feature/VSN-2830 - feat(client): position email edit button + restrict agent mode actions
- Move "modifier l'email" button next to Email professionnel* input in ClientTab
- Shorten button label to "modifier l'email" for better UX
- Hide email edit button in agent mode and outside clientTab
- Restrict document actions (upload/rename/delete) in agent mode: • Upload button hidden when agentMode=true • Delete/Rename actions hidden in document table actions • Download action remains available in agent mode
- Pass openEmailChange callback to ClientTab for modal handling
- Cleanup unused MemoizedEmailButton component from ClientForm
Closes VSN-2830