feat(giveback): wire suggest-a-cause submission flow

[idoshamun]

What

Replaces the placeholder "Suggest now" reveal CTA with a real cause-nomination flow.

• New GivebackSuggestCauseForm (required cause URL + optional note → "we'll review it" confirmation) and GivebackSuggestCauseModal.
• useSuggestContributionCause hook + suggestContributionCause mutation.
• Two entry points, both gated on the new featureGivebackSuggestCause flag (default off):
  • the reward reveal's "Suggest now" now opens the form inline (dismisses when the flag is off);
  • a persistent "Suggest a cause" prompt on the Causes tab.

Backend: dailydotdev/daily-api#TBD (add suggestContributionCause).

Notes

• Set the flag to match the reward's feature-access cohort.
• Backend enforces the suggest_causes feature access, so the flag leaking can't bypass authorization.

Test plan

• Form spec (submit disabled until valid URL, submits url+note, omits empty note)
• Strict typecheck + lint clean

Preview domain

https://feat-giveback-suggest-cause.preview.app.daily.dev

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
daily-webapp	Error		Jul 8, 2026 10:44am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
storybook	Ignored		Jul 8, 2026 10:44am