feat(android): track cover thumbnails on Home Most-Played + Liked tracks

Replaces the Lucide.Music placeholder with real album art on the two
highest-visibility "track without cover" surfaces. Adds the Room v3
schema export that Phase 20's schema bump generated.

New:
  - models/TrackRef.kt — adds a derived `coverUrl` extension that
    points at `/api/albums/{albumId}/cover` via the
    `http://placeholder.invalid` host. BaseUrlInterceptor rewrites
    it to the live server URL on every request; Coil shares the
    same OkHttp client as Retrofit, so the rewrite + auth-cookie
    flow applies identically. Empty `albumId` yields an empty
    string; callers branch to show the placeholder icon instead.
  - app/schemas/.../AppDatabase/3.json — Room schema artifact from
    the Phase 20 v2→v3 bump (themeMode column on auth_session).

Modified:
  - home/ui/HomeScreen.kt — CompactTrackTile (Home Most-Played
    section) renders AsyncImage when track.coverUrl is non-empty,
    falls back to the existing Lucide.Music icon when blank.
    Background tinted with surfaceVariant so the placeholder reads
    as an empty cover slot.
  - likes/ui/LikedTab.kt — LikedTrackRow restructured from Column to
    Row with a 48dp TrackCoverThumb leading the title/artist column.
    Same AsyncImage-with-fallback pattern.

Album/Playlist/Search/History track rows defer for now — those are
dense and the 56dp cover would push row heights significantly.
Want to see the cover-on-tracks pattern on the simpler screens
first.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/home/ui/HomeScreen.kt

@@ -1,5 +1,6 @@
 package com.fabledsword.minstrel.home.ui
 
+import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -25,6 +26,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
@@ -32,6 +34,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.navigation.NavHostController
+import coil3.compose.AsyncImage
 import com.composables.icons.lucide.Lucide
 import com.composables.icons.lucide.Music
 import com.fabledsword.minstrel.home.data.HomeRepository
@@ -328,18 +331,25 @@ private fun CompactTrackTile(
         Box(
             modifier = Modifier
                 .size(140.dp)
-                .clip(RoundedCornerShape(6.dp)),
+                .clip(RoundedCornerShape(6.dp))
+                .background(MaterialTheme.colorScheme.surfaceVariant),
             contentAlignment = Alignment.Center,
         ) {
-            // No coverUrl on TrackRef — show the music glyph placeholder.
-            // The Flutter port snipes the album's cover via tile-provider
-            // hydration; matching that here is Phase 7+ work.
-            Icon(
-                imageVector = Lucide.Music,
-                contentDescription = null,
-                tint = MaterialTheme.colorScheme.onSurfaceVariant,
-                modifier = Modifier.size(56.dp),
-            )
+            if (track.coverUrl.isEmpty()) {
+                Icon(
+                    imageVector = Lucide.Music,
+                    contentDescription = null,
+                    tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                    modifier = Modifier.size(56.dp),
+                )
+            } else {
+                AsyncImage(
+                    model = track.coverUrl,
+                    contentDescription = track.title,
+                    modifier = Modifier.fillMaxSize(),
+                    contentScale = ContentScale.Crop,
+                )
+            }
         }
         Spacer(Modifier.height(8.dp))
         Text(

android/app/src/main/java/com/fabledsword/minstrel/likes/ui/LikedTab.kt

@@ -1,5 +1,6 @@
 package com.fabledsword.minstrel.likes.ui
 
+import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -11,18 +12,26 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import coil3.compose.AsyncImage
+import com.composables.icons.lucide.Lucide
+import com.composables.icons.lucide.Music
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -196,7 +205,7 @@ private fun SectionHeader(label: String, count: Int) {
 
 @Composable
 private fun LikedTrackRow(track: TrackRef) {
-    Column(
+    Row(
         modifier = Modifier
             .fillMaxWidth()
             // Track-row taps will route to the player queue once Phase 9
@@ -204,22 +213,54 @@ private fun LikedTrackRow(track: TrackRef) {
             // row is informational so swiping the tab still feels
             // responsive without an unfinished playback affordance.
             .clickable(enabled = false, onClick = {})
-            .padding(horizontal = 16.dp, vertical = 10.dp),
+            .padding(horizontal = 16.dp, vertical = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(12.dp),
     ) {
-        Text(
-            text = track.title,
-            style = MaterialTheme.typography.bodyLarge,
-            color = MaterialTheme.colorScheme.onSurface,
-            maxLines = 1,
-            overflow = TextOverflow.Ellipsis,
-        )
-        Text(
-            text = track.artistName.ifEmpty { track.albumTitle },
-            style = MaterialTheme.typography.bodySmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-            maxLines = 1,
-            overflow = TextOverflow.Ellipsis,
-        )
+        TrackCoverThumb(track)
+        Column(modifier = Modifier.weight(1f)) {
+            Text(
+                text = track.title,
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurface,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+            Text(
+                text = track.artistName.ifEmpty { track.albumTitle },
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+        }
+    }
+}
+
+@Composable
+private fun TrackCoverThumb(track: TrackRef) {
+    Box(
+        modifier = Modifier
+            .size(48.dp)
+            .clip(RoundedCornerShape(4.dp))
+            .background(MaterialTheme.colorScheme.surfaceVariant),
+        contentAlignment = Alignment.Center,
+    ) {
+        if (track.coverUrl.isEmpty()) {
+            Icon(
+                imageVector = Lucide.Music,
+                contentDescription = null,
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.size(24.dp),
+            )
+        } else {
+            AsyncImage(
+                model = track.coverUrl,
+                contentDescription = track.title,
+                modifier = Modifier.fillMaxSize(),
+                contentScale = ContentScale.Crop,
+            )
+        }
     }
 }
 

android/app/src/main/java/com/fabledsword/minstrel/models/TrackRef.kt

@@ -31,4 +31,15 @@ data class TrackRef(
     val discNumber: Int? = null,
     val durationSec: Int = 0,
     val streamUrl: String = "",
-)
+) {
+    /**
+     * Cover URL derived from the parent album's `/api/albums/{id}/cover`
+     * endpoint. Uses the placeholder host that `BaseUrlInterceptor`
+     * rewrites to the live server URL — Coil shares the same OkHttp
+     * client as Retrofit so the rewrite + auth-cookie flow applies
+     * identically. Empty `albumId` yields an empty string; callers
+     * branch on isEmpty to show the placeholder icon.
+     */
+    val coverUrl: String
+        get() = if (albumId.isEmpty()) "" else "http://placeholder.invalid/api/albums/$albumId/cover"
+}