refactor: move feature-flags, calendars, and schedules components from packages/features to apps/web/modules

[hbjORbj]

What does this PR do?

This is the second PR extracting simple migrations from #26571 (which is too large to review at 244 files).

Moves tRPC-dependent UI components from packages/features to apps/web/modules to eliminate circular dependencies:

Feature flags:

• FlagAdminList.tsx, AssignFeatureSheet.tsx → apps/web/modules/feature-flags/components/
• hooks/index.ts → apps/web/modules/feature-flags/hooks/
• flag-listing-view.tsx → apps/web/modules/feature-flags/views/

Calendars:

• AdditionalCalendarSelector.tsx, NoAvailabilityDialog.tsx → apps/web/modules/calendars/components/
• DatePicker.tsx → apps/web/modules/calendars/DatePicker.tsx
• DestinationCalendarSelector.tsx → packages/features/calendars/components/ (reorganized within packages/features)

Schedules:

• Schedule.tsx, NewScheduleButton.tsx → apps/web/modules/schedules/components/
• date-override-list.test.tsx moved with component

Type refactoring (to remove tRPC RouterOutputs dependency):

• DateOverrideList.tsx - replaced RouterOutputs["viewer"]["travelSchedules"]["get"] with local TravelSchedule interface
• ScheduleListItem.tsx - replaced RouterOutputs["viewer"]["availability"]["list"]["schedules"][number] with local Schedule interface
• DestinationCalendarSelector.tsx - replaced RouterOutputs["viewer"]["calendars"]["connectedCalendars"] with local interfaces

All import paths updated across the codebase including platform atoms.

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - no documentation changes needed.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

1. Run type checking: yarn type-check:ci --force
2. Run linting: yarn lint
3. Verify availability settings page works correctly
4. Verify feature flags admin page loads

Human Review Checklist

• Verify the local interfaces in DateOverrideList.tsx, ScheduleListItem.tsx, and DestinationCalendarSelector.tsx match the original RouterOutputs types
• Confirm all import paths are correctly updated
• Check that no other files still import from the old locations

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