Fixing seek text label overlap and visibility issues. (#923)

## Description
- Smoothly bumps up the title and subtitle text above the seek progress
label when the seek bar is focused to prevent overlap.
- Adds a semi-transparent black backer to the text label that appears
above the seek progress indicator. Helps with visibility when the image
in the playback matches the color of the text. Note: the backer is black
with Alpha of 0.6 for now because I felt that looked good for contrast
across all themes. However, if you prefer it respect a particular theme
color, I'd be willing to make that change.

### Related issues
In the playback screen, when focusing the seek bar on Android TVs (at
least the ones I was able to test), the seek text above the seek bar
will overlap with the media title. This is a purely cosmetic issue in
the UI, but it seemed worth a fix. See before and after images in in the
Screenshots section below

This problem is briefly mentioned in point number 2 of [#528
](https://github.com/damontecres/Wholphin/issues/528)

### Testing
Tested manually on TCL model 50S434 running Android TV. Tested manually
using AVD emulation on Television (1080p) and Television (4K) preset
devices. Reproduced the problem on all 3 devices and confirmed that my
fix works across all.

## Screenshots
Before:
<img width="2046" height="1184" alt="before"
src="https://github.com/user-attachments/assets/64708e13-3fa4-4248-91e3-e203f8ac1f7d"
/>

After:
<img width="2046" height="1183" alt="after"
src="https://github.com/user-attachments/assets/db9d1767-cf93-4153-b13a-9a18fbc89e0c"
/>

## AI or LLM usage
None

---------

Co-authored-by: Ray <154766448+damontecres@users.noreply.github.com>

app/src/main/java/com/github/damontecres/wholphin/ui/playback/PlaybackOverlay.kt

@@ -1,6 +1,7 @@
 package com.github.damontecres.wholphin.ui.playback
 
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.slideInVertically
@@ -18,10 +19,12 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyRow
 import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -443,6 +446,10 @@ fun PlaybackOverlay(
                         text = (seekProgressMs / 1000L).seconds.toString(),
                         color = MaterialTheme.colorScheme.onSurface,
                         style = MaterialTheme.typography.labelLarge,
+                        modifier =
+                            Modifier
+                                .background(Color.Black.copy(alpha = 0.6f), shape = RoundedCornerShape(4.dp))
+                                .padding(horizontal = 8.dp, vertical = 4.dp),
                     )
                 }
             }
@@ -525,13 +532,22 @@ fun Controller(
     seekBarInteractionSource: MutableInteractionSource = remember { MutableInteractionSource() },
     onNextStateFocus: () -> Unit = {},
 ) {
+    val seekBarFocused by seekBarInteractionSource.collectIsFocusedAsState()
+    val verticalOffset by animateDpAsState(
+        targetValue = if (seekBarFocused) (-32).dp else 0.dp,
+        label = "TitleBumpOffset",
+    )
+
     Column(
         verticalArrangement = Arrangement.spacedBy(8.dp),
         modifier = modifier,
     ) {
         Column(
             verticalArrangement = Arrangement.spacedBy(8.dp),
-            modifier = Modifier.padding(start = 16.dp),
+            modifier =
+                Modifier
+                    .padding(start = 16.dp)
+                    .offset(y = verticalOffset),
         ) {
             title?.let {
                 Text(