fix: Update PWA manifest icon paths

- Fix icon path issues in manifest.json with proper relative paths
- Improve Progressive Web App installation reliability
- Ensure all icon resources are properly referenced

html/kidsai/manifest.json

@@ -9,17 +9,17 @@
   "orientation": "portrait-primary",
   "icons": [
     {
-      "src": "favicon-16x16.png",
+      "src": "./favicon-16x16.png",
       "sizes": "16x16",
       "type": "image/png"
     },
     {
-      "src": "favicon-32x32.png",
+      "src": "./favicon-32x32.png",
       "sizes": "32x32",
       "type": "image/png"
     },
     {
-      "src": "apple-touch-icon.png",
+      "src": "./apple-touch-icon.png",
       "sizes": "180x180",
       "type": "image/png",
       "purpose": "any maskable"