Claim badges directly from /account/badges (with confetti)

What shipped

• •/account/badges shows a real Claim button on each Ready-to-claim card. Click → cert issues → confetti → card flips to Earned with the issued date and the Add-to-LinkedIn button.
• •New Quiz pending section on /account/badges separates 'all guides read but quiz not yet passed' from 'ready to claim' — so the Claim button only appears when both gates are actually green.
• •Course-page Claim button (CourseCompletionBlock) also fires confetti on first issue. Re-renders of an already-earned badge don't re-celebrate — the burst only fires when the cert is genuinely new.