vtool button and event summary support added on events page

[Anurajx]

Data for vtools is yet to be added

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Summary by cubic

Adds an event details modal on the Events page and vTools link support to improve event discovery and external references. Previously, the card’s primary button navigated to register/join; now on the Events page the card and primary button open a modal, with links available inside. Other pages keep the old behavior.

• EventCard: accepts optional onOpenDetails; when provided, the card becomes clickable and the primary button shows “View Details.” Click handlers stop propagation to avoid accidental modal toggles. No change where onOpenDetails is not used.
• New EventDetailsModal: shows description, dates, venue, category, organizers, prizes, contacts, and action links (register/livestream/URLs). Closes on Escape/backdrop and uses a portal to lock scroll.
• vTools support: adds optional vtool field to Event and a getVtoolHref utility to normalize URLs; modal shows an “Open in vTools” button when present. Action: populate vtool URLs in event data when available.
• Minor: hero typography updated for emphasis (bold instead of italic).

^{Written for commit 158406c. Summary will update on new commits.}

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