feat(islands): wire islands end to end

The island pieces existed but nothing connected .wrn compilation to island
emission. Now:

- codegen emits a data-wrn-island placeholder for component tags bound to
  .tsx imports, keeping .wrn components on the normal mount path
- the dev pipeline and static build resolve island imports, thread the
  names into codegen, and build the bundles
- collectScripts adds /__wrnexus/islands.js only when island markup is
  present, so island-free pages still ship nothing
- island routes classify as static-interactive via hasIslands

Three bugs found by driving a real page in the browser:

1. The mount runtime was never built anywhere, so the bootstrap 404'd and
   no island mounted.
2. Building the runtime separately from the islands gave each its own copy
   of React: "Cannot read properties of null (reading 'useState')". The
   runtime is now an entrypoint of the same build so React stays in one
   shared chunk. The existing single-React test only compared bundles
   within one build and could not see across build boundaries.
3. Island props arrived as attribute strings, so start={3} was "3" and
   incrementing produced "31" then "311". Props now follow JSX semantics:
   {…} parses as JSON, quoted values stay strings, and a runtime
   expression is a WRN-ISLAND-PROPS build error rather than a silent
   wrong value.

island-codegen.ts no longer imports @wrnexus/core. Compiler modules are
bundled into the Node-only VS Code extension, which contains no other
packages, so a runtime import of core broke the editor compiler; the two
helpers are implemented locally and the core dependency is dropped again.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/cli/src/mobile.ts

@@ -92,7 +92,7 @@ export async function generateMobile(appRoot: string, options: MobileOptions = {
     devDependencies: {
       "@capacitor/cli": "^8.0.0",
       "@capacitor/assets": "^3.0.0",
-      typescript: "^5.5.0",
+      typescript: "^6.0.3",
     },
   };
 
@@ -237,7 +237,7 @@ function generateNativeMobile(
       "react-native-safe-area-context": "^5.6.0",
       "react-native-screens": "^4.23.0",
     },
-    devDependencies: { "@types/react": "^19.2.0", typescript: "^5.9.0" },
+    devDependencies: { "@types/react": "^19.2.0", typescript: "^6.0.3" },
   };
   const expo = `import type { ExpoConfig } from "expo/config";\nimport appConfig from "../wrnexus.config.ts";\n\nconst mobile = appConfig.mobile ?? {};\nconst config: ExpoConfig = {\n  name: mobile.appName ?? ${JSON.stringify(name)},\n  slug: ${JSON.stringify(slug(name))},\n  scheme: mobile.scheme ?? ${JSON.stringify(scheme)},\n  ios: { bundleIdentifier: mobile.appId ?? ${JSON.stringify(appId)} },\n  android: { package: mobile.appId ?? ${JSON.stringify(appId)} },\n  plugins: ["expo-router"],\n  ...(mobile.expo ?? {}),\n};\nexport default config;\n`;
   const env = `/** Shared connection settings for native screens. */\nexport const API_URL = process.env.EXPO_PUBLIC_WRNEXUS_URL ?? ${JSON.stringify(apiUrl)};\nexport async function api<T>(path: string, init?: RequestInit): Promise<T> {\n  const response = await fetch(new URL(path, API_URL), init);\n  if (!response.ok) throw new Error(\`WrNexus request failed: \${response.status}\`);\n  return response.json() as Promise<T>;\n}\nexport function realtimeUrl(path: string): string {\n  const url = new URL(path, API_URL);\n  url.protocol = url.protocol === "https:" ? "wss:" : "ws:";\n  return url.toString();\n}\n`;