feat: add show/hide locked toggle to all panels

apps/web/src/styles.css

@@ -1107,6 +1107,47 @@ body {
   font-size: 0.85rem;
 }
 
+/* ── Panel Header (title + lock toggle row) ────────────────────────────── */
+
+.panel-header {
+  align-items: center;
+  display: flex;
+  gap: 1rem;
+  justify-content: space-between;
+  margin-bottom: 0.25rem;
+}
+
+.panel-header h2 {
+  margin: 0;
+}
+
+.lock-toggle {
+  align-items: center;
+  background: rgba(255, 255, 255, 0.06);
+  border: 1px solid rgba(147, 51, 234, 0.3);
+  border-radius: 1rem;
+  color: var(--colour-text-muted);
+  cursor: pointer;
+  display: flex;
+  font-family: inherit;
+  font-size: 0.75rem;
+  gap: 0.3rem;
+  padding: 0.3rem 0.75rem;
+  transition: all 0.2s;
+  white-space: nowrap;
+}
+
+.lock-toggle:hover {
+  background: rgba(147, 51, 234, 0.15);
+  border-color: rgba(147, 51, 234, 0.6);
+  color: var(--colour-text);
+}
+
+.lock-toggle-on {
+  border-color: rgba(147, 51, 234, 0.5);
+  color: var(--colour-text);
+}
+
 /* ── Zone Selector ─────────────────────────────────────────────────────── */
 
 .zone-selector {