1) Burger menu (and other bottom sheets) had rows hidden behind the system
navigation bar: MainActivity never called enableEdgeToEdge(), so the sheets'
navigationBarsPadding resolved to 0. Enable edge-to-edge and place the insets
ourselves — top bar statusBarsPadding, content/FAB navigationBarsPadding,
auth screens systemBarsPadding — and add navigationBarsPadding (+ imePadding
for the editor) to the Filter/Groups/Accounts/Editor sheets.
2) The calendar filter only listed calendars that had events in the loaded
range, so empty calendars couldn't be toggled. Load the full calendar list
from all sources (loadAllCalendars) and merge it with the event-derived
entries — matching iOS, which already shows the complete list.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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