Presentational DailyRewardSheet (7 cells, today highlighted, reward icons
from the calendar table, claim + watch-ad-2x buttons). HomeScreen becomes a
ConsumerStatefulWidget that shows it once per mount via a post-frame guard;
the 2x path grants the doubled reward only if the rewarded ad was earned,
else the base reward. Guards the throwing saveRepositoryProvider default so
a repo-less mount is a no-op.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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