Add weekly layout to record calendar (#22819)

## Summary

- Add a week layout to record calendar views and persist the selected
layout.
- Render `DATE` calendars as an all-day week and `DATE_TIME` calendars
as an hourly week.
- Add an optional end date field across calendar configuration,
metadata, persistence, and complete-view upserts.
- Use configured end values for ranged and multi-day events, with a
one-hour fallback when a `DATE_TIME` end is absent or invalid.
- Keep calendar cards consistent with the existing compact view,
including checkbox selection and whole-card record opening.
- Gate the weekly layout and end-date behavior behind the public Labs
`IS_CALENDAR_WEEK_VIEW_ENABLED` workspace feature flag.

## Week interactions

- Show overlapping timed events side by side and cap the visible records
at two per day.
- Display start and end times on timed cards, enforce a readable
30-minute minimum height, and keep today’s text contrast stronger.
- Drag timed events between days and times with 30-minute snapping while
preserving their duration, including zero-duration events.
- Show a create button when hovering a 30-minute slot; keyboard users
can focus a day, move the slot with the arrow keys, and reach the same
contextual action.
- Initialize new records with the selected slot time and a compatible
writable end value one hour later.
- Show the workspace time zone and current-time indicator in timed
weeks; date-only weeks keep the all-day section without an hourly grid.

## Configuration and data loading

- Only allow end fields that match the start field type, and prevent
selecting the same field for both boundaries.
- Load records whose ranges overlap the visible period so month and week
layouts display the same relevant records.
- Resolve and persist calendar end fields when updating existing views
through `upsert_complete_view`.
- Fall back to Month and ignore the configured end field while the flag
is disabled, without overwriting either persisted setting, so
re-enabling restores the previous configuration.
- Expose the flag in Labs and keep it default-off for workspaces without
a stored value; enable it in the development seeder.

<img width="1285" height="808" alt="Screenshot 2026-07-15 at 15 50 17"
src="https://github.com/user-attachments/assets/b7e3f7f1-ca77-492f-8cce-cca186ebca0b"
/>

packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/__tests__/from-view-manifest-to-universal-flat-view.util.spec.ts

@@ -114,6 +114,7 @@ describe('fromViewManifestToUniversalFlatView', () => {
     ).toBeNull();
     expect(result.calendarLayout).toBeNull();
     expect(result.calendarFieldMetadataUniversalIdentifier).toBeNull();
+    expect(result.calendarEndFieldMetadataUniversalIdentifier).toBeNull();
     expect(result.anyFieldFilterValue).toBeNull();
   });
 
@@ -126,6 +127,7 @@ describe('fromViewManifestToUniversalFlatView', () => {
         type: ViewType.CALENDAR,
         calendarLayout: ViewCalendarLayout.WEEK,
         calendarFieldMetadataUniversalIdentifier: 'field-uuid-date',
+        calendarEndFieldMetadataUniversalIdentifier: 'field-uuid-end-date',
       },
       applicationUniversalIdentifier,
       now,
@@ -135,6 +137,9 @@ describe('fromViewManifestToUniversalFlatView', () => {
     expect(result.calendarFieldMetadataUniversalIdentifier).toBe(
       'field-uuid-date',
     );
+    expect(result.calendarEndFieldMetadataUniversalIdentifier).toBe(
+      'field-uuid-end-date',
+    );
   });
 
   it('should preserve anyFieldFilterValue from the manifest', () => {

packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/from-field-manifest-to-universal-flat-field-metadata.util.ts

@@ -112,6 +112,7 @@ export const fromFieldManifestToUniversalFlatFieldMetadata = ({
     fieldPermissionUniversalIdentifiers: [],
     kanbanAggregateOperationViewUniversalIdentifiers: [],
     calendarViewUniversalIdentifiers: [],
+    calendarEndViewUniversalIdentifiers: [],
     mainGroupByFieldMetadataViewUniversalIdentifiers: [],
     viewSortUniversalIdentifiers: [],
     searchFieldMetadataUniversalIdentifiers: [],

packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/from-view-manifest-to-universal-flat-view.util.ts

@@ -36,6 +36,8 @@ export const fromViewManifestToUniversalFlatView = ({
     calendarLayout: viewManifest.calendarLayout ?? null,
     calendarFieldMetadataUniversalIdentifier:
       viewManifest.calendarFieldMetadataUniversalIdentifier ?? null,
+    calendarEndFieldMetadataUniversalIdentifier:
+      viewManifest.calendarEndFieldMetadataUniversalIdentifier ?? null,
     mainGroupByFieldMetadataUniversalIdentifier:
       viewManifest.mainGroupByFieldMetadataUniversalIdentifier ?? null,
     shouldHideEmptyGroups: viewManifest.shouldHideEmptyGroups ?? false,

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

@@ -12,6 +12,14 @@ export type PublicFeatureFlag = {
 };
 
 export const PUBLIC_FEATURE_FLAGS: PublicFeatureFlag[] = [
+  {
+    key: FeatureFlagKey.IS_CALENDAR_WEEK_VIEW_ENABLED,
+    metadata: {
+      label: 'Calendar Week View',
+      description:
+        'Display calendar records in a weekly layout with optional end dates',
+    },
+  },
   {
     key: FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED,
     metadata: {