fix(docs): pin the plugins picker controls bar to the frame top

Picker mode hides the navbar, so the sticky controls bar kept its 60px
navbar offset and floated over the first card row (found in live desktop
rig screenshots).

website/src/pages/plugins/styles.module.css

@@ -701,6 +701,13 @@
   padding-top: 0.5rem;
 }
 
+/* The navbar is hidden in picker mode, so the sticky controls bar must pin
+   to the frame top — its normal 60px navbar offset would float it over the
+   first card row. */
+.pickerMode .controlsBar {
+  top: 0;
+}
+
 :global(html):has(.pickerMode) :global(.navbar),
 :global(html):has(.pickerMode) :global(footer) {
   display: none;