The v5.0.0 React UI redesign shipped without a working dev workflow —
`npm start` only ran `electron .` which loaded the source index.html
that references raw .tsx files. The browser couldn't execute them, so
the app rendered an empty #root and the user saw 'lot of errors'.
This commit restores a real dev workflow:
1. **Vite dev server wired into npm scripts** — added `concurrently`
+ `wait-on` as devDeps. `npm run dev` now runs Vite (port 5173)
and Electron together with `wait-on tcp:5173` so Electron only
starts after the dev server is ready.
2. **Main process loads Vite URL in dev, dist/ in prod** — window
module now checks `process.env.VITE_DEV_SERVER_URL` and
`app.isPackaged` to decide what to load. Production still
loads the built `dist/renderer/index.html`.
3. **Fixed ReferenceError: app is not defined** — window module
referenced `app.isPackaged` but only imported `BrowserWindow`.
Added `app` to the destructured import.
4. **Fixed wrong icon path** — window creation used
`../../assets/icon.png` from src/main/window/ which resolved
to `src/assets/icon.png` (doesn't exist). Icon lives at
project root, so path is now `../../../assets/icon.png`.
5. **Allowed Google Fonts in CSP** — the strict CSP
(`font-src 'self' data:`, `connect-src 'self'`) blocked
the preconnect/css link to fonts.googleapis.com / .gstatic.com.
Added both domains so Plus Jakarta Sans loads.
6. **Renamed onLayout → onLayoutChange** in AppShell — react-resizable-panels
v4 renamed the prop. The v1 name was being spread to a DOM
div and React logged 'Unknown event handler property' warnings.
Test mock updated for parity.
7. **show: false → show: true** — ready-to-show was hanging on
this Wayland/container combo. Now the window is shown
immediately on create.
Verified end-to-end:
- 305/305 vitest tests pass
- Vite dev server starts on :5173
- Electron loads localhost:5173 and React mounts
- Header 'MarkdownConverter' + sidebar with 'No files open' visible
- No onLayout warnings after HMR
- All blocked errors resolved
- 5 functional buttons: Open file, Open folder, Save, Toggle sidebar, Toggle preview
- each dispatches via useCommandStore
- aria-pressed on toggle buttons reflects app store state
- formatting buttons (bold, italic, etc.) stay disabled (Phase 9)
- toolbar now has role='toolbar' and aria-label
- TDD: 9 component tests
- Renders tabs from useFileStore.openTabs with title + dirty dot + close button
- Uses Zustand selectors for granular re-renders
- Active tab highlighted with aria-current and accent background
- Close button stops propagation; does not trigger tab activation
- Horizontal scroll on overflow, h-9 fixed bar with border
- Empty state preserved when no tabs open
Tests: 6 cases (empty, render, highlight, click-switch, click-close, dirty indicator)
- 75 total tests (was 70, gained 5 new)
- All pass
- Build: succeeds
Amit Haridas
amitwh
Amit Haridas