Tech debt: Room list fast-path, delete AnchorWatchHandler orphan, LogbookRepository thread safety

Room fast-path (item 3):
- TrackEntity.toShallowSavedTrack() reconstructs SavedTrack from cached summary
  data using two placeholder TrackPoints that preserve correct endMs for logbook
  filtering without parsing GPX
- TrackRepository.getSavedTracksFromRoom() returns shallow tracks sorted by startMs
- MainViewModel.init{} now shows Room data immediately (no spinner on warm start),
  then replaces with full GPX-parsed tracks once background load completes

AnchorWatchHandler orphan (item 4):
- Deleted ui/anchorwatch/AnchorWatchHandler.kt — the anchor depth/rode form was
  inlined into SafetyFragment; this Fragment had no navigation entry points left
- Deleted layout/fragment_anchor_watch.xml (only referenced by the deleted Fragment)

LogbookRepository thread safety (item 6):
- Added @Synchronized to save(), getAll(), and reload() to prevent concurrent
  mutation of the entries list and nextId counter across coroutine contexts

https://claude.ai/code/session_01KXYBuAHZkvv63DeUG6XaZD

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