fix(electron): restore packaged desktop app loading (#1095)

* fix(electron): restore packaged desktop app loading

Rebuild and verify Electron native modules before packaging and use the Vite base URL for packaged asset preloads.

* test(preload-utils): cover non-root base urls

scripts/verify-electron-native-modules.js

@@ -0,0 +1,44 @@
+import { spawnSync } from 'node:child_process';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+const electronBinary = require('electron');
+
+if (typeof electronBinary !== 'string' || electronBinary.length === 0) {
+  throw new Error('Failed to resolve the Electron executable for native-module verification');
+}
+
+const nativeModules = ['better-sqlite3'];
+const verificationScript = `
+console.log('electron modules', process.versions.modules);
+for (const moduleName of ${JSON.stringify(nativeModules)}) {
+  try {
+    require(moduleName);
+    console.log('native-ok', moduleName);
+  } catch (error) {
+    console.error('native-fail', moduleName);
+    console.error(error && error.stack ? error.stack : String(error));
+    process.exit(1);
+  }
+}
+`;
+
+const result = spawnSync(electronBinary, ['-e', verificationScript], {
+  encoding: 'utf8',
+  env: {
+    ...process.env,
+    ELECTRON_RUN_AS_NODE: '1',
+  },
+});
+
+if (result.stdout) {
+  process.stdout.write(result.stdout);
+}
+
+if (result.stderr) {
+  process.stderr.write(result.stderr);
+}
+
+if (result.status !== 0) {
+  throw new Error(`Electron native-module verification failed with exit code ${result.status ?? 'unknown'}`);
+}