fix: Prevent state machine from navigating before URL initialization

Fixed a race condition where the state machine would navigate to /chat
before initializing from the URL, causing direct navigation to /galaxy
URLs to redirect.

**The Problem:**
1. Component mounts, state machine starts in 'convo' state (default)
2. State-to-URL effect fires: "state is convo → navigate to /chat"
3. URL-to-state initialization fires: "we're on /galaxy → NAVIGATE_TO_GALAXY"
4. State transitions to 'galaxy'
5. State-to-URL effect fires again: "state is galaxy → navigate to /galaxy"

This caused a brief redirect to /chat before settling on /galaxy.

**The Solution:**
- Don't mark as initialized immediately after sending the initial event
- Add a second effect that watches for state to match the URL
- Only mark as initialized once state matches the target state for the URL
- This prevents the state-to-URL effect from running before initialization

**Changes:**
- Modified URL-to-state initialization to not mark as initialized immediately
- Added new effect to mark as initialized once state matches URL target
- Added console log: "State initialized from URL, marking as ready"

**Testing:**
Verified with Playwright MCP that navigating directly to /galaxy?node=xxx
no longer redirects to /chat.

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

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

components/AppStateMachine.tsx

@@ -60,12 +60,32 @@ export function AppStateMachineProvider({ children }: { children: React.ReactNod
     if (initialEvent) {
       console.log('[App Provider] Setting initial state:', initialEvent);
       send({ type: initialEvent as any });
+    } else {
+      // No specific route matched, we're probably on homepage or other route
+      // Mark as initialized immediately so we don't interfere
+      isInitializedRef.current = true;
     }
 
-    // Mark as initialized AFTER sending the event
-    isInitializedRef.current = true;
+    // DON'T mark as initialized yet if we sent an event
+    // Wait for the state change to complete
   }, [pathname, send]); // Remove 'state' from dependencies!
 
+  // Mark as initialized once state matches the target from URL
+  useEffect(() => {
+    if (isInitializedRef.current) return;
+
+    const targetStateForPath =
+      pathname === '/chat' ? 'convo' :
+      pathname === '/edit' ? 'edit' :
+      (pathname === '/galaxy' || pathname.startsWith('/galaxy/')) ? 'galaxy' :
+      null;
+
+    if (targetStateForPath && state.matches(targetStateForPath)) {
+      console.log('[App Provider] State initialized from URL, marking as ready');
+      isInitializedRef.current = true;
+    }
+  }, [pathname, state]);
+
   // State machine is source of truth: sync state → URL only
   // This effect ONLY runs when state changes, not when pathname changes
   useEffect(() => {