Three related bugs fixed:
1. Frontend xterm.js crash: TerminalPage rendered ALL sessions with display:none
for inactive ones. xterm.js crashes when initialized in a hidden container
(Viewport can't read dimensions). Fix: only render the active session's
TerminalComponent using conditional rendering.
2. Backend websocket disconnect cascade: When client disconnected (due to #1),
the server tried to send 'connected' status on dead socket, caught the
WebSocketDisconnect in a generic except block, then tried to close() again
causing RuntimeError. Fix: catch WebSocketDisconnect specifically and suppress
close() errors.
3. Stale DB sessions: After server restart, DB still had old terminal session
rows but no in-memory sessions. list_terminal_sessions returned these ghosts,
causing the frontend to render dead tabs. Fix: skip DB-only sessions that
have no live in-memory counterpart.
Quality gates: pytest (15/15 passed), tsc clean, vitest (7/7 passed)
alex
9f90624aa6