Fix bottom sheet corners; add full light/dark mode palette

Rounded corners:
- Replace androidx CardView with MaterialCardView + ShapeAppearance.Nav.BottomSheet
  so only the top-left and top-right corners are rounded (24dp); bottom corners
  are square flush with the screen edge

Light/dark mode:
- Introduce values-night/colors.xml with the existing dark M3 palette (moved from
  values/colors.xml); instrument values stay dark (#E6E1E5 text, #1C1B1F bg)
- values/colors.xml now carries the light M3 palette: surface #FFFBFE,
  onSurface #1C1B1F, surfaceVariant #E7E0EB etc.; instrument text flips to dark
  (#1C1B1F normal, #6F6878 secondary) for readability on light backgrounds
- Fix InstrumentUnit hardcoded #6B6070 → ?attr/colorOnSurfaceVariant so the
  unit labels adapt automatically in both modes
- Mark the forecast row (ocean navy #0D2137) and WaveView with
  android:forceDarkAllowed="false" so the system never inverts them — the
  ocean section is intentionally always dark regardless of system theme

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

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