feat: Introduce Shaarli Professional Theme with a modern sidebar layout and light/dark mode.

shaarli-pro/css/style.css

@@ -3113,3 +3113,62 @@ select:focus {
 .header-action-btn.has-active-filter {
     background: rgba(239, 68, 68, 0.2);
 }
+
+/* Filter Info Banner */
+.filter-info-banner {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
+    color: white;
+    padding: 0.75rem 1.25rem;
+    border-radius: 8px;
+    margin: 1rem 0;
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
+}
+
+.filter-info-banner.empty-results {
+    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
+}
+
+.filter-info-content {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    font-size: 0.95rem;
+}
+
+.filter-info-content i {
+    font-size: 1.25rem;
+    opacity: 0.9;
+}
+
+.filter-info-content strong {
+    background: rgba(255, 255, 255, 0.25);
+    padding: 0.15rem 0.5rem;
+    border-radius: 4px;
+    font-weight: 600;
+}
+
+.filter-clear-btn {
+    display: flex;
+    align-items: center;
+    gap: 0.35rem;
+    background: rgba(255, 255, 255, 0.2);
+    border: 1px solid rgba(255, 255, 255, 0.3);
+    color: white;
+    padding: 0.4rem 0.75rem;
+    border-radius: 6px;
+    cursor: pointer;
+    font-size: 0.85rem;
+    font-weight: 500;
+    transition: background 0.2s ease;
+}
+
+.filter-clear-btn:hover {
+    background: rgba(255, 255, 255, 0.35);
+}
+
+.filter-clear-btn i {
+    font-size: 1rem;
+}