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>

1 files changed, 18 insertions, 0 deletions

diff --git a/android-app/app/src/main/assets/docs/getting_started.md b/android-app/app/src/main/assets/docs/getting_started.md
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+# Getting Started with Nav
+
+Welcome to your sailing companion. Nav is designed to provide you with all the essential information you need while on the water.
+
+## Navigation Bar
+Use the navigation bar at the bottom to switch between:
+- **Map:** View your current position, AIS targets, and tidal currents.
+- **Instruments:** View detailed performance data like wind, speed, and depth.
+- **Log:** Access your trip log and record voice entries.
+- **Safety:** Quick access to MOB and Anchor Watch.
+
+## Instrument Panel
+The instrument panel can be expanded from the bottom of the map. 
+- **Swipe up** to see more details.
+- **Swipe down** to minimize it and see more of the map.
+
+## Help & Documentation
+You can find more detailed information by tapping the "Help" icon in any of the main screens.