Scaffold Svelte frontend and browser test matrix

Establish the TypeScript 7, Oxlint, Vitest, and Playwright workspace with an isolated Svelte diagnostics compatibility boundary.

web/tsconfig.app.json

@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "allowImportingTsExtensions": true,
+    "composite": true,
+    "isolatedModules": true,
+    "lib": ["ES2024", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "moduleResolution": "Bundler",
+    "noEmit": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "target": "ES2024",
+    "tsBuildInfoFile": "./.cache/tsconfig.app.tsbuildinfo",
+    "types": ["vite/client"]
+  },
+  "include": ["src/**/*.ts", "src/**/*.svelte"]
+}