Bug information

Describe the bug

The native video player loads display preferences (skip forward/back length) once in PlayerViewModel.init {} and caches them for the entire app session. When a user changes these settings in the WebView-based settings UI, the native player continues using the old cached values. There is no bridge between the WebView and native player to communicate settings changes.

Affected code:

PlayerViewModel.kt (lines 169-189) loads preferences once at init:

viewModelScope.launch {
    val displayPreferencesDto = withContext(Dispatchers.IO) {
        displayPreferencesApi.getDisplayPreferences(
            displayPreferencesId = Constants.DISPLAY_PREFERENCES_ID_USER_SETTINGS,
            client = Constants.DISPLAY_PREFERENCES_CLIENT_EMBY,
        ).content
    }
    displayPreferences = DisplayPreferences(
        skipBackLength = customPrefs?.get(Constants.DISPLAY_PREFERENCES_SKIP_BACK_LENGTH)?.toLongOrNull()
            ?: Constants.DEFAULT_SEEK_TIME_MS,
        skipForwardLength = customPrefs?.get(Constants.DISPLAY_PREFERENCES_SKIP_FORWARD_LENGTH)?.toLongOrNull()
            ?: Constants.DEFAULT_SEEK_TIME_MS,
    )
}

fastForward() and rewind() (lines 551-557) read exclusively from this cached object:

fun fastForward() {
    playerOrNull?.seekToOffset(displayPreferences.skipForwardLength)
}

There is no @JavascriptInterface method in NativeInterface.kt to receive display preference updates from the WebView, and no mechanism to refresh the cache after settings change.

Steps to reproduce:

1. Open the Jellyfin Android app
2. Play a video and note the skip forward duration (default 30s)
3. Go to Settings > Playback and change Skip Forward Length to 10s, tap Save
4. Play a video again and use the skip forward button — it still skips 30s
5. Force-close the app and reopen — now it correctly skips 10s

Expected behavior: Changed skip duration should take effect immediately without requiring an app restart.