* 🐛 Add ownership check to share-link deletion
The delete-share-link RPC command only verified file-level edit
permission but did not check if the caller owned the share-link.
This allowed any file editor to delete share-links created by
other users, disrupting collaborative workflows.
The fix adds an ownership check that allows deletion only by:
- The share-link creator (owner-id matches profile-id)
- File admins (is-admin permission)
- File owners (is-owner permission)
Implemented using TDD:
- RED: Test demonstrates IDOR vulnerability (editor can delete)
- GREEN: Ownership check prevents unauthorized deletion
- All existing tests continue to pass
Closes#11289
AI-assisted-by: qwen3.7-plus
* 🐛 Add test coverage for share-link deletion escape hatches
Address code review feedback for PR #11290:
- Add test for editor deleting their own share-link
- Add test for admin deleting editor's share-link
- Add test for owner deleting editor's share-link
- Remove redundant :is-owner check (already included in :is-admin)
- Add clarifying comment about :is-admin including :is-owner
Closes#11289
AI-assisted-by: qwen3.7-plus