Add day view support to record calendar (#22922)

## Summary
- Add a calendar day view and wire it into the record calendar layout
selection
- Update the top bar, time grid, and week/day drag and drop handling to
support the new view
- Extend supported layout logic and public feature flags for calendar
day view access
- Add coverage for calendar view content, calendar container behavior,
top bar behavior, day view rendering, supported layout resolution, and
week event drop handling

<img width="1276" height="852" alt="Screenshot 2026-07-15 at 17 48 33"
src="https://github.com/user-attachments/assets/b1d9d255-2d64-4adb-82b9-3e500cb0d561"
/>


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packages/twenty-server/src/engine/core-modules/feature-flag/constants/public-feature-flag.const.ts

@@ -15,9 +15,9 @@ export const PUBLIC_FEATURE_FLAGS: PublicFeatureFlag[] = [
   {
     key: FeatureFlagKey.IS_CALENDAR_WEEK_VIEW_ENABLED,
     metadata: {
-      label: 'Calendar Week View',
+      label: 'Calendar Day and Week Views',
       description:
-        'Display calendar records in a weekly layout with optional end dates',
+        'Display calendar records in daily or weekly layouts with optional end dates',
     },
   },
   {