v0.7.2: Translation hotfix

Translation hotfix. The packaged 0.7.0 and 0.7.1 apps shipped without their English and Polish strings, so the interface showed raw translation keys (cta.begin, hw.title) instead of text. Development builds were fine, which is why it slipped through. This release restores both languages and changes nothing else about how the app behaves.

Fixed

• Translations missing from release builds (0.7.0, 0.7.1). The renderer entry loads the i18next bootstrap through a bare side-effect import, but apps/web/package.json has declared only CSS as having side effects since 0.1.0. When i18n landed in 0.7.0, the production bundler treated lib/i18n.ts as side-effect free and dropped it, locale resources included. ./src/lib/i18n.ts is now listed in sideEffects, and the packaged renderer contains both locales again.

Added

• pnpm showcase regenerates the README screenshots and banners with @noctcore/showcase-kit. It builds the renderer alone in a showcase Vite mode with an invented stand-in for the Electron bridge (made-up files, a fixed GPU probe, frozen encode numbers), so no real files or hardware appear on screen. None of it is included in normal builds.
• data-testid hooks on the titlebar, sidebar, onboarding, Settings and Extract screens, so automated captures don't depend on translated labels.

Changed

• README rewritten with a hero banner, screenshots of every main screen, a feature table checked against the code and an up-to-date stack. A Polish README.pl.md sits alongside it.
• New dev dependencies: @noctcore/showcase-kit 0.3.0 and playwright 1.63.0, both pinned exactly. Nothing new ships in the app.

Removed

• The old CDP screenshot script (scripts/screenshot-app.mjs) and the assets/screenshots/ images it produced, replaced by pnpm showcase.