feat(quick-pane): persist default thinking level

ui/src/quick-pane/quick-pane.css

@@ -47,11 +47,13 @@ body {
   align-items: center;
 }
 
-.quick-pane-drag-strip {
+.quick-pane-drag-region {
   position: relative;
-  height: 8px;
-  flex: 0 0 8px;
-  cursor: move;
+  display: grid;
+  height: 24px;
+  flex: 0 0 24px;
+  place-items: center;
+  cursor: grab;
   touch-action: none;
   border-bottom: 1px solid #70522f;
   background: linear-gradient(
@@ -62,17 +64,20 @@ body {
   );
 }
 
-.quick-pane-drag-strip::after {
-  position: absolute;
-  top: 2px;
-  left: 50%;
+.quick-pane-drag-region:active {
+  cursor: grabbing;
+}
+
+.quick-pane-drag-grip {
   width: 44px;
-  height: 3px;
+  height: 5px;
   border-radius: 999px;
-  background: #f0a347;
+  background: repeating-linear-gradient(
+    90deg,
+    #f0a347 0 4px,
+    transparent 4px 7px
+  );
   box-shadow: 0 0 8px rgba(240, 163, 71, 0.45);
-  content: "";
-  transform: translateX(-50%);
 }
 
 .quick-pane-toolbar {