Search page improvements (#709)

## Description

Improves how search results are displayed:

- Reorders search categories to Movies → TV Shows → Episodes →
Collections, surfacing the most commonly searched content types at the
top.
- Adds a new "Combined search results" preference in Advanced settings →
Search. When enabled, shows all results in a single list instead of
separate categories.
- When Seerr is active, adds Library/Discover tabs to switch between
local library results and Seerr discovery results.
- Hides empty result categories instead of showing "No results"
placeholders.

### Screenshots

<img width="1935" height="1100" alt="Screenshot_20260116_113656"
src="https://github.com/user-attachments/assets/1e29aa3a-3ba2-4f86-ab61-fed683490474"
/>

<img width="1934" height="1095" alt="image"
src="https://github.com/user-attachments/assets/8b93fa38-d4c9-4e72-a997-caa82b4949f0"
/>

<img width="1921" height="1094" alt="image"
src="https://github.com/user-attachments/assets/82aed1a5-810c-413f-a266-6d78490a1534"
/>

### AI/LLM usage
Code auditing and PR description drafting with Claude Code. Also used
Claude Code for the regex.

app/src/main/java/com/github/damontecres/wholphin/preferences/AppPreferencesSerializer.kt

@@ -66,7 +66,8 @@ class AppPreferencesSerializer
                                             directPlayPgs = AppPreference.DirectPlayPgs.defaultValue
                                             mediaExtensionsEnabled =
                                                 AppPreference.FfmpegPreference.defaultValue
-                                            assPlaybackMode = AppPreference.AssSubtitleMode.defaultValue
+                                            assPlaybackMode =
+                                                AppPreference.AssSubtitleMode.defaultValue
                                         }.build()
 
                                 mpvOptions =
@@ -99,6 +100,13 @@ class AppPreferencesSerializer
                                 backdropStyle = AppPreference.BackdropStylePref.defaultValue
                                 showLogos = AppPreference.ShowLogos.defaultValue
 
+                                searchPreferences =
+                                    SearchPreferences
+                                        .newBuilder()
+                                        .apply {
+                                            combinedSearchResults = false
+                                        }.build()
+
                                 subtitlesPreferences =
                                     SubtitlePreferences
                                         .newBuilder()
@@ -207,6 +215,11 @@ inline fun AppPreferences.updateInterfacePreferences(block: InterfacePreferences
         interfacePreferences = interfacePreferences.toBuilder().apply(block).build()
     }
 
+inline fun AppPreferences.updateSearchPreferences(block: SearchPreferences.Builder.() -> Unit): AppPreferences =
+    updateInterfacePreferences {
+        searchPreferences = searchPreferences.toBuilder().apply(block).build()
+    }
+
 inline fun AppPreferences.updateSubtitlePreferences(block: SubtitlePreferences.Builder.() -> Unit): AppPreferences =
     updateInterfacePreferences {
         subtitlesPreferences = subtitlesPreferences.toBuilder().apply(block).build()

app/src/main/java/com/github/damontecres/wholphin/ui/detail/CardGrid.kt

@@ -338,7 +338,7 @@ fun <T : CardGridItem> CardGrid(
                                     val cardWidth =
                                         ceil((width - (spacingPx * (columns - 1))) / columns)
                                     cardWidthPx = cardWidth.toInt()
-                                    Timber.v("cardWidthPx=%s", cardWidthPx)
+//                                    Timber.v("cardWidthPx=%s", cardWidthPx)
                                 },
                     ) {
                         items(pager.size) { index ->

app/src/main/java/com/github/damontecres/wholphin/util/SearchRelevance.kt

@@ -0,0 +1,89 @@
+package com.github.damontecres.wholphin.util
+
+import com.github.damontecres.wholphin.data.model.BaseItem
+import org.jellyfin.sdk.model.api.BaseItemKind
+import java.util.Locale
+
+object SearchRelevance {
+    private val REGEX_PATTERN = Regex("^/(.+)/(i)?$")
+
+    fun score(
+        item: BaseItem,
+        query: String,
+    ): Int {
+        val name = item.name?.lowercase(Locale.getDefault()) ?: return Int.MAX_VALUE
+        val q = query.lowercase(Locale.getDefault())
+
+        REGEX_PATTERN.find(query)?.let { match ->
+            val pattern = match.groupValues[1]
+            val caseInsensitive = match.groupValues[2] == "i"
+            return regexScore(item.name ?: "", pattern, caseInsensitive) + typeBonus(item.type)
+        }
+
+        return when {
+            name == q -> 0
+            name.startsWith(q) -> 100
+            name.contains(" $q") -> 200
+            name.contains(q) -> 300
+            else -> fuzzyScore(name, q)
+        } + typeBonus(item.type)
+    }
+
+    private fun regexScore(
+        name: String,
+        pattern: String,
+        caseInsensitive: Boolean,
+    ): Int =
+        try {
+            val options = if (caseInsensitive) setOf(RegexOption.IGNORE_CASE) else emptySet()
+            if (Regex(pattern, options).containsMatchIn(name)) 250 else 400
+        } catch (e: Exception) {
+            400
+        }
+
+    private fun fuzzyScore(
+        name: String,
+        query: String,
+    ): Int {
+        val distance = levenshteinDistance(name, query)
+        val maxLen = maxOf(name.length, query.length)
+        val similarity = 1.0 - (distance.toDouble() / maxLen)
+
+        return when {
+            similarity >= 0.8 -> 350
+            similarity >= 0.6 -> 375
+            else -> 400
+        }
+    }
+
+    private fun levenshteinDistance(
+        s1: String,
+        s2: String,
+    ): Int {
+        val m = s1.length
+        val n = s2.length
+        val dp = Array(m + 1) { IntArray(n + 1) }
+        for (i in 0..m) dp[i][0] = i
+        for (j in 0..n) dp[0][j] = j
+        for (i in 1..m) {
+            for (j in 1..n) {
+                dp[i][j] =
+                    if (s1[i - 1] == s2[j - 1]) {
+                        dp[i - 1][j - 1]
+                    } else {
+                        1 + minOf(dp[i - 1][j], dp[i][j - 1], dp[i - 1][j - 1])
+                    }
+            }
+        }
+        return dp[m][n]
+    }
+
+    private fun typeBonus(type: BaseItemKind): Int =
+        when (type) {
+            BaseItemKind.SERIES -> 0
+            BaseItemKind.MOVIE -> 1
+            BaseItemKind.BOX_SET -> 2
+            BaseItemKind.EPISODE -> 10
+            else -> 5
+        }
+}

app/src/main/proto/WholphinDataStore.proto

@@ -165,6 +165,10 @@ message ScreensaverPreferences{
   bool show_clock = 7;
 }
 
+message SearchPreferences {
+  bool combined_search_results = 1;
+}
+
 message InterfacePreferences {
   ThemeSongVolume play_theme_songs = 1;
   bool remember_selected_tab = 2;
@@ -179,6 +183,7 @@ message InterfacePreferences {
   ScreensaverPreferences screensaver_preference = 11;
   bool enable_media_management = 12;
   bool show_logos = 13;
+  SearchPreferences search_preferences = 14;
 }
 
 message AdvancedPreferences {

app/src/main/res/values/strings.xml

@@ -445,6 +445,10 @@
     <string name="color_code_programs">Color-code programs</string>
     <string name="subtitle_delay">Subtitle delay</string>
     <string name="backdrop_display">Backdrop style</string>
+    <string name="combined_search_results">Combined search results</string>
+    <string name="combined_search_results_on">Show all results in a single list</string>
+    <string name="combined_search_results_off">Show results by category</string>
+    <string name="results">Results</string>
     <string name="resolution_switching">Resolution switching</string>
     <string name="local">Local</string>
     <string name="play_trailer">Play trailer</string>