Wires the recently-merged question-completion-credits backend
(GET /api/credits) into the client for the first time: a new
CreditsService autoload fetches/caches the balance, and the embedded
credits field on first-answer responses updates it instantly with no
extra round trip. A shared CreditsBadge widget (star icon, balance,
decorative chevron per mockup) surfaces it in both the question
screen toolbar and the main shell header.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
hzandClaude Sonnet 5
efae7e0b2b