feat: implement frontend for calendar integration (Phase 3 & 4)

## Frontend Implementation

### Meeting Selection & Management
- Created MeetingSelection component for choosing between multiple active meetings
- Shows both active meetings and upcoming calendar events (30 min ahead)
- Displays meeting metadata with privacy controls (owner-only details)
- Supports creation of unscheduled meetings alongside calendar meetings

### Waiting Room
- Added waiting page for users joining before scheduled start time
- Shows countdown timer until meeting begins
- Auto-transitions to meeting when calendar event becomes active
- Handles early joining with proper routing

### Meeting Info Panel
- Created collapsible info panel showing meeting details
- Displays calendar metadata (title, description, attendees)
- Shows participant count and duration
- Privacy-aware: sensitive info only visible to room owners

### ICS Configuration UI
- Integrated ICS settings into room configuration dialog
- Test connection functionality with immediate feedback
- Manual sync trigger with detailed results
- Shows last sync time and ETag for monitoring
- Configurable sync intervals (1 min to 1 hour)

### Routing & Navigation
- New /room/{roomName} route for meeting selection
- Waiting room at /room/{roomName}/wait?eventId={id}
- Classic room page at /{roomName} with meeting info
- Uses sessionStorage to pass selected meeting between pages

### API Integration
- Added new endpoints for active/upcoming meetings
- Regenerated TypeScript client with latest OpenAPI spec
- Proper error handling and loading states
- Auto-refresh every 30 seconds for live updates

### UI/UX Improvements
- Color-coded badges for meeting status
- Attendee status indicators (accepted/declined/tentative)
- Responsive design with Chakra UI components
- Clear visual hierarchy between active and upcoming meetings
- Smart truncation for long attendee lists

This completes the frontend implementation for calendar integration,
enabling users to seamlessly join scheduled meetings from their
calendar applications.

www/app/(app)/rooms/page.tsx

@@ -19,6 +19,7 @@ import useApi from "../../lib/useApi";
 import useRoomList from "./useRoomList";
 import { ApiError, Room } from "../../api";
 import { RoomList } from "./_components/RoomList";
+import ICSSettings from "./_components/ICSSettings";
 
 interface SelectOption {
   label: string;
@@ -54,6 +55,9 @@ const roomInitialState = {
   recordingType: "cloud",
   recordingTrigger: "automatic-2nd-participant",
   isShared: false,
+  icsUrl: "",
+  icsEnabled: false,
+  icsFetchInterval: 5,
 };
 
 export default function RoomsList() {
@@ -170,6 +174,9 @@ export default function RoomsList() {
         recording_type: room.recordingType,
         recording_trigger: room.recordingTrigger,
         is_shared: room.isShared,
+        ics_url: room.icsUrl,
+        ics_enabled: room.icsEnabled,
+        ics_fetch_interval: room.icsFetchInterval,
       };
 
       if (isEditing) {
@@ -215,6 +222,9 @@ export default function RoomsList() {
       recordingType: roomData.recording_type,
       recordingTrigger: roomData.recording_trigger,
       isShared: roomData.is_shared,
+      icsUrl: roomData.ics_url || "",
+      icsEnabled: roomData.ics_enabled || false,
+      icsFetchInterval: roomData.ics_fetch_interval || 5,
     });
     setEditRoomId(roomId);
     setIsEditing(true);
@@ -553,6 +563,32 @@ export default function RoomsList() {
                   <Checkbox.Label>Shared room</Checkbox.Label>
                 </Checkbox.Root>
               </Field.Root>
+
+              <ICSSettings
+                roomId={editRoomId}
+                roomName={room.name}
+                icsUrl={room.icsUrl}
+                icsEnabled={room.icsEnabled}
+                icsFetchInterval={room.icsFetchInterval}
+                onChange={(settings) => {
+                  setRoom({
+                    ...room,
+                    icsUrl:
+                      settings.ics_url !== undefined
+                        ? settings.ics_url
+                        : room.icsUrl,
+                    icsEnabled:
+                      settings.ics_enabled !== undefined
+                        ? settings.ics_enabled
+                        : room.icsEnabled,
+                    icsFetchInterval:
+                      settings.ics_fetch_interval !== undefined
+                        ? settings.ics_fetch_interval
+                        : room.icsFetchInterval,
+                  });
+                }}
+                isOwner={true}
+              />
             </Dialog.Body>
             <Dialog.Footer>
               <Button variant="ghost" onClick={onClose}>