feat(frontend): implement collaboration service #14
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Description
This PR continues from #8 and replaces #7 to integrate the collaboration service into our frontend.
Screenshots or videos if applicable
Room page (/practice/:room_id)
Add placeholders for Question, Communication, and Code Execution panels. Future PRs should integrate those backend services into the frontend.

Two users collborating in an active room
Integrate collaboration service backend into Code Editor panel:
collab-demo.mp4
Note: "Leave Room" would redirect users back to the home page, and they can rejoin the room again. The backend will automatically close the room after 10 minutes of inactivity (i.e., no connected clients).
TODO: We should have a new home page for users to see their active/inactive rooms (so that they can rejoin the room, or view their past collaboration sessions)
Users viewing a read-only display of a closed room
Error page template (e.g., users accessing an invalid room)
TODO: Will extend to other errors in the next PR together with BE authentication such as:
Type of change
Checklist:
pnpm lintandpnpm format