feat(frontend): tile-based room rendering with LimeZu floor patterns

src/frontend/FarmCanvas.jsx

@@ -2,7 +2,7 @@
 import { useRef, useCallback } from 'react';
 import { useStore } from './store';
 import { rooms, agentDesks } from './officeMap';
-import { TILESET_URL, TILE_INDEX, ROOM_TILE_STYLES, tileSourceOffset } from './src/tileLoader';
+import { TILESET_URL, TILE_INDEX, ROOM_TILE_STYLES } from './src/tileLoader';
 
 const TILE = 32;
 const SCALE = 2; // 2x = 64px per tile