Initial commit: Tina Barcelona trip picker

Static Cloudflare Pages site + KV-backed Pages Function for jointly
planning Tina's Barcelona visit (7 Jul - 18 Aug 2026). List and calendar
views share one client state; dated evening events are radio groups to
prevent double-booking, multi-night shows live once in TRIP_DATA.spanning
instead of being duplicated per day, and undated collections get
optionally date-tagged when picked from the calendar view.

Includes a client-side-only password gate and an instructions page.
Live at https://summeroffun.hortal.me.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

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