Scaffold Svelte frontend and browser test matrix

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

web/tools/svelte-check/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "@remora/svelte-check-compat",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "check": "svelte-check --workspace ../.. --tsconfig ./tsconfig.app.json"
+  },
+  "devDependencies": {
+    "svelte": "5.56.5",
+    "svelte-check": "4.7.2",
+    "typescript": "6.0.3"
+  }
+}