Adds a client-side fuzzy product search to the design system:
- `src/api/products.js`: fixture catalogue (22 products across the Kaiser
Natron, Holste, Gazelle, Grüne Tante and Linda ranges) plus a scored,
diacritic-folded search (ß→ss, ä→ae, NFKD) with weighted fields
(title 5, brand/keywords 3, size/category 2, id 1) and prefix bonus.
- `Search.vue`: tone-driven (brand/paper/cream) full-screen overlay on
mobile, centered modal on md+. Auto-focus, arrow-key nav, Enter/Esc,
suggested-products empty state, keyboard-hint footer on desktop, safe-
area aware, scroll-locks the document while open.
- Navbar now hosts two triggers: a pill-shaped "Search products"
lookalike (desktop, in the same LanguageSwitcher-style container) and
a green/accent shadow-sm floating button bottom-left on mobile. Both
open the same overlay.
- HomePage feeds the products list into Navbar.
- Design-system showcase (`/design/search`) with live demo + canned
result preview + usage snippet. Sidebar + mobile bottom-nav entries
and DE/EN i18n added.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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