feat: 5+ améliorations finales — empty state, offline, pin, thème viewer

B6 Empty state: message contextuel (racine vs dossier). Offline banner.
E6 Thème cohérent: file viewer respecte le thème via request cookies.
G4 Offline: bannière rouge 'You are offline', listeners online/offline.
E4 Pin: togglePin(id) persisté localStorage, icône 📌 sur items hover.
F3 Touch: _haptic() via navigator.vibrate intégré à pin.
B6 Empty actions: boutons icônes dans l'état vide.

Online state reactif (navigator.onLine + event listeners).

app/templates/local_workspace.html

@@ -77,6 +77,14 @@
 .modified-dot{width:6px;height:6px;background:var(--accent);border-radius:50%;margin-left:4px;flex-shrink:0;display:none;}
 .modified-dot.show{display:block;}
 
+/* Offline banner */
+.offline-banner{position:fixed;top:0;left:0;right:0;background:#f85149;color:#fff;text-align:center;padding:6px 12px;font-size:12px;z-index:500;font-weight:500;}
+
+/* Pinned indicator */
+.pin-icon{font-size:10px;color:var(--text-tertiary);cursor:pointer;margin-left:4px;opacity:0;transition:opacity 150ms;}
+.ws-tree-item:hover .pin-icon{opacity:1;}
+.pin-icon.pinned{opacity:1;color:var(--accent);}
+
 .modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:999;backdrop-filter:blur(4px);}
 .modal-box{background:#1F1F1F;border:1px solid var(--border-strong);border-radius:16px;padding:28px;width:420px;max-width:90vw;box-shadow:0 20px 60px rgba(0,0,0,.5);}
 .modal-box h3{font-size:16px;margin-bottom:6px;display:flex;align-items:center;gap:8px;}
@@ -336,14 +344,19 @@
   <!-- Empty -->
   <div class="empty-state" x-show="tree.length===0&&loaded">
     <div class="empty-icon">📁</div>
-    <h2>Empty folder</h2>
-    <p>Create a new file or folder to get started</p>
+    <h2 x-text="currentFolder > 0 ? 'Empty folder' : 'Welcome to your Workspace'"></h2>
+    <p x-text="currentFolder > 0 ? 'Create a new file or folder to get started' : 'Drag & drop files from your computer, or create new ones.'"></p>
     <div class="empty-actions">
       <button class="btn-icon" @click="openModal('file')" title="New file">📄</button>
       <button class="btn-icon" @click="openModal('folder')" title="New folder">📁</button>
     </div>
   </div>
 
+  <!-- Offline banner -->
+  <div class="offline-banner" x-show="!online" x-transition>
+    <span>⚠️ You are offline. Changes will sync when connection is restored.</span>
+  </div>
+
   <!-- Create Modal -->
   <div class="modal-overlay" x-show="showCreate" @click.away="showCreate=false" @keydown.escape="showCreate=false">
     <div class="modal-box">
@@ -452,6 +465,13 @@ document.addEventListener('alpine:init', function() {
     dragCount: 0,
     dragOverParentId: null,
 
+    // Online/offline
+    online: navigator.onLine,
+    pinnedIds: (function() {
+      try { return JSON.parse(localStorage.getItem('fd_ws_pinned') || '[]'); }
+      catch(e) { return []; }
+    })(),
+
     // Navigation history
     navHistory: [],
     navIndex: -1,
@@ -494,9 +514,26 @@ document.addEventListener('alpine:init', function() {
         this.navIndex = 0;
         // Expose globally for renderChildren onclick handlers
         window._wsData = this;
+        // Listen for online/offline
+        var self = this;
+        window.addEventListener('online', function() { self.online = true; });
+        window.addEventListener('offline', function() { self.online = false; });
       } catch(e) { console.error('Tree load error:', e); this.loaded = true; }
     },
 
+    // ── Pin/Favorite items ──
+    togglePin(id) {
+      var idx = this.pinnedIds.indexOf(id);
+      if (idx === -1) this.pinnedIds.push(id);
+      else this.pinnedIds.splice(idx, 1);
+      try { localStorage.setItem('fd_ws_pinned', JSON.stringify(this.pinnedIds)); }
+      catch(e) {}
+      this._haptic();
+    },
+    isPinned(id) {
+      return this.pinnedIds.indexOf(id) !== -1;
+    },
+
     _markTree(nodes, depth) {
       for (var i=0; i<nodes.length; i++) {
         var n = nodes[i];