feat: custom achievement sound

[xXJSONDeruloXx]

Description

WIP

Recording

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Summary by cubic

Adds a custom achievement unlock sound with a settings toggle and optional user-selected audio file. Plays when the achievement overlay appears, falling back to a bundled default if no custom sound is set.

• New Features
  • Settings: toggle for achievement sound, plus a custom audio picker with a clear-to-default option.
  • Persists selection in PrefManager (achievementSoundEnabled, achievementSoundUri) and retains URI read permission across restarts.
  • Playback handled by AchievementSoundPlayer, defaulting to res/raw/achievement_unlock.ogg.
  • Hooked into the overlay so the sound plays on display; in DEBUG builds, a test notification fires ~30s after launch.

^{Written for commit ca61dd4. Summary will update on new commits.}

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