Update favicon and enhance UI components for improved user experience

- Replaced PNG favicon with SVG for better scalability and visual quality across devices.
- Updated Vite configuration to include the new SVG favicon and adjusted asset paths.
- Enhanced various UI components with improved focus management and accessibility features.
- Introduced new styles to hide scrollbars while maintaining scroll functionality for a cleaner interface.

neode-ui/src/App.vue

@@ -100,9 +100,22 @@ function onUserActivity() {
 function onKeyDown(e: KeyboardEvent) {
   const isMac = navigator.platform.toUpperCase().includes('MAC')
   const mod = isMac ? e.metaKey : e.ctrlKey
-  if (mod && e.key === 'k') {
+  // Cmd+K / Ctrl+K or plain K (when not typing in input)
+  const target = e.target as HTMLElement
+  const isInput = target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.isContentEditable
+  if ((mod && e.key === 'k') || ((e.key === 'k' || e.key === 'K') && !isInput)) {
     e.preventDefault()
     spotlightStore.toggle()
+    return
+  }
+  // 's' key activates screensaver when authenticated (skip if typing in input)
+  if (e.key === 's' || e.key === 'S') {
+    const target = e.target as HTMLElement
+    const isInput = target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.isContentEditable
+    if (!isInput && appStore.isAuthenticated && !screensaverStore.isActive) {
+      e.preventDefault()
+      screensaverStore.activate()
+    }
   }
 }