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>
This commit is contained in:
2026-05-26 01:46:53 -04:00
parent a85a95507c
commit 41c6258b05
4 changed files with 739 additions and 27 deletions
@@ -0,0 +1,650 @@
{
"formatVersion": 1,
"database": {
"version": 3,
"identityHash": "4c6180b4cb157afbc109f26f39719439",
"entities": [
{
"tableName": "sync_metadata",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER NOT NULL, `cursor` INTEGER NOT NULL, `lastSyncAt` INTEGER, PRIMARY KEY(`id`))",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "cursor",
"columnName": "cursor",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "lastSyncAt",
"columnName": "lastSyncAt",
"affinity": "INTEGER"
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"id"
]
}
},
{
"tableName": "cached_artists",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` TEXT NOT NULL, `name` TEXT NOT NULL, `sortName` TEXT NOT NULL, `mbid` TEXT, `artistThumbPath` TEXT, `artistFanartPath` TEXT, `fetchedAt` INTEGER NOT NULL, PRIMARY KEY(`id`))",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "name",
"columnName": "name",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "sortName",
"columnName": "sortName",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "mbid",
"columnName": "mbid",
"affinity": "TEXT"
},
{
"fieldPath": "artistThumbPath",
"columnName": "artistThumbPath",
"affinity": "TEXT"
},
{
"fieldPath": "artistFanartPath",
"columnName": "artistFanartPath",
"affinity": "TEXT"
},
{
"fieldPath": "fetchedAt",
"columnName": "fetchedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"id"
]
}
},
{
"tableName": "cached_albums",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` TEXT NOT NULL, `artistId` TEXT NOT NULL, `title` TEXT NOT NULL, `sortTitle` TEXT NOT NULL, `releaseDate` TEXT, `coverPath` TEXT, `mbid` TEXT, `fetchedAt` INTEGER NOT NULL, PRIMARY KEY(`id`))",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "artistId",
"columnName": "artistId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "title",
"columnName": "title",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "sortTitle",
"columnName": "sortTitle",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "releaseDate",
"columnName": "releaseDate",
"affinity": "TEXT"
},
{
"fieldPath": "coverPath",
"columnName": "coverPath",
"affinity": "TEXT"
},
{
"fieldPath": "mbid",
"columnName": "mbid",
"affinity": "TEXT"
},
{
"fieldPath": "fetchedAt",
"columnName": "fetchedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"id"
]
}
},
{
"tableName": "cached_tracks",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` TEXT NOT NULL, `albumId` TEXT NOT NULL, `artistId` TEXT NOT NULL, `title` TEXT NOT NULL, `durationMs` INTEGER NOT NULL, `trackNumber` INTEGER, `discNumber` INTEGER, `filePath` TEXT, `fileFormat` TEXT, `genre` TEXT, `fetchedAt` INTEGER NOT NULL, PRIMARY KEY(`id`))",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "albumId",
"columnName": "albumId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "artistId",
"columnName": "artistId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "title",
"columnName": "title",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "durationMs",
"columnName": "durationMs",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "trackNumber",
"columnName": "trackNumber",
"affinity": "INTEGER"
},
{
"fieldPath": "discNumber",
"columnName": "discNumber",
"affinity": "INTEGER"
},
{
"fieldPath": "filePath",
"columnName": "filePath",
"affinity": "TEXT"
},
{
"fieldPath": "fileFormat",
"columnName": "fileFormat",
"affinity": "TEXT"
},
{
"fieldPath": "genre",
"columnName": "genre",
"affinity": "TEXT"
},
{
"fieldPath": "fetchedAt",
"columnName": "fetchedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"id"
]
}
},
{
"tableName": "cached_likes",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`userId` TEXT NOT NULL, `entityType` TEXT NOT NULL, `entityId` TEXT NOT NULL, `likedAt` INTEGER NOT NULL, PRIMARY KEY(`userId`, `entityType`, `entityId`))",
"fields": [
{
"fieldPath": "userId",
"columnName": "userId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "entityType",
"columnName": "entityType",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "entityId",
"columnName": "entityId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "likedAt",
"columnName": "likedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"userId",
"entityType",
"entityId"
]
}
},
{
"tableName": "cached_playlists",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` TEXT NOT NULL, `userId` TEXT NOT NULL, `name` TEXT NOT NULL, `description` TEXT NOT NULL, `isPublic` INTEGER NOT NULL, `coverPath` TEXT, `trackCount` INTEGER NOT NULL, `durationSec` INTEGER NOT NULL, `systemVariant` TEXT, `fetchedAt` INTEGER NOT NULL, PRIMARY KEY(`id`))",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "userId",
"columnName": "userId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "name",
"columnName": "name",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "description",
"columnName": "description",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "isPublic",
"columnName": "isPublic",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "coverPath",
"columnName": "coverPath",
"affinity": "TEXT"
},
{
"fieldPath": "trackCount",
"columnName": "trackCount",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "durationSec",
"columnName": "durationSec",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "systemVariant",
"columnName": "systemVariant",
"affinity": "TEXT"
},
{
"fieldPath": "fetchedAt",
"columnName": "fetchedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"id"
]
}
},
{
"tableName": "cached_playlist_tracks",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`playlistId` TEXT NOT NULL, `trackId` TEXT NOT NULL, `position` INTEGER NOT NULL, PRIMARY KEY(`playlistId`, `trackId`))",
"fields": [
{
"fieldPath": "playlistId",
"columnName": "playlistId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "trackId",
"columnName": "trackId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "position",
"columnName": "position",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"playlistId",
"trackId"
]
}
},
{
"tableName": "cached_quarantine_mine",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`trackId` TEXT NOT NULL, `reason` TEXT NOT NULL, `notes` TEXT, `createdAt` TEXT NOT NULL, `trackTitle` TEXT NOT NULL, `trackDurationMs` INTEGER NOT NULL, `albumId` TEXT NOT NULL, `albumTitle` TEXT NOT NULL, `albumCoverArtPath` TEXT, `artistId` TEXT NOT NULL, `artistName` TEXT NOT NULL, `fetchedAt` INTEGER NOT NULL, PRIMARY KEY(`trackId`))",
"fields": [
{
"fieldPath": "trackId",
"columnName": "trackId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "reason",
"columnName": "reason",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "notes",
"columnName": "notes",
"affinity": "TEXT"
},
{
"fieldPath": "createdAt",
"columnName": "createdAt",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "trackTitle",
"columnName": "trackTitle",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "trackDurationMs",
"columnName": "trackDurationMs",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "albumId",
"columnName": "albumId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "albumTitle",
"columnName": "albumTitle",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "albumCoverArtPath",
"columnName": "albumCoverArtPath",
"affinity": "TEXT"
},
{
"fieldPath": "artistId",
"columnName": "artistId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "artistName",
"columnName": "artistName",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "fetchedAt",
"columnName": "fetchedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"trackId"
]
}
},
{
"tableName": "audio_cache_index",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`trackId` TEXT NOT NULL, `path` TEXT NOT NULL, `sizeBytes` INTEGER NOT NULL, `cachedAt` INTEGER NOT NULL, `lastPlayedAt` INTEGER, `source` TEXT NOT NULL, PRIMARY KEY(`trackId`))",
"fields": [
{
"fieldPath": "trackId",
"columnName": "trackId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "path",
"columnName": "path",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "sizeBytes",
"columnName": "sizeBytes",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "cachedAt",
"columnName": "cachedAt",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "lastPlayedAt",
"columnName": "lastPlayedAt",
"affinity": "INTEGER"
},
{
"fieldPath": "source",
"columnName": "source",
"affinity": "TEXT",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"trackId"
]
}
},
{
"tableName": "cached_mutations",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `kind` TEXT NOT NULL, `payload` TEXT NOT NULL, `createdAt` INTEGER NOT NULL, `lastAttemptAt` INTEGER, `attempts` INTEGER NOT NULL)",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "kind",
"columnName": "kind",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "payload",
"columnName": "payload",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "createdAt",
"columnName": "createdAt",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "lastAttemptAt",
"columnName": "lastAttemptAt",
"affinity": "INTEGER"
},
{
"fieldPath": "attempts",
"columnName": "attempts",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": true,
"columnNames": [
"id"
]
}
},
{
"tableName": "cached_resume_state",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER NOT NULL, `json` TEXT NOT NULL, `updatedAt` INTEGER NOT NULL, PRIMARY KEY(`id`))",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "json",
"columnName": "json",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "updatedAt",
"columnName": "updatedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"id"
]
}
},
{
"tableName": "cached_home_index",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`section` TEXT NOT NULL, `position` INTEGER NOT NULL, `entityType` TEXT NOT NULL, `entityId` TEXT NOT NULL, `fetchedAt` INTEGER NOT NULL, PRIMARY KEY(`section`, `position`))",
"fields": [
{
"fieldPath": "section",
"columnName": "section",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "position",
"columnName": "position",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "entityType",
"columnName": "entityType",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "entityId",
"columnName": "entityId",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "fetchedAt",
"columnName": "fetchedAt",
"affinity": "INTEGER",
"notNull": true
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"section",
"position"
]
}
},
{
"tableName": "auth_session",
"createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER NOT NULL, `sessionCookie` TEXT, `baseUrl` TEXT NOT NULL, `userJson` TEXT, `themeMode` TEXT, PRIMARY KEY(`id`))",
"fields": [
{
"fieldPath": "id",
"columnName": "id",
"affinity": "INTEGER",
"notNull": true
},
{
"fieldPath": "sessionCookie",
"columnName": "sessionCookie",
"affinity": "TEXT"
},
{
"fieldPath": "baseUrl",
"columnName": "baseUrl",
"affinity": "TEXT",
"notNull": true
},
{
"fieldPath": "userJson",
"columnName": "userJson",
"affinity": "TEXT"
},
{
"fieldPath": "themeMode",
"columnName": "themeMode",
"affinity": "TEXT"
}
],
"primaryKey": {
"autoGenerate": false,
"columnNames": [
"id"
]
}
}
],
"setupQueries": [
"CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
"INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, '4c6180b4cb157afbc109f26f39719439')"
]
}
}
@@ -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(
@@ -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,
)
}
}
}
@@ -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"
}