- Chat.tsx: replace mutable variable in render IIFE with useMemo+reduce
to satisfy react-hooks/immutability rule
- ConnectionBanner.tsx: move setState calls into a useCallback to avoid
synchronous setState in effect body (react-hooks/set-state-in-effect)
- useGateway.ts: suppress set-state-in-effect for legitimate mount init
- Add GatewayMessage and JsonPayload interfaces to gateway.ts
- Type WebSocket message parsing with GatewayMessage instead of any
- Use ReturnType<typeof setTimeout> for timer refs
- Type chat event payload destructuring explicitly
- Add ChatPayloadMessage interface for extractText()
- Replace any casts in loadSessions/loadHistory with typed assertions
- Add str() helper in ToolCall.tsx for safe unknown→string extraction
- Use Extract<MessageBlock, ...> type guards instead of `as any` casts
- Type CodeBlock children prop properly
- Add image block type for base64 and URL images
- Parse image/image_url blocks from gateway history
- Render images inline in chat messages (rounded, dark-themed)
- Click-to-zoom lightbox with Escape to close
- Markdown images also use the lightbox component
- Detect base64 images in tool results (e.g. Read tool on image files)
- Support png, jpg, gif, webp formats
- Add LoginScreen component with Gateway URL + Token fields
- Store credentials in localStorage (not in bundle)
- Auto-reconnect with stored credentials on reload
- Add logout button (LogOut icon) in Header
- Remove VITE_GATEWAY_TOKEN from .env.example
- VITE_GATEWAY_WS_URL now only pre-fills the URL field
- Dark neon theme consistent with rest of app
Closes feedback item #4
