Replace Parcel 1 with Vite (#353)

Swap the unmaintained parcel-bundler@1.x for Vite's build API, called
from the same generateAssets hook. Output layout is unchanged
(dist/src/main/main.js + dist/static/index.html + dist/renderer.{js,css})
so no runtime path changes — __dirname-based asset lookup, loadFile, and
packagerConfig.ignore all keep working.

Renderer is built in lib/CJS mode with Node builtins + electron
externalized; a one-line banner aliases exports=module.exports since the
Electron <script> context provides module/require but not a bare exports
global. CSS (98.css + root.css) is now imported from app.tsx so Vite
emits a single renderer.css with fonts inlined.

Drops parcel-bundler and rimraf (vite-build clears dist/ itself).
~800ms full build.

tools/generateAssets.js

@@ -1,7 +1,7 @@
 /* tslint:disable */
 
-const { compileParcel } = require('./parcel-build')
+const { compileVite } = require('./vite-build')
 
 module.exports = async () => {
-  await Promise.all([compileParcel()])
+  await compileVite()
 }