+
+function submit(query: string): void {
+  if (isStreaming.value) return
+  draft.value = ''
+  void send(query)
+}
+
+function onShortcut(event: KeyboardEvent): void {
+  if (event.ctrlKey && event.key.toLowerCase() === 'd') {
+    event.preventDefault()
+    devOpen.value = !devOpen.value
+  }
+}
+
+onMounted(() => {
+  void bootstrap()
+  window.addEventListener('keydown', onShortcut)
+})
+
+onUnmounted(() => window.removeEventListener('keydown', onShortcut))
+</script>
+
+<template>
+  <div class="chat-view">
+    <div class="shell" :inert="devOpen">
+      <AppHeader
+        :auth="auth"
+        :mode="mode"
+        :health-failed="health.status === 'failed'"
+        @logout="logout"
+        @toggle-dev="devOpen = true"
+      />
+
+      <ModeBanner v-if="mode === 'demo'" />
+
+      <MessageList
+        :turns="turns"
+        :suggestions="DISCOVERY_SUGGESTIONS"
+        :can-save="canSave"
+        @pick="pickSuggestion"
+        @save="savePlaylist"
+        @retry="retryQuery"
+      />
+
+      <MessageInput
+        ref="input"
+        v-model="draft"
+        :disabled="isStreaming"
+        :turn-counter="turnCounter"
+        @send="submit"
+      />
+    </div>
+
+    <DevPanel
+      v-if="devOpen"
+      :latest="latestAssistant"
+      :log="eventLog"
+      @close="devOpen = false"
+      @reset="reset"
+    />
+  </div>
+</template>
+
+<style scoped>
+.chat-view,
+.shell {
+  width: 100%;
+  height: 100dvh;
+  overflow: hidden;
+}
+
+.chat-view {
+  color: var(--c-text);
+  font-family: var(--f-body);
+  font-size: var(--t-body);
+  line-height: var(--lh-body);
+  background: var(--c-bg);
+}
+
+.shell {
+  display: flex;
+  flex-direction: column;
+}
+</style>
diff --git a/frontend/src/components/DevPanel.vue b/frontend/src/components/DevPanel.vue
new file mode 100644
index 0000000..a15afd0
--- /dev/null
+++ b/frontend/src/components/DevPanel.vue
@@ -0,0 +1,285 @@
+<script setup lang="ts">
+import { computed, nextTick, onMounted, onUnmounted, ref } from 'vue'
+import type { AssistantTurn, EventLogEntry } from '../lib/models'
+
+const props = defineProps<{
+  latest: AssistantTurn | undefined
+  log: EventLogEntry[]
+}>()
+const emit = defineEmits<{ close: []; reset: [] }>()
+
+const panel = ref<HTMLElement | null>(null)
+const closeButton = ref<HTMLButtonElement | null>(null)
+let returnFocus: HTMLElement | null = null
+
+const rows = computed(() => [
+  { label: 'request id', value: props.latest?.requestId ?? 'waiting' },
+  {
+    label: 'candidate count',
+    value: props.latest?.candidateCount?.toString() ?? 'waiting',
+  },
+  {
+    label: 'track count',
+    value:
+      props.latest?.completion?.track_count.toString() ??
+      props.latest?.tracks.length.toString() ??
+      'waiting',
+  },
+  {
+    label: 'total ms',
+    value: props.latest?.completion?.total_ms.toString() ?? 'waiting',
+  },
+])
+const entries = computed(() =>
+  props.log.length
+    ? [...props.log].reverse()
+    : [{ timestamp: '--:--:--', type: 'idle', detail: 'waiting for a request' }],
+)
+
+function focusableElements(): HTMLElement[] {
+  if (!panel.value) return []
+  return Array.from(
+    panel.value.querySelectorAll<HTMLElement>(
+      'button:not(:disabled), a[href], input:not(:disabled), [tabindex]:not([tabindex="-1"])',
+    ),
+  )
+}
+
+function onKeydown(event: KeyboardEvent): void {
+  if (event.key === 'Escape') {
+    event.preventDefault()
+    emit('close')
+    return
+  }
+  if (event.key !== 'Tab') return
+
+  const focusable = focusableElements()
+  if (!focusable.length) return
+  const first = focusable[0]
+  const last = focusable[focusable.length - 1]
+  if (event.shiftKey && document.activeElement === first) {
+    event.preventDefault()
+    last?.focus()
+  } else if (!event.shiftKey && document.activeElement === last) {
+    event.preventDefault()
+    first?.focus()
+  }
+}
+
+onMounted(async () => {
+  returnFocus = document.activeElement instanceof HTMLElement ? document.activeElement : null
+  await nextTick()
+  closeButton.value?.focus()
+})
+
+onUnmounted(() => returnFocus?.focus())
+</script>
+
+<template>
+  <div class="backdrop" @click.self="$emit('close')">
+    <aside
+      ref="panel"
+      class="panel"
+      role="dialog"
+      aria-modal="true"
+      aria-labelledby="dev-panel-title"
+      @keydown="onKeydown"
+    >
+      <div class="bar">
+        <h2 id="dev-panel-title" class="caps">Dev panel</h2>
+        <button
+          ref="closeButton"
+          class="close"
+          type="button"
+          aria-label="Close dev panel"
+          @click="$emit('close')"
+        >
+          <span aria-hidden="true">X</span>
+        </button>
+      </div>
+      <div class="body">
+        <section>
+          <h3 class="caps">Latest request</h3>
+          <p class="caption">Only counters supplied by the recommendation contract are shown.</p>
+          <div class="table">
+            <div v-for="row in rows" :key="row.label" class="row">
+              <span class="key">{{ row.label }}</span
+              ><span class="value">{{ row.value }}</span>
+            </div>
+          </div>
+        </section>
+        <section>
+          <h3 class="caps section-heading">Conversation</h3>
+          <button class="reset" type="button" @click="$emit('reset')">Clear conversation</button>
+        </section>
+        <section>
+          <h3 class="caps section-heading">Event stream</h3>
+          <div class="log">
+            <div v-for="(entry, index) in entries" :key="index" class="entry">
+              <span class="time">{{ entry.timestamp }}</span>
+              <span class="type">{{ entry.type }}</span>
+              <span class="detail" :title="entry.detail">{{ entry.detail }}</span>
+            </div>
+          </div>
+        </section>
+      </div>
+    </aside>
+  </div>
+</template>
+
+<style scoped>
+.backdrop {
+  position: fixed;
+  inset: 0;
+  z-index: 40;
+  background: rgba(0, 0, 0, 0.5);
+}
+
+.panel {
+  position: absolute;
+  inset: 0 0 0 auto;
+  display: flex;
+  flex-direction: column;
+  width: var(--dev-width);
+  max-width: 100vw;
+  overflow-y: auto;
+  background: var(--c-dev-bg);
+  border-left: 1px solid var(--c-line);
+  box-shadow: var(--shadow-drawer);
+}
+
+.bar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: var(--s-6) var(--s-7);
+  border-bottom: 1px solid var(--c-line);
+}
+
+.caps {
+  margin: 0;
+  color: var(--c-text-muted);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+  font-weight: 400;
+  letter-spacing: var(--ls-caps);
+  text-transform: uppercase;
+}
+
+.section-heading {
+  margin-bottom: var(--s-4);
+}
+
+.close {
+  min-width: var(--tap-min);
+  min-height: var(--tap-min);
+  color: var(--c-text-faint);
+  font-family: var(--f-mono);
+  font-size: var(--t-body);
+  line-height: 1;
+  cursor: pointer;
+  background: none;
+  border: 0;
+}
+
+.body {
+  display: flex;
+  flex-direction: column;
+  gap: var(--s-8);
+  padding: var(--s-7);
+}
+
+.caption {
+  margin: var(--s-1) 0 var(--s-5);
+  color: var(--c-text-dim);
+  font-size: 12.5px;
+}
+
+.table {
+  display: flex;
+  flex-direction: column;
+  gap: 1px;
+  overflow: hidden;
+  background: var(--c-line);
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-md);
+}
+
+.row {
+  display: flex;
+  gap: var(--s-5);
+  justify-content: space-between;
+  padding: 9px var(--s-5);
+  font-family: var(--f-mono);
+  font-size: var(--t-meta);
+  background: var(--c-surface);
+}
+
+.key {
+  color: var(--c-text-dim);
+}
+
+.value {
+  max-width: 55%;
+  overflow: hidden;
+  color: var(--c-text);
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.reset {
+  width: 100%;
+  min-height: var(--tap-min);
+  padding: 11px var(--s-5);
+  color: var(--c-text-chip);
+  font-size: 13px;
+  text-align: left;
+  cursor: pointer;
+  background: var(--c-surface);
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-md);
+}
+
+.reset:hover {
+  color: var(--c-text);
+  border-color: var(--c-accent);
+}
+
+.log {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  max-height: 260px;
+  overflow-y: auto;
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+}
+
+.entry {
+  display: grid;
+  grid-template-columns: auto auto minmax(0, 1fr);
+  gap: var(--s-4);
+}
+
+.time {
+  color: var(--c-text-ghost);
+}
+
+.type {
+  color: var(--c-accent);
+}
+
+.detail {
+  min-width: 0;
+  overflow: hidden;
+  color: var(--c-text-dim);
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+@media (max-width: 560px) {
+  .panel {
+    width: 100vw;
+  }
+}
+</style>
diff --git a/frontend/src/components/EmptyResults.vue b/frontend/src/components/EmptyResults.vue
new file mode 100644
index 0000000..a46ef54
--- /dev/null
+++ b/frontend/src/components/EmptyResults.vue
@@ -0,0 +1,28 @@
+<template>
+  <div class="empty-results">
+    <strong>No verified tracks matched this request.</strong>
+    <span>Try broadening the moment or removing one constraint.</span>
+  </div>
+</template>
+
+<style scoped>
+.empty-results {
+  display: flex;
+  flex-direction: column;
+  gap: var(--s-1);
+  padding: var(--s-6);
+  color: var(--c-text-muted);
+  background: var(--c-surface);
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-md);
+}
+
+.empty-results strong {
+  color: var(--c-text);
+  font-weight: 500;
+}
+
+.empty-results span {
+  font-size: var(--t-small);
+}
+</style>
diff --git a/frontend/src/components/EmptyState.vue b/frontend/src/components/EmptyState.vue
new file mode 100644
index 0000000..a16e32a
--- /dev/null
+++ b/frontend/src/components/EmptyState.vue
@@ -0,0 +1,72 @@
+<script setup lang="ts">
+import SuggestionChips from './SuggestionChips.vue'
+
+defineProps<{ suggestions: readonly string[] }>()
+defineEmits<{ pick: [suggestion: string] }>()
+</script>
+
+<template>
+  <div class="empty">
+    <h1>What should be playing<span class="accent"> right now?</span></h1>
+    <p class="lede">
+      Describe the moment, not the genre. The assistant reads the request, proposes candidates,
+      verifies each one on Spotify and explains why it picked them.
+    </p>
+    <template v-if="suggestions.length">
+      <div class="label">Try one of these</div>
+      <SuggestionChips :suggestions="suggestions" @pick="$emit('pick', $event)" />
+    </template>
+  </div>
+</template>
+
+<style scoped>
+.empty {
+  padding: var(--s-5) 0 var(--s-3);
+}
+
+h1 {
+  max-width: 16ch;
+  margin: 0 0 var(--s-5);
+  font-family: var(--f-display);
+  font-size: var(--t-hero);
+  font-weight: 600;
+  line-height: var(--lh-hero);
+  letter-spacing: var(--ls-hero);
+}
+
+.accent {
+  color: var(--c-accent);
+}
+
+.lede {
+  max-width: 52ch;
+  margin: 0 0 var(--s-9);
+  color: var(--c-text-muted);
+  text-wrap: pretty;
+}
+
+.label {
+  margin-bottom: var(--s-5);
+  color: var(--c-text-faint);
+  font-family: var(--f-mono);
+  font-size: var(--t-caps);
+  letter-spacing: var(--ls-caps);
+  text-transform: uppercase;
+}
+
+@media (max-width: 760px) {
+  h1 {
+    font-size: 38px;
+  }
+}
+
+@media (max-width: 560px) {
+  .empty {
+    padding-top: var(--s-1);
+  }
+
+  h1 {
+    font-size: 32px;
+  }
+}
+</style>
diff --git a/frontend/src/components/MessageInput.vue b/frontend/src/components/MessageInput.vue
new file mode 100644
index 0000000..f44c61b
--- /dev/null
+++ b/frontend/src/components/MessageInput.vue
@@ -0,0 +1,139 @@
+<script setup lang="ts">
+import { computed, onMounted, onUnmounted, ref } from 'vue'
+
+const model = defineModel<string>({ required: true })
+const props = defineProps<{ disabled: boolean; turnCounter: string }>()
+const emit = defineEmits<{ send: [query: string] }>()
+
+const input = ref<HTMLInputElement | null>(null)
+const narrow = ref(false)
+const placeholder = 'Describe the moment: "something calm while I am programming, but not boring"'
+let mediaQuery: MediaQueryList | null = null
+
+const sendDisabled = computed(() => props.disabled || model.value.trim().length === 0)
+
+function updateWidth(event?: MediaQueryListEvent): void {
+  narrow.value = event?.matches ?? mediaQuery?.matches ?? false
+}
+
+function submit(event?: KeyboardEvent): void {
+  if (event?.isComposing || props.disabled) return
+  const query = model.value.trim()
+  if (query) emit('send', query)
+}
+
+function focus(): void {
+  input.value?.focus()
+}
+
+onMounted(() => {
+  mediaQuery = window.matchMedia('(max-width: 559px)')
+  updateWidth()
+  mediaQuery.addEventListener('change', updateWidth)
+})
+
+onUnmounted(() => mediaQuery?.removeEventListener('change', updateWidth))
+defineExpose({ focus })
+</script>
+
+<template>
+  <div class="composer">
+    <div class="inner">
+      <div class="field">
+        <input
+          ref="input"
+          v-model="model"
+          aria-label="Describe what you want to listen to"
+          :placeholder="narrow ? 'Describe the moment...' : placeholder"
+          @keydown.enter.prevent="submit($event)"
+        />
+        <button class="send" type="button" :disabled="sendDisabled" @click="submit()">
+          {{ disabled ? 'Working...' : 'Send' }}
+        </button>
+      </div>
+      <div class="hints">
+        <span class="hint">
+          Enter to send / refine with follow-ups like "more electronic and drop number 3"
+        </span>
+        <span>{{ turnCounter }}</span>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.composer {
+  flex: none;
+  padding: var(--s-5) var(--gutter) calc(20px + env(safe-area-inset-bottom));
+  background: var(--c-bg);
+  border-top: 1px solid var(--c-line);
+}
+
+.inner {
+  max-width: var(--measure);
+  margin: 0 auto;
+}
+
+.field {
+  display: flex;
+  gap: var(--s-4);
+  align-items: flex-end;
+  padding: var(--s-3) var(--s-3) var(--s-3) var(--s-6);
+  background: var(--c-surface);
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-lg);
+  transition: border-color var(--dur-fast) ease;
+}
+
+.field:focus-within {
+  border-color: var(--c-focus-border);
+}
+
+input {
+  flex: 1;
+  min-width: 0;
+  padding: var(--s-3) 0;
+  color: var(--c-text);
+  background: transparent;
+  border: 0;
+  outline: none;
+}
+
+input::placeholder {
+  color: var(--c-text-faint);
+}
+
+.send {
+  flex: none;
+  min-height: var(--tap-min);
+  padding: var(--s-4) var(--s-7);
+  color: var(--c-on-accent);
+  font-size: 14px;
+  font-weight: 500;
+  cursor: pointer;
+  background: var(--c-accent);
+  border: 0;
+  border-radius: var(--r-md);
+  transition: background var(--dur-fast) ease;
+}
+
+.send:hover:not(:disabled) {
+  background: var(--c-accent-hover);
+}
+
+.hints {
+  display: flex;
+  gap: var(--s-6);
+  justify-content: space-between;
+  margin-top: 9px;
+  color: var(--c-text-ghost);
+  font-family: var(--f-mono);
+  font-size: 10.5px;
+}
+
+@media (max-width: 760px) {
+  .hint {
+    display: none;
+  }
+}
+</style>
diff --git a/frontend/src/components/MessageList.vue b/frontend/src/components/MessageList.vue
new file mode 100644
index 0000000..e52a7cf
--- /dev/null
+++ b/frontend/src/components/MessageList.vue
@@ -0,0 +1,130 @@
+<script setup lang="ts">
+import { computed, nextTick, ref, watch } from 'vue'
+import type { AssistantTurn, ChatTurn } from '../lib/models'
+import AssistantMessage from './AssistantMessage.vue'
+import EmptyState from './EmptyState.vue'
+import UserMessage from './UserMessage.vue'
+
+const props = defineProps<{
+  turns: ChatTurn[]
+  suggestions: readonly string[]
+  canSave: boolean
+}>()
+defineEmits<{
+  pick: [suggestion: string]
+  save: [turnId: string]
+  retry: [query: string]
+}>()
+
+const list = ref<HTMLElement | null>(null)
+const pinned = ref(true)
+const fingerprint = computed(() =>
+  props.turns
+    .map((turn) =>
+      turn.role === 'user'
+        ? turn.id
+        : `${turn.id}:${turn.tracks.length}:${turn.warnings.length}:${turn.status}`,
+    )
+    .join('|'),
+)
+const streaming = computed(() =>
+  props.turns.some((turn) => turn.role === 'assistant' && turn.status === 'streaming'),
+)
+const latestAssistant = computed(() =>
+  [...props.turns].reverse().find((turn): turn is AssistantTurn => turn.role === 'assistant'),
+)
+const announcement = computed(() => {
+  const turn = latestAssistant.value
+  if (!turn) return ''
+  if (turn.status === 'error') return 'The recommendation request failed.'
+  if (turn.status === 'done') {
+    return `${turn.completion?.track_count ?? turn.tracks.length} tracks ready.`
+  }
+  if (turn.requestId === null) return 'Reading the request.'
+  if (turn.tracks.length === 0) return 'Checking recommendation candidates.'
+  return `${turn.tracks.length} verified tracks received.`
+})
+
+function onScroll(): void {
+  const element = list.value
+  if (!element) return
+  pinned.value = element.scrollHeight - element.scrollTop - element.clientHeight < 48
+}
+
+async function scrollToLatest(): Promise<void> {
+  if (!pinned.value) return
+  await nextTick()
+  requestAnimationFrame(() => {
+    if (list.value) list.value.scrollTop = list.value.scrollHeight
+  })
+}
+
+watch(fingerprint, scrollToLatest, { flush: 'post' })
+watch(streaming, (value) => {
+  if (value) pinned.value = true
+})
+</script>
+
+<template>
+  <main ref="list" class="list" aria-label="Conversation" @scroll="onScroll">
+    <p class="visually-hidden" aria-live="polite" aria-atomic="true">
+      {{ announcement }}
+    </p>
+    <div class="column">
+      <EmptyState
+        v-if="turns.length === 0"
+        :suggestions="suggestions"
+        @pick="$emit('pick', $event)"
+      />
+      <div v-for="turn in turns" :key="turn.id" class="turn">
+        <UserMessage v-if="turn.role === 'user'" :text="turn.text" />
+        <AssistantMessage
+          v-else
+          :turn="turn"
+          :can-save="canSave"
+          @save="$emit('save', turn.id)"
+          @retry="$emit('retry', $event)"
+        />
+      </div>
+    </div>
+  </main>
+</template>
+
+<style scoped>
+.list {
+  flex: 1 1 auto;
+  min-height: 0;
+  padding: 32px var(--gutter) 28px;
+  overflow-y: auto;
+}
+
+.column {
+  display: flex;
+  flex-direction: column;
+  gap: var(--s-9);
+  max-width: var(--measure);
+  margin: 0 auto;
+}
+
+.turn {
+  animation: message-in 0.3s ease both;
+}
+
+@keyframes message-in {
+  from {
+    opacity: 0;
+    transform: translateY(6px);
+  }
+
+  to {
+    opacity: 1;
+    transform: none;
+  }
+}
+
+@media (max-width: 560px) {
+  .list {
+    padding-top: 24px;
+  }
+}
+</style>
diff --git a/frontend/src/components/ModeBanner.vue b/frontend/src/components/ModeBanner.vue
new file mode 100644
index 0000000..4b79150
--- /dev/null
+++ b/frontend/src/components/ModeBanner.vue
@@ -0,0 +1,36 @@
+<template>
+  <div class="banner" role="status">
+    <div class="inner">
+      <span class="dot" aria-hidden="true" />
+      <span>Demo mode: replaying recorded recommendation sessions</span>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.banner {
+  flex: none;
+  padding: 9px var(--gutter);
+  background: var(--c-banner-bg);
+  border-bottom: 1px solid var(--c-banner-line);
+}
+
+.inner {
+  display: flex;
+  gap: var(--s-5);
+  align-items: center;
+  max-width: var(--measure);
+  margin: 0 auto;
+  color: var(--c-accent-soft);
+  font-family: var(--f-mono);
+  font-size: var(--t-meta);
+}
+
+.dot {
+  flex: none;
+  width: 6px;
+  height: 6px;
+  background: var(--c-accent);
+  border-radius: 50%;
+}
+</style>
diff --git a/frontend/src/components/PlaylistError.vue b/frontend/src/components/PlaylistError.vue
new file mode 100644
index 0000000..ea5829a
--- /dev/null
+++ b/frontend/src/components/PlaylistError.vue
@@ -0,0 +1,17 @@
+<script setup lang="ts">
+defineProps<{ message: string }>()
+</script>
+
+<template>
+  <p class="error" role="alert">{{ message }}</p>
+</template>
+
+<style scoped>
+.error {
+  margin: 0;
+  padding-left: var(--s-5);
+  color: var(--c-error);
+  font-size: var(--t-small);
+  border-left: 2px solid var(--c-error);
+}
+</style>
diff --git a/frontend/src/components/PlaylistSaved.vue b/frontend/src/components/PlaylistSaved.vue
new file mode 100644
index 0000000..cfe49ec
--- /dev/null
+++ b/frontend/src/components/PlaylistSaved.vue
@@ -0,0 +1,64 @@
+<script setup lang="ts">
+defineProps<{ name: string; url: string; trackCount: number }>()
+</script>
+
+<template>
+  <div class="saved" role="status">
+    <div>
+      <div class="line">
+        Saved <span class="name">{{ name }}</span>
+      </div>
+      <div class="meta">{{ trackCount }} tracks / private / created just now</div>
+    </div>
+    <a class="link" :href="url" target="_blank" rel="noreferrer">
+      Open in Spotify <span aria-hidden="true">&nearr;</span>
+    </a>
+  </div>
+</template>
+
+<style scoped>
+.saved {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--s-6);
+  align-items: center;
+  justify-content: space-between;
+  padding: 13px var(--s-6);
+  background: var(--c-saved-bg);
+  border: 1px solid var(--c-saved-line);
+  border-radius: var(--r-md);
+  animation: save-pop 0.26s ease both;
+}
+
+.line {
+  font-size: 14.5px;
+}
+
+.name,
+.link {
+  color: var(--c-saved);
+}
+
+.meta,
+.link {
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+}
+
+.meta {
+  margin-top: 2px;
+  color: var(--c-text-faint);
+}
+
+@keyframes save-pop {
+  from {
+    opacity: 0;
+    transform: scale(0.97);
+  }
+
+  to {
+    opacity: 1;
+    transform: none;
+  }
+}
+</style>
diff --git a/frontend/src/components/RequestMetadata.vue b/frontend/src/components/RequestMetadata.vue
new file mode 100644
index 0000000..1ea7397
--- /dev/null
+++ b/frontend/src/components/RequestMetadata.vue
@@ -0,0 +1,30 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import type { AssistantTurn } from '../lib/models'
+
+const props = defineProps<{ turn: AssistantTurn }>()
+const parts = computed(() => {
+  const values: string[] = []
+  if (props.turn.candidateCount !== null) {
+    values.push(`${props.turn.candidateCount} candidates considered`)
+  }
+  if (props.turn.completion) {
+    values.push(`${props.turn.completion.track_count} verified`)
+    values.push(`${props.turn.completion.total_ms} ms`)
+  }
+  return values
+})
+</script>
+
+<template>
+  <p v-if="parts.length" class="metadata">{{ parts.join(' / ') }}</p>
+</template>
+
+<style scoped>
+.metadata {
+  margin: 0;
+  color: var(--c-text-ghost);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+}
+</style>
diff --git a/frontend/src/components/ResultActions.vue b/frontend/src/components/ResultActions.vue
new file mode 100644
index 0000000..f8e5209
--- /dev/null
+++ b/frontend/src/components/ResultActions.vue
@@ -0,0 +1,74 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import type { PlaylistState } from '../lib/models'
+
+const props = defineProps<{
+  state: PlaylistState
+  trackCount: number
+  canSave: boolean
+}>()
+defineEmits<{ save: [] }>()
+
+const buttonLabel = computed(() => {
+  if (props.state.status === 'saving') return 'Saving...'
+  if (props.state.status === 'error') return 'Try saving again'
+  return 'Save as playlist'
+})
+</script>
+
+<template>
+  <div class="actions">
+    <button
+      v-if="canSave"
+      class="save"
+      type="button"
+      :disabled="state.status === 'saving'"
+      @click="$emit('save')"
+    >
+      {{ buttonLabel }}
+    </button>
+    <a v-else class="connect" href="/api/auth/login">Connect Spotify to save</a>
+    <span class="summary">{{ trackCount }} verified tracks ready for a private playlist</span>
+  </div>
+</template>
+
+<style scoped>
+.actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--s-5);
+  align-items: center;
+}
+
+.save,
+.connect {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-height: var(--tap-min);
+  padding: 11px var(--s-6);
+  color: var(--c-on-accent);
+  font-size: var(--t-small);
+  font-weight: 500;
+  text-decoration: none;
+  cursor: pointer;
+  background: var(--c-accent);
+  border: 1px solid var(--c-accent);
+  border-radius: var(--r-md);
+  transition: all var(--dur-fast) ease;
+}
+
+.save:hover,
+.connect:hover {
+  color: var(--c-on-accent);
+  text-decoration: none;
+  background: var(--c-accent-hover);
+  border-color: var(--c-accent-hover);
+}
+
+.summary {
+  color: var(--c-text-faint);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+}
+</style>
diff --git a/frontend/src/components/ResultSet.vue b/frontend/src/components/ResultSet.vue
new file mode 100644
index 0000000..42f7c31
--- /dev/null
+++ b/frontend/src/components/ResultSet.vue
@@ -0,0 +1,20 @@
+<script setup lang="ts">
+import type { TrackEvent } from '../lib/types'
+import TrackCard from './TrackCard.vue'
+
+defineProps<{ tracks: TrackEvent[] }>()
+</script>
+
+<template>
+  <div class="set" aria-label="Recommended tracks">
+    <TrackCard v-for="event in tracks" :key="event.track.id" :event="event" />
+  </div>
+</template>
+
+<style scoped>
+.set {
+  display: flex;
+  flex-direction: column;
+  gap: var(--s-2);
+}
+</style>
diff --git a/frontend/src/components/StreamError.vue b/frontend/src/components/StreamError.vue
new file mode 100644
index 0000000..fa27e79
--- /dev/null
+++ b/frontend/src/components/StreamError.vue
@@ -0,0 +1,37 @@
+<script setup lang="ts">
+defineProps<{ code: string; message: string }>()
+defineEmits<{ retry: [] }>()
+</script>
+
+<template>
+  <div class="error" role="alert" :data-error-code="code">
+    <p>{{ message }}</p>
+    <button type="button" @click="$emit('retry')">Edit and retry</button>
+  </div>
+</template>
+
+<style scoped>
+.error {
+  padding-left: var(--s-5);
+  color: var(--c-error);
+  border-left: 2px solid var(--c-error);
+}
+
+.error p {
+  margin: 0;
+  text-wrap: pretty;
+}
+
+.error button {
+  min-height: var(--tap-min);
+  margin-top: var(--s-3);
+  padding: 8px var(--s-4);
+  color: var(--c-error);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+  background: transparent;
+  border: 1px solid currentcolor;
+  border-radius: var(--r-md);
+  cursor: pointer;
+}
+</style>
diff --git a/frontend/src/components/StreamWarning.vue b/frontend/src/components/StreamWarning.vue
new file mode 100644
index 0000000..4fec607
--- /dev/null
+++ b/frontend/src/components/StreamWarning.vue
@@ -0,0 +1,20 @@
+<script setup lang="ts">
+import type { WarningEvent } from '../lib/types'
+
+defineProps<{ warning: WarningEvent }>()
+</script>
+
+<template>
+  <p class="warning" :data-warning-code="warning.code">{{ warning.message }}</p>
+</template>
+
+<style scoped>
+.warning {
+  margin: 0;
+  padding-left: var(--s-5);
+  color: var(--c-accent-soft);
+  font-size: var(--t-small);
+  text-wrap: pretty;
+  border-left: 2px solid var(--c-accent-line);
+}
+</style>
diff --git a/frontend/src/components/SuggestionChips.vue b/frontend/src/components/SuggestionChips.vue
new file mode 100644
index 0000000..3252a6b
--- /dev/null
+++ b/frontend/src/components/SuggestionChips.vue
@@ -0,0 +1,59 @@
+<script setup lang="ts">
+defineProps<{ suggestions: readonly string[] }>()
+defineEmits<{ pick: [suggestion: string] }>()
+</script>
+
+<template>
+  <div class="chips">
+    <button
+      v-for="suggestion in suggestions"
+      :key="suggestion"
+      class="chip"
+      type="button"
+      @click="$emit('pick', suggestion)"
+    >
+      {{ suggestion }}
+    </button>
+  </div>
+</template>
+
+<style scoped>
+.chips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--s-3);
+}
+
+.chip {
+  flex: none;
+  padding: var(--s-3) 15px;
+  color: var(--c-text-chip);
+  font-size: var(--t-small);
+  white-space: nowrap;
+  cursor: pointer;
+  background: var(--c-surface-raised);
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-pill);
+  transition: all var(--dur-fast) ease;
+}
+
+.chip:hover {
+  color: var(--c-text);
+  border-color: var(--c-accent);
+  transform: translateY(-1px);
+}
+
+@media (max-width: 560px) {
+  .chips {
+    flex-wrap: nowrap;
+    padding: 0 var(--gutter);
+    margin: 0 calc(-1 * var(--gutter));
+    overflow-x: auto;
+    scrollbar-width: none;
+  }
+
+  .chips::-webkit-scrollbar {
+    display: none;
+  }
+}
+</style>
diff --git a/frontend/src/components/ThinkingIndicator.vue b/frontend/src/components/ThinkingIndicator.vue
new file mode 100644
index 0000000..fd4c87c
--- /dev/null
+++ b/frontend/src/components/ThinkingIndicator.vue
@@ -0,0 +1,54 @@
+<script setup lang="ts">
+defineProps<{ label: string }>()
+</script>
+
+<template>
+  <div class="thinking" aria-hidden="true">
+    <span class="dot" /><span class="dot" /><span class="dot" />
+    <span class="label">{{ label }}</span>
+  </div>
+</template>
+
+<style scoped>
+.thinking {
+  display: flex;
+  align-items: center;
+  gap: var(--s-3);
+  color: var(--c-text-faint);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+  letter-spacing: 0.1em;
+  text-transform: uppercase;
+}
+
+.dot {
+  width: 5px;
+  height: 5px;
+  background: var(--c-accent);
+  border-radius: 50%;
+  animation: pulse-dot 1.1s infinite;
+}
+
+.dot:nth-child(2) {
+  animation-delay: 0.18s;
+}
+
+.dot:nth-child(3) {
+  animation-delay: 0.36s;
+}
+
+.label {
+  margin-left: var(--s-1);
+}
+
+@keyframes pulse-dot {
+  0%,
+  100% {
+    opacity: 0.25;
+  }
+
+  50% {
+    opacity: 1;
+  }
+}
+</style>
diff --git a/frontend/src/components/TrackCard.vue b/frontend/src/components/TrackCard.vue
new file mode 100644
index 0000000..52287b6
--- /dev/null
+++ b/frontend/src/components/TrackCard.vue
@@ -0,0 +1,169 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import type { TrackEvent } from '../lib/types'
+
+const props = defineProps<{ event: TrackEvent }>()
+const artworkFailed = ref(false)
+const artists = computed(() => props.event.track.artists.join(', '))
+</script>
+
+<template>
+  <article class="card">
+    <div class="rank">{{ event.rank }}</div>
+    <div class="art">
+      <img
+        v-if="event.track.album_art_url && !artworkFailed"
+        :src="event.track.album_art_url"
+        :alt="`${event.track.album_name} album artwork`"
+        @error="artworkFailed = true"
+      />
+    </div>
+    <div class="track-meta">
+      <div class="head">
+        <span class="title">{{ event.track.title }}</span>
+        <span class="artist">{{ artists }}</span>
+      </div>
+      <div class="album">{{ event.track.album_name }}</div>
+      <div class="why">{{ event.justification }}</div>
+    </div>
+    <a
+      v-if="event.track.external_url"
+      class="link"
+      :href="event.track.external_url"
+      target="_blank"
+      rel="noreferrer"
+    >
+      Open in Spotify
+      <span aria-hidden="true">&nearr;</span>
+    </a>
+  </article>
+</template>
+
+<style scoped>
+.card {
+  display: grid;
+  grid-template-columns: 26px 52px 1fr auto;
+  row-gap: var(--s-4);
+  column-gap: var(--s-6);
+  align-items: center;
+  padding: 11px var(--s-5);
+  background: var(--c-surface);
+  border: 1px solid var(--c-card-border);
+  border-radius: var(--r-md);
+  transition:
+    border-color var(--dur-fast) ease,
+    background var(--dur-fast) ease;
+  animation: card-in var(--dur-card) var(--ease) both;
+}
+
+.card:hover {
+  background: var(--c-surface-hover);
+  border-color: var(--c-line-strong);
+}
+
+.rank {
+  color: var(--c-text-faint);
+  font-family: var(--f-mono);
+  font-size: 12px;
+  text-align: right;
+}
+
+.art {
+  width: 52px;
+  height: 52px;
+  overflow: hidden;
+  background: repeating-linear-gradient(135deg, var(--c-art-a) 0 6px, var(--c-art-b) 6px 12px);
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-sm);
+}
+
+.art img {
+  display: block;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+
+.track-meta {
+  min-width: 0;
+}
+
+.head {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0 9px;
+  align-items: baseline;
+}
+
+.title {
+  font-size: var(--t-title);
+  font-weight: 500;
+}
+
+.artist,
+.album,
+.why {
+  color: var(--c-text-muted);
+  font-size: 13px;
+}
+
+.album {
+  margin-top: 1px;
+  color: var(--c-text-faint);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+}
+
+.why {
+  margin-top: 3px;
+  color: var(--c-text-dim);
+  font-size: var(--t-small);
+  text-wrap: pretty;
+}
+
+.link {
+  display: inline-flex;
+  gap: var(--s-1);
+  align-items: center;
+  justify-content: center;
+  justify-self: end;
+  padding: 6px var(--s-4);
+  color: var(--c-text-muted);
+  font-family: var(--f-mono);
+  font-size: var(--t-micro);
+  text-decoration: none;
+  white-space: nowrap;
+  border: 1px solid var(--c-line);
+  border-radius: var(--r-md);
+}
+
+.link:hover {
+  color: var(--c-accent);
+  text-decoration: none;
+  border-color: var(--c-accent);
+}
+
+@keyframes card-in {
+  from {
+    opacity: 0;
+    transform: translateY(10px);
+  }
+
+  to {
+    opacity: 1;
+    transform: none;
+  }
+}
+
+@media (max-width: 560px) {
+  .card {
+    grid-template-columns: 26px 52px 1fr;
+  }
+
+  .link {
+    grid-column: 1 / -1;
+    justify-self: stretch;
+    min-height: var(--tap-min);
+  }
+}
+</style>
diff --git a/frontend/src/components/UserMessage.vue b/frontend/src/components/UserMessage.vue
new file mode 100644
index 0000000..c04cc0a
--- /dev/null
+++ b/frontend/src/components/UserMessage.vue
@@ -0,0 +1,26 @@
+<script setup lang="ts">
+defineProps<{ text: string }>()
+</script>
+
+<template>
+  <div class="row">
+    <div class="bubble">{{ text }}</div>
+  </div>
+</template>
+
+<style scoped>
+.row {
+  display: flex;
+  justify-content: flex-end;
+}
+
+.bubble {
+  max-width: 78%;
+  padding: 11px var(--s-6);
+  color: var(--c-text);
+  overflow-wrap: anywhere;
+  background: var(--c-surface-user);
+  border: 1px solid var(--c-line-user);
+  border-radius: var(--r-md) var(--r-md) var(--r-md) 12px;
+}
+</style>
diff --git a/frontend/src/lib/suggestions.ts b/frontend/src/lib/suggestions.ts
new file mode 100644
index 0000000..2a5ef6d
--- /dev/null
+++ b/frontend/src/lib/suggestions.ts
@@ -0,0 +1,9 @@
+export const DISCOVERY_SUGGESTIONS = [
+  'Focus while coding',
+  'Energy for the gym',
+  'Dutch-language and relaxed',
+  '90s nostalgia',
+  'Surprise me with something new',
+  'Rainy Sunday',
+  'Background for dinner',
+] as const
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index bbcf80c..d5ef513 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,7 +1,12 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
 
-// https://vite.dev/config/
 export default defineConfig({
   plugins: [vue()],
+  server: {
+    proxy: {
+      '/api': 'http://127.0.0.1:8888',
+      '/callback': 'http://127.0.0.1:8888',
+    },
+  },
 })