Add option to override user profile settings for audio & subtitle languages (#1680)

## Description
Adds settings under the "User profile settings" section which allows for
specifying preferred languages for audio and subtitles and the preferred
subtitle mode.

By default (matching existing Wholphin behavior), the preferred
languages and subtitle mode are derived from the user's profile settings
provided by the server which can be set on the WebUI:
User->Settings->Playback or Subtitles. However, this isn't well
understood and Wholphin doesn't display these values anywhere, so many
users were confused.

The preferred languages and subtitle mode can now be configured from
within Wholphin. Setting these will **not** update the server. The
settings are **only** used locally.

### Related issues
Related to #319
Closes #790

### Testing
Emulator manually changing some settings, added additional unit tests to
ensure the overrides are respected when choosing tracks

## Screenshots
### Settings page
<img width="1280" height="720" alt="settings_01 Large"
src="https://github.com/user-attachments/assets/28cc2f6b-3a60-42a4-b268-48695086d566"
/>

### Clicking into "More user profile settings"
<img width="1280" height="720" alt="settings_02 Large"
src="https://github.com/user-attachments/assets/6c3be3aa-c177-4d44-8060-b76d15fb10d7"
/>

### Language choice dialog

Can filter languages by typing in the search box at the top

<img width="1280" height="720" alt="settings_03 Large"
src="https://github.com/user-attachments/assets/c014d0ba-8d5b-4201-a6ee-4876b478148c"
/>


## AI or LLM usage
None

app/src/test/java/com/github/damontecres/wholphin/services/StreamChoiceServiceTest.kt

@@ -3,11 +3,14 @@ package com.github.damontecres.wholphin.services
 import com.github.damontecres.wholphin.data.PlaybackLanguageChoiceDao
 import com.github.damontecres.wholphin.data.ServerRepository
 import com.github.damontecres.wholphin.data.model.ItemPlayback
+import com.github.damontecres.wholphin.data.model.JellyfinUserPreferences
 import com.github.damontecres.wholphin.data.model.PlaybackLanguageChoice
 import com.github.damontecres.wholphin.data.model.TrackIndex
 import com.github.damontecres.wholphin.preferences.AppPreferences
 import com.github.damontecres.wholphin.preferences.DefaultUserConfiguration
+import com.github.damontecres.wholphin.preferences.SubtitleModePreference
 import com.github.damontecres.wholphin.preferences.UserPreferences
+import com.github.damontecres.wholphin.preferences.UserProfileSettings
 import io.mockk.every
 import io.mockk.mockk
 import org.jellyfin.sdk.model.UUID
@@ -800,6 +803,80 @@ class TestStreamChoiceServiceOnlyForcedClientOverride(
     }
 }
 
+/**
+ * Tests for client-side "Only Forced" override (TrackIndex.ONLY_FORCED).
+ * This tests the findForcedTrack function with user subtitle language preference.
+ */
+@RunWith(Parameterized::class)
+class TestStreamChoiceServiceAppPreferences(
+    val input: TestInput,
+) {
+    @Test
+    fun test() {
+        runTest(input)
+    }
+
+    companion object {
+        @JvmStatic
+        @Parameterized.Parameters(name = "{index}: {0}")
+        fun data(): Collection<TestInput> =
+            listOf(
+                TestInput(
+                    expectedIndex = 1,
+                    userSubtitleMode = SubtitlePlaybackMode.ALWAYS,
+                    userSubtitleLang = "spa",
+                    subtitles =
+                        listOf(
+                            subtitle(0, "eng", default = true),
+                            subtitle(1, "spa"),
+                        ),
+                    streamAudioLang = "eng",
+                    itemPlayback = null,
+                    appSubtitleLang = UserProfileSettings.USE_USER_PROFILE,
+                ),
+                TestInput(
+                    expectedIndex = 0,
+                    userSubtitleMode = SubtitlePlaybackMode.ALWAYS,
+                    userSubtitleLang = "spa",
+                    subtitles =
+                        listOf(
+                            subtitle(0, "eng", default = true),
+                            subtitle(1, "spa"),
+                        ),
+                    streamAudioLang = "eng",
+                    itemPlayback = null,
+                    appSubtitleLang = "eng",
+                ),
+                TestInput(
+                    expectedIndex = 1,
+                    userSubtitleMode = SubtitlePlaybackMode.ALWAYS,
+                    userSubtitleLang = "spa",
+                    subtitles =
+                        listOf(
+                            subtitle(0, "eng", default = true),
+                            subtitle(1, "spa"),
+                        ),
+                    streamAudioLang = "eng",
+                    itemPlayback = null,
+                    appSubtitleLang = "spa",
+                ),
+                TestInput(
+                    expectedIndex = 1, // ItemPlayback
+                    userSubtitleMode = SubtitlePlaybackMode.ALWAYS,
+                    userSubtitleLang = "spa",
+                    subtitles =
+                        listOf(
+                            subtitle(0, "eng", default = true),
+                            subtitle(1, "spa"),
+                        ),
+                    streamAudioLang = "eng",
+                    itemPlayback = itemPlayback(subtitleIndex = 1),
+                    appSubtitleLang = "spa",
+                ),
+            )
+    }
+}
+
 data class TestInput(
     val expectedIndex: Int?,
     val userSubtitleMode: SubtitlePlaybackMode?,
@@ -809,6 +886,9 @@ data class TestInput(
     val subtitles: List<MediaStream>,
     val itemPlayback: ItemPlayback? = null,
     val plc: PlaybackLanguageChoice? = null,
+    val appAudioLang: String = UserProfileSettings.USE_USER_PROFILE,
+    val appSubtitleLang: String = UserProfileSettings.USE_USER_PROFILE,
+    val appSubtitleMode: SubtitleModePreference = SubtitleModePreference.USE_USER_PROFILE,
 ) {
     override fun toString(): String = "test(mode=$userSubtitleMode, subtitles=${subtitles.map { it.toShortString() }})"
 }
@@ -850,7 +930,15 @@ private fun runTest(input: TestInput) {
             candidates = input.subtitles,
             itemPlayback = input.itemPlayback,
             playbackLanguageChoice = input.plc,
-            prefs = UserPreferences(AppPreferences.getDefaultInstance()),
+            prefs =
+                UserPreferences(
+                    AppPreferences.getDefaultInstance(),
+                    JellyfinUserPreferences(
+                        preferredAudioLanguage = input.appAudioLang,
+                        preferredSubtitleLanguage = input.appSubtitleLang,
+                        subtitleMode = input.appSubtitleMode,
+                    ),
+                ),
         )
     Assert.assertEquals(input.expectedIndex, result?.index)
 }

app/src/test/java/com/github/damontecres/wholphin/ui/playback/PlaybackViewModelTests.kt

@@ -132,7 +132,7 @@ class PlaybackViewModelTests {
 
     private fun setupPreferences(block: PlaybackPreferences.Builder.() -> Unit) {
         val appPrefs = AppPreferences.getDefaultInstance().updatePlaybackPreferences(block)
-        val prefs = UserPreferences(appPrefs)
+        val prefs = UserPreferences(appPrefs, null)
         coEvery { mockUserPreferencesService.getCurrent() } returns prefs
     }