fix: WhatsApp community link points at Comunidade 2

[thomgabriel]

Pedro flagged that the community link on the LP, hub and Vibeathon page opened the announcements channel. Swapped for the Comunidade 2 invite in the shared constant and the Vibeathon seed; the edition rows in the database are updated in place.

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Project	Deployment	Actions	Updated
hackathon-platform	Ready	Preview	Sep 4, 2026 3:37pm UTC

[claude]

Claude finished @thomgabriel's task in 39s —— View job

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Review: safe to merge

Checked against CLAUDE.md priorities (auth, data safety, correctness, analytics, conventions). No findings.

• WHATSAPP_COMMUNITY_URL is a single shared constant consumed by page.tsx, pre-registro/page.tsx, and h/page.tsx — all three surfaces pick up the new link automatically, no stray hardcoded copies of the old URL remain in shipped code.

• supabase/migrations/00056_vibeathon_edition.sql seed insert is guarded by where not exists (select 1 from public.hackathons where slug = ...), so it stays idempotent/re-runnable; editing the literal here only affects fresh installs, consistent with the PR description noting the already-applied production rows were updated separately.

• No service-role writes, RLS, or auth surfaces touched — pure data/string change.

• Get diff and read changed files

• Check against CLAUDE.md priorities

• Post findings