feat: podcast improvements

[RadNotRed]

I've improved the podcast player and it makes it easier to control for longer episodes. I use this for my daily and this was just one of the things I felt was missing since I'm a big podcast listener

• Added forward and backward seek buttons for podcasts
• Added settings for 5, 10, 15, 30, or 60 second seek intervals on podcasts
• Added previous and next episode controls
• Podcasts now save playback progress
• Added download options for one episode or all episodes
• Added playback speed controls for podcasts that ignore crossfade settings since podcasts shouldn't crossfade
• Hid music only menu such as adding podcast episodes to playlists in the player menu
• Player and mini player show correct controls as well
• Android notifications, lock screen controls, and the One UI Now Bar now show podcast seek buttons instead of previous and next

Tested using android debug

• S24 Ultra (SM-S928U)
• Android 16
• SDK 36

Tested podcast playback, seeking, playback speed, episode progress, and switching between podcasts and music

Links to: maxrave-dev/SimpMusic#2303

[Copilot]

Pull request overview

This PR enhances the player stack to treat podcasts as a distinct media type, improving long-form playback ergonomics (seek controls/intervals), disabling crossfade behaviors that don’t fit podcasts, and persisting per-episode progress across sessions.

Changes:

• Added podcast media-type detection and propagation across Track/GenericMediaItem/SongEntity, plus seek-interval normalization and tests.
• Updated Android (Media3/ExoPlayer) and JVM (mpv) adapters to avoid crossfading podcasts and to apply podcast-specific audio handling (audio-session reporting / speech boost).
• Implemented podcast playback-position persistence and restore logic in both Android and JVM media handlers.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
media/media3/src/main/java/com/maxrave/media3/exoplayer/CrossfadeExoPlayerAdapter.kt	Reports active audio session changes and prevents crossfade/auto-meta behaviors for podcasts.
media/media-jvm/src/main/java/com/simpmusic/media_jvm/mpv/MpvPlayerAdapter.kt	Enables podcast-specific playback behavior (speech boost) and skips crossfade meta loading for podcasts.
media/media-jvm/src/main/java/com/simpmusic/media_jvm/mpv/MpvPlayer.kt	Adds a software gain “speech boost” factor into mpv volume application.
domain/src/commonTest/kotlin/com/maxrave/domain/extension/PodcastMediaTypeTest.kt	Adds unit coverage for podcast media-type propagation and seek-interval normalization.
domain/src/commonMain/kotlin/com/maxrave/domain/mediaservice/player/MediaPlayerListener.kt	Adds an audio-session callback hook for Android audio effects attachment timing.
domain/src/commonMain/kotlin/com/maxrave/domain/mediaservice/handler/MediaPlayerHandler.kt	Introduces SeekBy event and a PODCAST playlist type helper.
domain/src/commonMain/kotlin/com/maxrave/domain/manager/DataStoreManager.kt	Adds podcast seek interval settings and normalization utilities.
domain/src/commonMain/kotlin/com/maxrave/domain/extension/AllExt.kt	Adds isPodcast helpers and preserves podcast type during entity/item conversions.
data/src/jvmMain/kotlin/com/maxrave/data/mediaservice/JvmMediaPlayerHandlerImpl.kt	Implements podcast progress save/restore and adds support for SeekBy.
data/src/commonMain/kotlin/com/maxrave/data/dataStore/DataStoreManagerImpl.kt	Persists podcast seek interval preferences (forward/rewind).
data/src/androidMain/kotlin/com/maxrave/data/mediaservice/MediaServiceHandlerImpl.kt	Implements podcast progress save/restore, SeekBy, and audio-session-driven normalization behavior.
common/src/commonMain/kotlin/com/maxrave/common/Config.kt	Adds the PODCAST media type constant and a DataStore key prefix for episode progress.

Suppressed comments (2)

data/src/androidMain/kotlin/com/maxrave/data/mediaservice/MediaServiceHandlerImpl.kt:2166

• clearPodcastPosition writes to DataStore via putString on coroutineScope (often Main). Because putString does not dispatch to Dispatchers.IO, this can do disk-backed work on the main thread. Run this write on Dispatchers.IO (or backgroundScope) instead.

        coroutineScope.launch {
            dataStoreManager.putString("$PODCAST_PROGRESS_KEY_PREFIX${mediaItem.mediaId}", "0")

data/src/jvmMain/kotlin/com/maxrave/data/mediaservice/JvmMediaPlayerHandlerImpl.kt:2249

• clearPodcastPosition performs a DataStore write via putString on coroutineScope. Since putString does not switch to Dispatchers.IO, doing this on the handler scope can introduce avoidable blocking/latency. Run the write on Dispatchers.IO (or backgroundScope) instead.

        coroutineScope.launch {
            dataStoreManager.putString("$PODCAST_PROGRESS_KEY_PREFIX${mediaItem.mediaId}", "0")
        }

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