Migrate to electron-vite and electron-builder

- Switch from deprecated Vue CLI plugin to `electron-vite` (see
  nklayman/vue-cli-plugin-electron-builder#1982)
- Update main/preload scripts to use `index.cjs` filenames to support
  `"type": "module"`, resolving crash issue (#233). This crash was
  related to Electron not supporting ESM (see electron/asar#249,
  electron/electron#21457).
- This commit completes migration to Vite from Vue CLI (#230).

Structure changes:

- Introduce separate folders for Electron's main and preload processes.
- Move TypeHelpers to `src/` to mark tit as accessible by the rest of
  the code.

Config changes:

- Make `vite.config.ts` reusable by Electron configuration.
- On electron-builder, use `--publish` flag instead of `-p` for clarity.

Tests:

- Add log for preload script loading verification.
- Implement runtime environment sanity checks.
- Enhance logging in `check-desktop-runtime-errors`.

vite.config.ts

@@ -1,6 +1,6 @@
 /// <reference types="vitest" />
 import { resolve } from 'path';
-import { defineConfig } from 'vite';
+import { defineConfig, UserConfig } from 'vite';
 import legacy from '@vitejs/plugin-legacy';
 import vue from '@vitejs/plugin-vue2';
 import ViteYaml from '@modyfi/vite-plugin-yaml';
@@ -10,45 +10,53 @@ const WEB_DIRECTORY = resolve(getSelfDirectoryAbsolutePath(), 'src/presentation'
 const TEST_INITIALIZATION_FILE = resolve(getSelfDirectoryAbsolutePath(), 'tests/shared/bootstrap/setup.ts');
 const NODE_CORE_MODULES = ['os', 'child_process', 'fs', 'path'];
 
-export default defineConfig({
-  root: WEB_DIRECTORY,
-  plugins: [
-    vue(),
-    ViteYaml(),
-    legacy(),
-  ],
-  esbuild: {
-    supported: {
-      'top-level-await': true, // Exclude browsers not supporting top-level-await
-    },
-  },
-  define: {
-    ...getClientEnvironmentVariables(),
-  },
-  resolve: {
-    alias: {
-      ...getAliasesFromTsConfig(),
-    },
-  },
-  build: {
-    rollupOptions: {
-      // Ensure Node core modules are externalized and don't trigger warnings in browser builds
-      external: {
-        ...NODE_CORE_MODULES,
+export function createVueConfig(options?: {
+  readonly supportLegacyBrowsers: boolean,
+}): UserConfig {
+  return {
+    root: WEB_DIRECTORY,
+    plugins: [
+      vue(),
+      ViteYaml(),
+      ...[options?.supportLegacyBrowsers ? legacy() : undefined],
+    ],
+    esbuild: {
+      supported: {
+        'top-level-await': true, // Exclude browsers not supporting top-level-await
       },
     },
-  },
-  server: {
-    port: 3169,
-  },
-  test: {
-    globals: true,
-    environment: 'jsdom',
-    alias: {
-      ...getAliasesFromTsConfig(),
+    define: {
+      ...getClientEnvironmentVariables(),
     },
-    setupFiles: [
-      TEST_INITIALIZATION_FILE,
-    ],
-  },
-});
+    resolve: {
+      alias: {
+        ...getAliasesFromTsConfig(),
+      },
+    },
+    build: {
+      rollupOptions: {
+        // Ensure Node core modules are externalized and don't trigger warnings in browser builds
+        external: {
+          ...NODE_CORE_MODULES,
+        },
+      },
+    },
+    server: {
+      port: 3169,
+    },
+    test: {
+      globals: true,
+      environment: 'jsdom',
+      alias: {
+        ...getAliasesFromTsConfig(),
+      },
+      setupFiles: [
+        TEST_INITIALIZATION_FILE,
+      ],
+    },
+  };
+}
+
+export default defineConfig(createVueConfig({
+  supportLegacyBrowsers: true,
+}));