refactor: migrate app.config and Expo config plugins to TypeScript

Migrate the dynamic Expo config and all 12 local config plugins from
CommonJS .js to typed TypeScript:

- app.config.js -> app.config.ts (typed ConfigContext/ExpoConfig,
  behavior-identical port)
- plugins/*.js -> plugins/*.ts with `ConfigPlugin` typings from
  expo/config-plugins; plugin options are now type-checked (withGitPod)
- app.json plugin references updated to the .ts paths
- imports unified on expo/config-plugins (some plugins used the
  @expo/config-plugins alias)

Node evaluates the config at prebuild time and cannot parse TypeScript
plugin modules on its own (verified empirically: Expo transpiles
app.config.ts itself but not its imports), so the documented tsx
approach is used: `import "tsx/cjs"` at the top of app.config.ts plus
tsx as a devDependency.

Validation: resolved prebuild configs (expo config --type prebuild) are
byte-identical to the old JS config for both mobile and TV (modulo
plugin path extensions and the builtAt timestamp); full
`bun run prebuild` and `bun run prebuild:tv` pass and all Android
plugin mods are present in the generated project (media3 exclusions,
gradle properties, cast activity, network security config, alert
colors).

plugins/withTrustLocalCerts.ts

@@ -0,0 +1,59 @@
+import fs from "node:fs";
+import path from "node:path";
+import {
+  AndroidConfig,
+  type ConfigPlugin,
+  type ExportedConfigWithProps,
+  withAndroidManifest,
+} from "expo/config-plugins";
+
+const fsPromises = fs.promises;
+
+const { getMainApplicationOrThrow } = AndroidConfig.Manifest;
+
+type AndroidManifest = AndroidConfig.Manifest.AndroidManifest;
+
+const withTrustLocalCerts: ConfigPlugin = (config) => {
+  return withAndroidManifest(config, async (mod) => {
+    mod.modResults = await setCustomConfigAsync(mod, mod.modResults);
+    return mod;
+  });
+};
+
+async function setCustomConfigAsync(
+  config: ExportedConfigWithProps<AndroidManifest>,
+  androidManifest: AndroidManifest,
+): Promise<AndroidManifest> {
+  const src_file_path = path.join(__dirname, "network_security_config.xml");
+  const res_file_path = path.join(
+    await AndroidConfig.Paths.getResourceFolderAsync(
+      config.modRequest.projectRoot,
+    ),
+    "xml",
+    "network_security_config.xml",
+  );
+
+  const res_dir = path.resolve(res_file_path, "..");
+
+  if (!fs.existsSync(res_dir)) {
+    await fsPromises.mkdir(res_dir);
+  }
+
+  try {
+    await fsPromises.copyFile(src_file_path, res_file_path);
+  } catch (e) {
+    throw new Error(
+      `Failed to copy network security config file from ${src_file_path} to ${res_file_path}. [Hint: Check Android write permissions and file paths]`,
+      { cause: e },
+    );
+  }
+  const mainApplication = getMainApplicationOrThrow(androidManifest);
+  if (!mainApplication.$["android:networkSecurityConfig"]) {
+    mainApplication.$["android:networkSecurityConfig"] =
+      "@xml/network_security_config";
+  }
+
+  return androidManifest;
+}
+
+export default withTrustLocalCerts;