Cleans up the lint warnings the pre-commit hook surfaces, without any
behavioral change:
- Remove unused imports/vars/destructured props (parseISO, useEffect,
format, durMin, roles, daysInYear, ALLOWED_PLUGIN_FILES, continuesBefore,
isPushConnected, isSelected) and the now-unused parseDuration import.
- Drop three stale `// eslint-disable-next-line no-undef` directives that
no longer suppress anything (browser-navigation, smime/crypto-engine).
- recurrence-expansion.test.ts: replace 39 `as any` casts with a cast-only
`rule()` helper for partial recurrence-rule fixtures, typed access to
utcStart/utcEnd (now on CalendarEvent), and the source's
`Partial<CalendarEvent> & { excluded?: boolean }` for the excluded
override. No defaults are injected, so the expansion logic sees the same
partial rules as before (35 tests still green).
Remaining: 7 react-hooks/exhaustive-deps warnings are left as-is — adding
the missing deps changes effect/memo timing and needs per-hook review, not
a mechanical fix. tsc --noEmit clean; eslint 0 errors / 7 warnings.
