feat: implement initial frontend application with comprehensive styling, theming, and core structure.

frontend/app.js

@@ -330,6 +330,7 @@
         li.addEventListener("click", () => {
           const input = document.getElementById("search-input");
           input.value = entry;
+          input.dispatchEvent(new Event('input', { bubbles: true }));
           this.hide();
           _triggerAdvancedSearch(entry);
         });
@@ -391,6 +392,7 @@
           } else {
             input.value = (current ? current + " " : "") + "tag:" + item.tag + " ";
           }
+          input.dispatchEvent(new Event('input', { bubbles: true }));
           this.hide();
           input.focus();
           _triggerAdvancedSearch(input.value);
@@ -944,17 +946,22 @@
       }
       userMenu.innerHTML =
         '<span class="user-display-name">' + (user.display_name || user.username) + '</span>' +
-        (user.role === 'admin'
-          ? '<button class="user-menu-link" id="admin-btn" title="Administration"><i data-lucide="shield" style="width:14px;height:14px"></i></button>'
-          : '') +
         '<button class="btn-logout" id="logout-btn" title="Déconnexion"><i data-lucide="log-out" style="width:14px;height:14px"></i></button>';
       safeCreateIcons();
 
       const logoutBtn = document.getElementById('logout-btn');
       if (logoutBtn) logoutBtn.addEventListener('click', () => AuthManager.logout());
 
-      const adminBtn = document.getElementById('admin-btn');
+      const adminRow = document.getElementById('admin-menu-row');
-      if (adminBtn) adminBtn.addEventListener('click', () => AdminPanel.show());
+      if (adminRow) {
+        if (user.role === 'admin') {
+          adminRow.classList.remove('hidden');
+          // Important: use an inline function to ensure we don't bind multiple identical listeners on rerenders, or clean up before
+          adminRow.onclick = () => { closeHeaderMenu(); AdminPanel.show(); };
+        } else {
+          adminRow.classList.add('hidden');
+        }
+      }
     },
 
     // ── Initialization ──────────────────────────────────────────────
@@ -3862,6 +3869,10 @@
       panel.remove();
       return;
     }
+    // Auto reconnect if disconnected when user opens the panel
+    if (IndexUpdateManager.getState() === "disconnected") {
+      IndexUpdateManager.connect();
+    }
     panel = document.createElement("div");
     panel.id = "sync-panel";
     panel.className = "sync-panel";

frontend/index.html

@@ -212,6 +212,15 @@
                   <span class="menu-list-subtitle" id="theme-label">Clair</span>
                 </span>
               </button>
+              <button class="menu-list-row menu-list-button hidden" id="admin-menu-row" type="button" role="menuitem">
+                <span class="menu-list-icon" aria-hidden="true">
+                  <i data-lucide="shield" style="width:17px;height:17px"></i>
+                </span>
+                <span class="menu-list-content">
+                  <span class="menu-list-title">Administration</span>
+                  <span class="menu-list-subtitle">Gérer les utilisateurs</span>
+                </span>
+              </button>
               <button class="menu-list-row menu-list-button" id="config-open-btn" type="button" role="menuitem">
                 <span class="menu-list-icon" aria-hidden="true">
                   <i data-lucide="settings" style="width:17px;height:17px"></i>

frontend/style.css

@@ -2974,7 +2974,7 @@ body.resizing-v {
   display: flex;
   align-items: center;
   justify-content: center;
-  background: linear-gradient(135deg, #0f0c29 0%, #1a1a3e 50%, #24243e 100%);
+  background: linear-gradient(135deg, #090e17 0%, #101827 50%, #1b2838 100%);
 }
 .login-card {
   width: 380px;
@@ -3008,7 +3008,7 @@ body.resizing-v {
 .login-logo-text {
   font-size: 1.8rem;
   font-weight: 700;
-  background: linear-gradient(135deg, #a78bfa, #818cf8, #60a5fa);
+  background: linear-gradient(135deg, #7dd3fc, #38bdf8, #0ea5e9);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
@@ -3098,7 +3098,7 @@ body.resizing-v {
   padding: 13px 24px;
   border: none;
   border-radius: 10px;
-  background: linear-gradient(135deg, #7c3aed, #6366f1);
+  background: linear-gradient(135deg, #3b82f6, #2563eb);
   color: #fff;
   font-size: 0.95rem;
   font-weight: 600;
@@ -3124,7 +3124,7 @@ body.resizing-v {
 
 /* Light theme login */
 [data-theme="light"] .login-screen {
-  background: linear-gradient(135deg, #e0e7ff, #f0f5ff, #dbeafe);
+  background: linear-gradient(135deg, #dbeafe, #eff6ff, #bfdbfe);
 }
 [data-theme="light"] .login-card {
   background: rgba(255,255,255,0.9);
@@ -3226,8 +3226,8 @@ body.resizing-v {
   letter-spacing: 0.03em;
 }
 .admin-role-admin {
-  background: rgba(129,140,248,0.15);
+  background: rgba(59,130,246,0.15);
-  color: #818cf8;
+  color: #3b82f6;
 }
 .admin-role-user {
   background: rgba(34,197,94,0.12);