Fix useDaemonSession to return combined state + APIs

Problem: After migrating to pure Zustand, useDaemonSession returned only
SessionState from the store, but components need both state AND imperative
APIs (like sendAgentMessage, createAgent, etc.).

Solution: Create DaemonSession type that combines:
- SessionState (from Zustand store)
- Imperative APIs (from SessionContext)
- Wrapped store actions (getDraftInput, setFocusedAgentId, etc.)

Changes:
- Added DaemonSession type to use-daemon-session.ts
- useDaemonSession now merges sessionState + context + store actions
- Wraps store actions to bind serverId automatically
- Updated prop types in components to use DaemonSession
- Fixed use-session-directory.ts to use SessionState

This restores component compatibility while keeping pure Zustand architecture.

Still TODO: Fix remaining components that use SessionContext directly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/app/src/components/create-agent-modal.tsx

@@ -252,7 +252,7 @@ function AgentFlowModal({
   }, [serverId, daemonEntries]);
   const [selectedServerId, setSelectedServerId] = useState<string | null>(initialServerId);
   const selectSessionSlice = useCallback(
-    (session: SessionContextValue | null): CreateAgentSessionSlice | null => {
+    (session: import("@/hooks/use-daemon-session").DaemonSession | null): CreateAgentSessionSlice | null => {
       if (!session) {
         return null;
       }