Add Rédaction view: Binder + TipTap editor

Phase 1 of Solution 3 (Scrivener-inspired writing environment):
- Binder panel: scenes grouped by act, status indicators, word counts
- TipTap rich text editor with toolbar (bold, italic, headings, lists, blockquote)
- Auto-save after 1.5s of inactivity
- New NocoDB table "Contenu" (SceneId, Texte, Mots)
- API routes: GET/PUT /api/contenu/:sceneId, GET /api/contenu (word counts)
- Total word count in binder footer
- Navigation: Vision / Frise / Rédaction

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server.js

@@ -15,6 +15,7 @@ const NOCODB_TOKEN = process.env.NOCODB_TOKEN || '';
 const NOCODB_BASE_ID = process.env.NOCODB_BASE_ID || '';
 const NOCODB_TABLE_ID = process.env.NOCODB_TABLE_ID || '';
 const NOCODB_VISION_TABLE_ID = process.env.NOCODB_VISION_TABLE_ID || '';
+const NOCODB_CONTENU_TABLE_ID = process.env.NOCODB_CONTENU_TABLE_ID || '';
 
 // Auth
 function makeToken(ts) {
@@ -173,6 +174,71 @@ app.patch('/api/vision/:id', requireAuth, async (req, res) => {
   }
 });
 
+// ── Contenu API (scene text for Rédaction view) ──
+
+// List all word counts (for binder display)
+app.get('/api/contenu', requireAuth, async (req, res) => {
+  try {
+    const url = `${NOCODB_URL}/api/v1/db/data/noco/${NOCODB_BASE_ID}/${NOCODB_CONTENU_TABLE_ID}?limit=200&fields=SceneId,Mots`;
+    const r = await fetch(url, { headers: { 'xc-token': NOCODB_TOKEN } });
+    const data = await r.json();
+    res.json(data);
+  } catch (e) {
+    res.status(500).json({ error: e.message });
+  }
+});
+
+// Get content for a scene
+app.get('/api/contenu/:sceneId', requireAuth, async (req, res) => {
+  try {
+    const url = `${NOCODB_URL}/api/v1/db/data/noco/${NOCODB_BASE_ID}/${NOCODB_CONTENU_TABLE_ID}?where=(SceneId,eq,${req.params.sceneId})&limit=1`;
+    const r = await fetch(url, { headers: { 'xc-token': NOCODB_TOKEN } });
+    const data = await r.json();
+    const row = data.list?.[0] || null;
+    res.json(row);
+  } catch (e) {
+    res.status(500).json({ error: e.message });
+  }
+});
+
+// Save content for a scene (create or update)
+app.put('/api/contenu/:sceneId', requireAuth, async (req, res) => {
+  try {
+    const sceneId = Number(req.params.sceneId);
+    // Check if row exists
+    const findUrl = `${NOCODB_URL}/api/v1/db/data/noco/${NOCODB_BASE_ID}/${NOCODB_CONTENU_TABLE_ID}?where=(SceneId,eq,${sceneId})&limit=1`;
+    const findR = await fetch(findUrl, { headers: { 'xc-token': NOCODB_TOKEN } });
+    const findData = await findR.json();
+    const existing = findData.list?.[0];
+
+    const payload = { SceneId: sceneId, Texte: req.body.Texte, Mots: req.body.Mots || 0 };
+
+    if (existing) {
+      // Update
+      const url = `${NOCODB_URL}/api/v1/db/data/noco/${NOCODB_BASE_ID}/${NOCODB_CONTENU_TABLE_ID}/${existing.Id}`;
+      const r = await fetch(url, {
+        method: 'PATCH',
+        headers: { 'xc-token': NOCODB_TOKEN, 'Content-Type': 'application/json' },
+        body: JSON.stringify(payload),
+      });
+      const data = await r.json();
+      res.json(data);
+    } else {
+      // Create
+      const url = `${NOCODB_URL}/api/v1/db/data/noco/${NOCODB_BASE_ID}/${NOCODB_CONTENU_TABLE_ID}`;
+      const r = await fetch(url, {
+        method: 'POST',
+        headers: { 'xc-token': NOCODB_TOKEN, 'Content-Type': 'application/json' },
+        body: JSON.stringify(payload),
+      });
+      const data = await r.json();
+      res.status(r.status).json(data);
+    }
+  } catch (e) {
+    res.status(500).json({ error: e.message });
+  }
+});
+
 // Auth gate — redirect to login page if not authenticated
 app.get('/', (req, res) => {
   if (isAuth(req)) {