Client-side i18n system with localStorage persistence:
- Shared i18n module (frontend/src/client/i18n.ts) with 120+ translation keys
- Language toggle buttons in header on all pages (including login)
- data-i18n attributes on all static translatable elements
- t() function for dynamically rendered content (calculator results, timeline)
- onLangChange callbacks re-render dynamic content on language switch
- Date formatting adapts locale (de-DE / en-GB) per language
- Replaces old dual-display pattern (card-en spans) with single-language switching
Go deadline engine (internal/calc/):
- 9 proceeding types: UPC (INF/REV/PI/APP), DE (INF/NULL), EPA (OPP/APP/GRANT)
- ~50 deadline rules with durations, parties, rule references
- German federal holiday computation (Easter via Anonymous Gregorian)
- Weekend/holiday adjustment with transparency (original vs adjusted dates)
- 8 unit tests covering holidays, adjustment, and full deadline chains
Frontend (Bun/TSX):
- 3-step wizard: select proceeding → enter date → view timeline
- Visual timeline with party badges, rule references, adjustment warnings
- Print-friendly layout
API: POST /api/tools/fristenrechner (protected, JSON)
GET /api/tools/proceeding-types (protected, JSON)
Route: GET /tools/fristenrechner (protected page)
Home page: Added "Werkzeuge" section with cards linking to both tools
Replace Go HTML template rendering with a Bun + TSX build-time static
site generator. Go backend becomes API-only for auth.
Frontend:
- Custom JSX-to-HTML-string factory (zero dependencies)
- TSX components for Header, Footer, index page, login page
- Client-side login.ts handles tab switching and fetch()-based auth
- Bun bundler compiles client JS, build.ts renders pages to dist/
Backend:
- Auth handlers return JSON (POST /api/login, POST /api/register)
- Login page served as static HTML from dist/
- Static assets served from /assets/ (public)
- Auth middleware unchanged (cookie check, redirect to /login)
- Removed template parsing and renderPage
Dockerfile:
- 3-stage build: Bun frontend -> Go backend -> alpine runtime
- Frontend dist copied to /app/dist in final image
Removed: templates/, static/css/ (replaced by frontend/)
