feat: redesign settings page with sidebar navigation and improved layout

styles.css

@@ -450,7 +450,181 @@ pre {
   transform: none;
 }
 
-/* ═══ Settings Page ═══ */
+/* ═══ Settings Page – Sidebar Layout ═══ */
+.settings-layout {
+  display: grid;
+  grid-template-columns: 200px 1fr;
+  gap: 24px;
+  align-items: start;
+}
+
+.settings-sidebar {
+  background: rgba(0, 0, 0, 0.25);
+  border: 1px solid var(--glass-border);
+  border-radius: 16px;
+  padding: 12px;
+  position: sticky;
+  top: 20px;
+}
+
+.settings-sidebar-header {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding: 10px 12px 14px;
+  font-weight: 700;
+  font-size: 0.9rem;
+  color: var(--text-dim);
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  border-bottom: 1px solid var(--glass-border);
+  margin-bottom: 8px;
+}
+
+.settings-sidebar-header i {
+  color: var(--primary);
+  width: 16px;
+  height: 16px;
+}
+
+.settings-nav-btn {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  width: 100%;
+  padding: 11px 14px;
+  border: none;
+  background: transparent;
+  color: var(--text-dim);
+  font-weight: 600;
+  font-size: 0.88rem;
+  border-radius: 10px;
+  cursor: pointer;
+  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+  text-align: left;
+}
+
+.settings-nav-btn i {
+  width: 16px;
+  height: 16px;
+  flex-shrink: 0;
+  transition: color 0.2s;
+}
+
+.settings-nav-btn:hover {
+  background: rgba(255, 255, 255, 0.06);
+  color: var(--text);
+}
+
+.settings-nav-btn.active {
+  background: rgba(99, 102, 241, 0.15);
+  color: var(--text);
+  border-left: 3px solid var(--primary);
+  padding-left: 11px;
+}
+
+.settings-nav-btn.active i {
+  color: var(--primary);
+}
+
+.settings-content {
+  min-width: 0;
+}
+
+.settings-section {
+  animation: fadeIn 0.2s ease-out;
+}
+
+.settings-section-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  margin-bottom: 24px;
+  padding-bottom: 16px;
+  border-bottom: 1px solid var(--glass-border);
+}
+
+.settings-section-header h2 {
+  font-size: 1.4rem;
+  font-weight: 700;
+  margin-bottom: 6px;
+}
+
+.settings-section-sub {
+  font-size: 0.9rem;
+  font-weight: 400;
+  color: var(--text-dim);
+}
+
+/* ═══ Watcher Banner ═══ */
+.watcher-banner {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  background: rgba(0, 0, 0, 0.25);
+  border: 1px solid var(--glass-border);
+  border-radius: 14px;
+  padding: 14px 20px;
+  margin-bottom: 20px;
+  transition: border-color 0.3s, background 0.3s;
+}
+
+.watcher-banner.running {
+  background: rgba(34, 197, 94, 0.06);
+  border-color: rgba(34, 197, 94, 0.35);
+}
+
+.watcher-banner.paused {
+  background: rgba(234, 179, 8, 0.06);
+  border-color: rgba(234, 179, 8, 0.35);
+}
+
+.watcher-banner-left {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  font-weight: 600;
+  font-size: 1rem;
+}
+
+/* ═══ Section Panel (sub-card) ═══ */
+.section-panel {
+  background: rgba(0, 0, 0, 0.2);
+  border: 1px solid var(--glass-border);
+  border-radius: 14px;
+  padding: 20px;
+}
+
+.section-panel-header {
+  display: flex;
+  align-items: flex-start;
+  gap: 14px;
+  margin-bottom: 4px;
+}
+
+.section-panel-header > i {
+  color: var(--primary);
+  margin-top: 4px;
+  flex-shrink: 0;
+  width: 18px;
+  height: 18px;
+}
+
+.section-panel-header h3 {
+  font-size: 1rem;
+  font-weight: 700;
+  margin-bottom: 4px;
+}
+
+/* ═══ 3-column folder grid ═══ */
+.settings-grid-3 {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 16px;
+  margin-bottom: 20px;
+}
+
+/* ═══ Settings Title (legacy – kept for History page) ═══ */
 .settings-title {
   display: flex;
   align-items: center;