fix+feat: layer cards, ocean floor, notifications, units, log, photos

Layer picker:
- Fix blank cards: app:layout_columnWeight → android:layout_columnWeight
  (GridLayout children require android: namespace for weight attributes)
- Add Distance unit chips (nm/km/mi) to UNITS section

Map layers:
- Fix ocean floor: use addLayerAbove(lastFillLayer) instead of addLayerAt(0)
  so base rasters appear above OFM water/land fills but below roads+labels
- CardView elevation 16dp→4dp to eliminate visible shadow border

Notifications:
- Add POST_NOTIFICATIONS to manifest
- Request it alongside location permissions on Android 13+ (TIRAMISU+)

Conditions sheet:
- showOverlay() now always hides bottom sheet (STATE_HIDDEN) so it can't
  leak onto non-map pages; bottom padding (80dp) added to Safety+Log panes

Log entries:
- Log entry form visible always (was only shown while recording)
- Photo-only events filtered from track timeline; photos appear only when
  paired with real text in a log entry

Anchor watch:
- Inputs and output radius now use configured depth unit (ft/m)
  with label updates and ft→m conversion before calculation

Photos:
- Tap thumbnail in track event log → fullscreen dialog viewer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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