Add hidden dev log (long-press drag handle)

NavLogger is a 200-entry in-memory ring buffer with format:
  HH:mm:ss.SSS LEVEL tag: message

Entries are written at:
- App start
- First GPS fix (lat/lon/sog/cog)
- fetchCurrentConditions: request params + full success summary
  (wind, temp, waves, swell, current) or exception class+message
- fetchForecastItems: request params + item count or error

DevLogSheet (BottomSheetDialogFragment) shows the log in a
monospace ScrollView with Copy and Clear buttons. Trigger: long-press
the drag handle bar on the instrument bottom sheet.

Primary use: copy the log and paste it to Claude to diagnose
conditions API failures without needing adb.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

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