ui: handles appear after 500ms hover dwell, subtler styling

src/ui.tsx

@@ -277,22 +277,30 @@ function Plugin () {
 
   const [isMaxToggled, setIsMaxToggled] = useState(false)
   // Resize-handle visibility is state-driven (not CSS :hover/:has) for Figma webview
-  // reliability: show all handles when the window or any handle is hovered; hoveredHandle
-  // tracks the one under the cursor, rendered brighter.
+  // reliability. Handles appear only after the cursor has rested in the window for 500ms
+  // (so they don't flash while just passing through); the handle under the cursor is
+  // rendered a touch brighter than the others.
   const [rootHover, setRootHover] = useState(false)
   const [hoveredHandle, setHoveredHandle] = useState<string | null>(null)
-  const handleVisible = rootHover || hoveredHandle !== null
+  const [handlesShown, setHandlesShown] = useState(false)
+  useEffect(function () {
+    if (rootHover) {
+      const t = setTimeout(function () { setHandlesShown(true) }, 500)
+      return function () { clearTimeout(t) }
+    }
+    setHandlesShown(false)
+  }, [rootHover])
   function hitboxStyle (dir: string, pos: { [k: string]: number | string }) {
     const active = hoveredHandle === dir
     return {
       ...pos,
       position: 'fixed',
       zIndex: 3,
-      opacity: handleVisible ? 1 : 0,
-      background: active ? 'rgba(255,255,255,0.95)' : 'rgba(255,255,255,0.5)',
-      border: '1.5px solid ' + (active ? 'rgba(80,80,80,1)' : 'rgba(110,110,110,0.9)'),
+      opacity: handlesShown ? 1 : 0,
+      background: active ? 'rgba(255,255,255,0.6)' : 'rgba(255,255,255,0.3)',
+      border: '1px solid ' + (active ? 'rgba(90,90,90,0.85)' : 'rgba(120,120,120,0.6)'),
       borderRadius: 4,
-      transition: 'opacity 120ms ease, background 120ms ease, border-color 120ms ease'
+      transition: 'opacity 150ms ease, background 150ms ease, border-color 150ms ease'
     } as any
   }
   // "Maximized" flag drives the icon (expand/collapse). Real size after maximize is