Add region filter bar and navigation buttons for video clips

static/css/style.css

@@ -95,6 +95,50 @@ header {
   width: 100%;
 }
 
+/* Region filter bar */
+.region-bar {
+  width: 100%;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+  padding: 0 4px;
+}
+
+.region-label {
+  font-size: 12px;
+  color: var(--text-muted);
+  text-transform: uppercase;
+  letter-spacing: 1px;
+  font-weight: 600;
+}
+
+.region-btn {
+  padding: 5px 14px;
+  border: 1px solid var(--border);
+  border-radius: 20px;
+  background: var(--bg-secondary);
+  color: var(--text-secondary);
+  font-size: 13px;
+  cursor: pointer;
+  transition:
+    background 0.15s,
+    color 0.15s,
+    border-color 0.15s;
+  font-family: var(--font);
+}
+
+.region-btn:hover {
+  border-color: var(--accent);
+  color: var(--text-primary);
+}
+
+.region-btn.active {
+  background: var(--accent);
+  color: #fff;
+  border-color: var(--accent);
+}
+
 /* Video Player Section */
 .player-panel {
   width: 100%;
@@ -182,7 +226,7 @@ header {
   color: var(--text-secondary);
   padding: 0 4px;
   display: flex;
-  justify-content: space-between;
+  justify-content: flex-start;
   align-items: center;
   gap: 10px;
   flex-wrap: wrap;
@@ -194,6 +238,48 @@ header {
   color: var(--accent);
   font-variant-numeric: tabular-nums;
 }
+.now-playing .loc {
+  color: var(--text-muted);
+  font-size: 12px;
+  margin-left: auto;
+}
+.now-playing .loc::before {
+  content: "📍 ";
+  font-size: 11px;
+}
+
+/* Nav buttons (prev/next) */
+.nav-btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--bg-tertiary);
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition:
+    background 0.15s,
+    color 0.15s,
+    border-color 0.15s;
+  flex-shrink: 0;
+  padding: 0;
+}
+.nav-btn svg {
+  width: 16px;
+  height: 16px;
+}
+.nav-btn:hover {
+  background: var(--bg-elevated);
+  color: var(--text-primary);
+  border-color: var(--accent);
+}
+.nav-btn:active {
+  background: var(--accent);
+  color: #fff;
+}
 
 /* =============================================
    Camera Selector: 3-column grid + car graphic