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`.

tests/unit/shared/Stubs/SanityValidatorStub.ts

@@ -0,0 +1,29 @@
+import { ISanityCheckOptions } from '@/infrastructure/RuntimeSanity/ISanityCheckOptions';
+import { ISanityValidator } from '@/infrastructure/RuntimeSanity/ISanityValidator';
+
+export class SanityValidatorStub implements ISanityValidator {
+  public shouldValidateArgs = new Array<ISanityCheckOptions>();
+
+  private errors: readonly string[] = [];
+
+  private shouldValidateResult = true;
+
+  public shouldValidate(options: ISanityCheckOptions): boolean {
+    this.shouldValidateArgs.push(options);
+    return this.shouldValidateResult;
+  }
+
+  public collectErrors(): Iterable<string> {
+    return this.errors;
+  }
+
+  public withErrorsResult(errors: readonly string[]): this {
+    this.errors = errors;
+    return this;
+  }
+
+  public withShouldValidateResult(shouldValidate: boolean): this {
+    this.shouldValidateResult = shouldValidate;
+    return this;
+  }
+}