- New public method fetches binary photo from Graph /users/{id}/photo/$value
- Returns { bytes, contentType } on 200, null on 404 (no photo)
- Throws on other non-2xx for upstream caller to map to 502/503
- Reuses getToken() OAuth2 cache; no retry (best-effort per D-26)
- Existing methods (getToken, fetchJson, getUsers, etc.) untouched
- Add searchMailboxMessages, deleteMailboxMessage, moveToDeletedItems to MsGraphClient
- POST /api/mimecast/mailbox-remediate: search, move, delete actions with permission error handling
- DeliveredAnalysisDialog: Remove from mailbox panel with search → confirm → delete flow
- Shows matching messages in mailbox with checkboxes, received time, read/unread status
- Moves selected to Deleted Items (recoverable) via Graph API
- Surfaces clear permission guidance if Mail.ReadWrite not yet granted
