fix(track): load past tracks via persisted URIs, no MediaStore query needed (#4)

MediaStore.Files.getContentUri("external") queries require READ_EXTERNAL_STORAGE
on Android ≤ 12 and have no clean permission path on Android 13+ for non-media
files. openInputStream() on a content URI the app owns works on all versions
without any permission — so the fix is to persist each URI at save time.

On save: call persistUri(uri) after the IS_PENDING=0 update, storing the
content URI in SharedPreferences (nav_track_uris).

On load: iterate stored URIs first and open each with openInputStream() — no
MediaStore query, no permissions needed. The existing MediaStore query is kept
as a fallback for tracks saved before this change; any track found there is
auto-migrated into SharedPreferences so future launches skip the query too.
Invalid URIs (file deleted) are cleaned up from SharedPreferences automatically.

https://claude.ai/code/session_01DNjbYxiC1cco83dArNGW3G

Co-authored-by: Claude <noreply@anthropic.com>

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