feat(sharing): publish and compare bracket picks

[avatarneil]

Owners can explicitly publish a read-only snapshot, copy its link, publish later changes, or revoke access. Private edits never silently change the published snapshot, and publishing after revocation creates a new address.

Friends can view shared picks without signing in and compare them with their own saved brackets after signing in. Comparisons match advancing teams by conference and round, accounting for reseeding. Completed results provide informal correct-pick counts; picks remain editable.

Also fixes a startup race that could reset guest input when Clerk finished loading, and prevents edits during save/share requests.

Validation:

• Production build and TypeScript passed; lint has no errors (seven existing warnings).
• Nine unit/database tests passed against Neon, including owner isolation and snapshot revocation.
• Six public-sharing browser checks passed across desktop, mobile, and tablet.
• Guest welcome/save checks passed after the startup fix; existing bracket-selection checks passed.
• A temporary Clerk development user completed save, publish, private-edit isolation, comparison, and revocation against the local app and Neon. Test user and records were removed.

Production hosting still needs Neon environment configuration and migration execution before rollout. No production deployment or merge was performed.

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Project	Deployment	Actions	Updated
nfl-playoff-bracket	Ready	Preview	Sep 14, 2026 12:56am UTC