build(deps): upgrade web to SvelteKit 3 and vitest 5

Move the SvelteKit config into vite.config.js, replace the $lib alias with
#lib subpath imports (dropping the vitest alias), extend $app/tsconfig, and
pass asset() paths without a leading slash. Drop the @babel/core and js-yaml
overrides, which no longer match anything in the tree.

web/package.json

@@ -13,21 +13,22 @@
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
-    "@sveltejs/adapter-static": "^3.0.10",
-    "@sveltejs/kit": "^2.70.1",
+    "@sveltejs/adapter-static": "^4.0.0",
+    "@sveltejs/kit": "^3.0.0",
     "@sveltejs/vite-plugin-svelte": "^7.2.0",
     "@tailwindcss/vite": "^4.3.3",
     "eslint": "^10",
     "eslint-plugin-svelte": "^3.22.0",
     "globals": "^17.7.0",
-    "svelte": "^5.56.8",
+    "svelte": "^5.57.1",
     "tailwindcss": "^4.3.3",
     "vite": "^8.1.5",
-    "vitest": "^4.1.10"
+    "vitest": "^5.0.3"
   },
   "overrides": {
-    "@babel/core": "^7.29.7",
-    "js-yaml": "^4.3.0",
     "postcss": ">=8.5.16"
+  },
+  "imports": {
+    "#lib/*": "./src/lib/*"
   }
 }