Add 4 card types, evidence board with red yarn strings, and 8 unique persistent boards

server/index.js

@@ -75,7 +75,20 @@ function readDeskState() {
   try {
     if (fs.existsSync(DESK_FILE)) {
       const raw = fs.readFileSync(DESK_FILE, 'utf-8');
-      return JSON.parse(raw);
+      const desk = JSON.parse(raw);
+      if (desk && (!desk.boards || typeof desk.boards !== 'object')) {
+        const currentBoard = desk.activeBoard || (desk.settings && desk.settings.deskTexture) || 'oak';
+        desk.boards = {
+          [currentBoard]: {
+            cards: desk.cards || [],
+            props: desk.props || [],
+            strokes: desk.strokes || [],
+            settings: desk.settings || {}
+          }
+        };
+        desk.activeBoard = currentBoard;
+      }
+      return desk;
     }
   } catch (err) {
     console.error('Error reading desk state:', err);
@@ -142,17 +155,28 @@ app.get('/api/desk', (_req, res) => {
 
 // Save desk state
 app.post('/api/desk', (req, res) => {
-  const { cards, props, strokes, settings, originClientId } = req.body;
+  const { cards, props, strokes, settings, activeBoard, boards, originClientId } = req.body;
 
   if (!Array.isArray(cards)) {
     return res.status(400).json({ success: false, error: 'Invalid desk state: cards required' });
   }
 
+  const currentBoard = activeBoard || (settings && settings.deskTexture) || 'oak';
+  const updatedBoards = boards && typeof boards === 'object' ? { ...boards } : {};
+  updatedBoards[currentBoard] = {
+    cards,
+    props: Array.isArray(props) ? props : [],
+    strokes: Array.isArray(strokes) ? strokes : [],
+    settings: settings || {}
+  };
+
   const newState = {
     cards,
     props: Array.isArray(props) ? props : [],
     strokes: Array.isArray(strokes) ? strokes : [],
     settings: settings || {},
+    activeBoard: currentBoard,
+    boards: updatedBoards,
     updatedAt: Date.now()
   };