Rename UI to LED Editor and improve mobile editor layout

Use "LED Editor" in page titles and the home heading. On narrow
viewports, make the file tree an off-canvas drawer with backdrop,
hamburger toggle, Escape to close, and auto-close after opening a
file. Add safe-area and tap-target tweaks, cache-bust static assets.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/static/script.js

@@ -705,7 +705,43 @@ class TextEditor {
     this.hideCompletionDropdown();
   }
 
+  isMobileViewport() {
+    return typeof window !== 'undefined' && window.matchMedia && window.matchMedia('(max-width: 768px)').matches;
+  }
+
+  setMobileSidebarOpen(open) {
+    const sidebar = document.getElementById('sidebar');
+    const backdrop = document.getElementById('sidebar-backdrop');
+    const toggle = document.getElementById('sidebar-toggle');
+    if (!sidebar || !backdrop || !toggle) return;
+    sidebar.classList.toggle('is-open', open);
+    backdrop.classList.toggle('is-open', open);
+    backdrop.hidden = !open;
+    toggle.setAttribute('aria-expanded', String(open));
+  }
+
+  setupMobileSidebar() {
+    const toggle = document.getElementById('sidebar-toggle');
+    const backdrop = document.getElementById('sidebar-backdrop');
+    if (!toggle || !backdrop) return;
+    toggle.addEventListener('click', () => {
+      const sidebar = document.getElementById('sidebar');
+      const isOpen = sidebar?.classList.contains('is-open');
+      this.setMobileSidebarOpen(!isOpen);
+    });
+    backdrop.addEventListener('click', () => this.setMobileSidebarOpen(false));
+    document.addEventListener('keydown', (event) => {
+      if (event.key === 'Escape') {
+        const sidebar = document.getElementById('sidebar');
+        if (sidebar?.classList.contains('is-open')) {
+          this.setMobileSidebarOpen(false);
+        }
+      }
+    });
+  }
+
   setupEventListeners() {
+    this.setupMobileSidebar();
     const persistSession = () => {
       this.saveSessionState();
     };
@@ -1061,6 +1097,9 @@ class TextEditor {
           await this.toggleDirectory(path);
         } else if (!isDirectory) {
           this.openFile(path);
+          if (this.isMobileViewport()) {
+            this.setMobileSidebarOpen(false);
+          }
         } else {
           this.renderFileTree();
         }