fix(terminal): loading state, focus handling, debug logging

- Initialize loading=true in useTerminalSessions to prevent auto-create
  from firing before initial load completes
- Remove hasAutoCreated ref from TerminalPage (no longer needed)
- Add focus() to TerminalRef, call on tab switch
- Add term.focus() after term.open() in TerminalComponent
- Add console logging for WebSocket send/receive to debug no-i/o
- Revert backend _read_loop retry logic to original break-on-error

apps/api/src/api/terminal.py

@@ -254,7 +254,6 @@ async def _handle_terminal_websocket(
 
 async def _read_loop(session_ref: SessionRef, websocket) -> None:
     """Read output from the container and send to WebSocket."""
-    send_failures = 0
     try:
         while True:
             session = session_ref.session
@@ -265,15 +264,10 @@ async def _read_loop(session_ref: SessionRef, websocket) -> None:
             if data:
                 try:
                     await websocket.send_bytes(data)
-                    send_failures = 0
+                except WebSocketDisconnect:
+                    break
                 except Exception:
-                    # Send failed — client may have disconnected.
-                    # Allow a few retries before giving up so transient
-                    # errors don't kill the whole session.
-                    send_failures += 1
-                    if send_failures >= 3:
-                        break
-                    await asyncio.sleep(0.1)
+                    break
             else:
                 await asyncio.sleep(0.01)
     except Exception: