feat(calendar): add feed subscription, bulk export, share & Google Cal
- /api/kalender.ics SSR route: ICS feed of all calendar items (webcal-subscribable, Cache 1h) - buildICSFeed() / downloadICSFeed() for multi-event ICS export - googleCalUrl() deep-link pre-fills Google Calendar create form - Web Share API per event (navigator.share on mobile, clipboard fallback on desktop) — "Kopiert\!" toast per event for 2s after clipboard write - Actions bar (subscribe + bulk export) only rendered after onMount — Apple platforms: webcal:// link opens Calendar.app natively — All others: direct ICS download via <a download> Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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