Inline saved tracks on Log tab; collapse log entry when not recording

Removed the 'Saved Tracks' button that opened a separate overlay.
Tracks now appear directly on the Log screen in a RecyclerView below
the Generate Trip Report button. Tapping a track hides the overlay and
opens the existing TrackDetailSheet bottom sheet over the map.

The log entry section (text field, mic, camera, save/clear) is hidden
with visibility=gone when not recording and shown when a recording is
in progress. The storage-setup prompt is now surfaced here too.

SavedTrackAdapter and DATE_FMT widened to internal so VoiceLogFragment
can reuse them directly. SavedTracksFragment kept for the GPX import flow.

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

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