Add notes to finished tracks, single Nav voice, fix speed coloring

- TrackDetailSheet: + Add note button opens a dialog with text, camera,
  and gallery. Entry is saved with timestampMs=track.endMs so it lands
  inside the track's time window and appears automatically in the event
  log. logEventAdapter.update() refreshes the list after save.

- TripReportGenerator: removed NarrativeStyle enum and 4-style branch.
  generateNarrative() now emits a concise PASSAGE header (date, time
  range, duration), stats line (nm / avg kt / max kt), optional conditions
  (seas, temp), and a timestamped deck log. Fragment and layout updated to
  remove the ChipGroup style picker.

- TrackColors: replaced Expression.get("color") — which silently fails
  for lineColor on LineLayer in MapLibre Android 11.x — with
  Expression.step(Expression.get("speed"), ...) that maps the numeric
  "speed" property directly to color literals. "color" string property
  removed from speedSegments() features.

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

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