Full-screen map with draggable, collapsible floating HUD windows

- MapLibre map is now a fixed, full-viewport background layer (z-0)
- New FloatingWindow: drag by title bar (pointer capture, viewport-clamped,
  position persisted to localStorage), collapsible to title bar, bring-to-front
  z-index; semi-transparent slate window with amber/cyan accents
- Game screen re-laid out as floating windows over the map: slim top header
  (scenario, turn + date, player nation chip, Idle/Simulating status, Focus map
  collapse-all), dossier (top-left), event feed (right), Your move deck
  (bottom-center), legend (bottom-left), tiny zoom control (bottom-right)
- MapLibre default nav controls removed; custom floating zoom-in/out control
- Panels gain an inWindow mode (no card chrome, same testids)
- server: honor HISTORY_API_PORT as PORT fallback (dev proxy/e2e agreement)
- css: keep maplibre canvas base color and Radix portals above HUD windows

server/index.ts

@@ -40,7 +40,9 @@ const presetsDir = path.join(root, 'presets');
 const clientDir = process.env.CLIENT_DIST ?? path.join(root, 'dist');
 const dataDir = process.env.DATA_DIR ?? path.join(root, 'data');
 
-const PORT = parseInt(process.env.PORT ?? '4321', 10);
+// PORT wins; HISTORY_API_PORT is the override used by the dev proxy (vite) and
+// the e2e config, so honor it as a fallback to keep all three in agreement.
+const PORT = parseInt(process.env.PORT ?? process.env.HISTORY_API_PORT ?? '4321', 10);
 const presetStore = createPresetStore(presetsDir);
 const db: Db = openDb(path.join(dataDir, 'history.db'));
 // LLM_STUB=1 → deterministic stub (tests/e2e/dev without a live model).