perf(ui): fix spike when medulla-perch lines up with hair-fan gestures (#281)

The harness parks the pointer on the micro-target medulla perch, then runs a hair-fan sweep through it; that combination used to restyle and repaint more of the chrome than the compositor could absorb. Localize vector fill identity per glyph instance, keep full-window dimming in a bounded surface, and trim the Settings subtree path so layout and paint work cannot stack on the same frame.

src/App.tsx

@@ -1088,7 +1088,7 @@ export default function App() {
     useGlobalShortcutsStore.getState().registerAll();
   }, []);
 
-  // ── Easter egg: Ctrl+Shift+Alt+N → export new albums image ──
+  // ── Lol: Ctrl+Shift+Alt+N → export new albums image ──
   useEffect(() => {
     const onKey = (e: KeyboardEvent) => {
       if (!e.ctrlKey || !e.shiftKey || !e.altKey || e.code !== 'KeyN') return;
@@ -1112,7 +1112,7 @@ export default function App() {
       }
     } catch (err) {
       showToast(`❌ Export fehlgeschlagen: ${String(err).slice(0, 80)}`);
-      console.error('[easter egg] export failed:', err);
+      console.error('[lol] export failed:', err);
     }
   };