Guest Access: Restructure Meeting Form to Increase Usability

Overview & Context

Apply the same guest-access / waiting-room UI restructure to the Outlook add-in's EventComposePage. Replace the standalone "Waiting room" switch + "Guest access" toggle group with a top-level Guest access switch and a Waiting room toggle group (Inactive / For all participants / For guests only). The underlying state (waitingRoomEnabled: boolean, guestAccess: GuestAccess) and the API payload sent by EventService stay unchanged.

Technical Design & Interfaces

Mapping table (UI → API):

Waiting room (UI)	Guest access (UI)	waitingRoom	guestAccess
Inactive	off	false	Disabled
Inactive	on	false	DirectAccess
For all	off	true	Disabled
For all	on	true	WaitingRoom
For guests only	on	false	WaitingRoom
For guests only	off	n/a - toggle option disabled

Frontend & UI Requirements

Translations (dashboard namespace)

Key	English	German
waiting-room-switch (reused as toggle group label)	Waiting room	Warteraum
guest-access-switch (reused as switch label)	Guest access	Gastzugang
waiting-room-option-disabled	Inactive	Inaktiv
waiting-room-option-all-participants	For all participants	Für alle Teilnehmer
waiting-room-option-guests-only	For guests only	Nur für Gäste

Implementation Notes

• Keep the API contract untouched — only the UI layer changes.
• "Guests-only" without guest access is structurally impossible.
• Waiting-room control must remain available under E2EE — only hide the guest-access switch and disable "guests-only".

Implementation Tasks

• Add guestAccessMapping.ts with deriveUiState / computeFormValues mirroring the web-app helper.
• Refactor the relevant EventComposePage block to render the Guest access switch + Waiting room toggle group driven by the mapping helpers.
• Add the three new translation keys in en/dashboard.json and de/dashboard.json.

Definition of Done (DoD)

• No regressions to the create/update payload sent by EventService — saved events round-trip identically for all UI states.
• Manual verification in Outlook desktop and Outlook web (EN + DE).
• Waiting room can be toggled on E2EE meetings; guest access stays forced off there.