feat(app): add controls to sessions on home page

[kostaris]

Issue for this PR

Fixes web-ui home page not having controls for each session

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

1. Extracts reusable SessionActionMenu, SessionDeleteDialog, and SessionSharePopover components.
2. Adds session action menu (rename, share/unshare, export, archive, delete) to home session list rows.
3. Unifies session timeline header actions with the extracted shared components.
4. Makes share popover state reactive to sync store updates.
5. Prevents delete confirmation dialog from closing on deletion failure.
6. Adds unit tests for session actions and descendant deletion.

How did you verify your code works?

• Ran bun test packages/app/src/pages/home/home-session-menu.test.ts.
• Ran bun turbo run typecheck.
• Tested rename, share popover, export, archive, and delete from home screen.

Screenshots / recordings

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[carthageadev]

Yo twin, could we also support right-click -> Rename on Home session rows? Renaming tabs already works that way, so it'd fit the existing design. Your menu button and right-click could both stay. I've got a small patch with tests in #46915 and would be happy to coordinate.