Full implementation of ae_comp__exhibit_payment.svelte (was a 9-line stub).
Reads Stripe config from $ae_loc.site_cfg_json per-event. License tier
selector (1/3/6/10 users) uses {#key} remount pattern to work around
stripe-buy-button web component ignoring attribute changes after mount.
Three states: paid confirmation (priority=true), not-configured hint, payment
form. client_reference_id=exhibit_id ties payments to booth records.
TypeScript declaration for stripe-buy-button added to app.d.ts via
svelte/elements augmentation. exhibit_id prop wired in +page.svelte and
ae_tab__manage.svelte.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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