Add Timeline related-record action launcher (#24677)

## Summary

- add a stable `+` action to the Timeline widget that opens a native
side-panel command page
- expose task, note, attachment, email, and calendar-event creation
through shared related-record action bindings
- make every widget-local `+` consume the same visibility, disabled
state, reason, label, and execution behavior as the aggregate launcher
- pass the target record explicitly and preserve it in page-scoped
side-panel state, so actions do not depend on record-layout React
context
- reuse the existing task/note drawers, attachment upload, email
composer, and calendar-event composer; this PR does not create timeline
occurrences directly

## Stack

Base: `codex/calendar-event-composer` (#24667)

This PR is intentionally stacked because the calendar-event action
reuses the composer added and refined in #24667.

## UI

The launcher uses the existing `SidePanelList`, `SidePanelGroup`,
`SelectableListItem`, and `CommandMenuItem` pattern.
Permission-ineligible actions are hidden; recoverable prerequisites
remain visible and disabled with contextual text.

Manual local verification on a company record:

- Timeline `+` opens the five-action launcher without a record-layout
context error
- Compose email opens the existing email composer with the related
person prefilled
- Calendar event action is wired to the existing calendar-event composer
- no task, note, attachment, email, or calendar event was submitted
during manual verification

## Validation

- `yarn nx build twenty-shared --skip-nx-cache` — passed
- `yarn nx build twenty-sdk --skip-nx-cache` — passed
- `./node_modules/.bin/tsgo --noEmit -p
packages/twenty-front/tsconfig.json` — passed
- `npx jest
packages/twenty-front/src/modules/activities/hooks/__tests__/useHasAnyRelatedRecordAction.test.ts
packages/twenty-front/src/modules/page-layout/widgets/components/__tests__/WidgetActionRelatedRecord.test.tsx
packages/twenty-front/src/modules/side-panel/pages/create-related-record/components/__tests__/SidePanelCreateRelatedRecordPage.test.tsx
--config packages/twenty-front/jest.config.mjs --runInBand` — 3 suites /
9 tests passed
- type-aware `oxlint` on 23 changed front-end files — 0 warnings / 0
errors
- type-aware `oxlint` on
`packages/twenty-shared/src/types/SidePanelPages.ts` — 0 warnings / 0
errors
- `npx oxfmt --check` on affected front-end modules and the shared enum
— passed
- `git diff --check` — passed


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