feat: centralized PTY-scoped session state, sync engine debug panel, lifecycle states, WS monitor

- Refactor session state to use ptySessionId as primary key across all components
- Add SessionStateManager with PTY-scoped hook processing, approval tracking, notifications
- Add sync-engine debug panel (AgentStatesSection, HookTimelineSection, TerminalRegistrySection, WsMonitorSection)
- Add useLifecycleStates composable for continuous state chips (session, responding, tool, subagent, compacting)
- Add WS monitor endpoint and composable for real-time connection health
- Enhance SessionLifecycleStatus with animated state chips and badge counts
- Enhance SystemMessage with expanded content and better formatting
- Update hooks (approval-permission, approval-plan, notify) with pty_session injection
- Update approval system to derive pending lists from PTY-scoped state
- Update ChatContainer with PTY-derived agent status and lifecycle events
- Update AgentBadge with PTY-scoped status colors
- Improve PiP window, approval window, and loading window handling

server/routes/session-state-proxy.ts

@@ -16,11 +16,11 @@ export async function handleSessionStateProxy(url: URL): Promise<Response> {
       fetch(`http://localhost:${PORT_TERMINAL}/terminal-registry`, { signal: controller.signal })
     ])
 
-    const stateData = stateResp.ok ? await stateResp.json() : { agents: {} }
+    const stateData = stateResp.ok ? await stateResp.json() : { ptySessions: {} }
     const registryData = registryResp.ok ? await registryResp.json() : { registry: [] }
 
     return jsonResponse({
-      agents: stateData.agents ?? {},
+      ptySessions: stateData.ptySessions ?? {},
       registry: registryData.registry ?? []
     })
   } catch (e: any) {