checkmark.seal.fill (unused elsewhere, reads as a generic 'AI verified badge')
replaced with checkmark.circle.fill, the app's actual convention. All four
state-changing card actions (Finish Anyway, Check All Sets, Clear All Sets,
Didn't Train) now confirm via one PendingAction enum + confirmationDialog
before executing, each with a tailored message; destructive ones use the
.destructive role. The header menu's Clear All Sets (any completion level)
also now confirms instead of executing instantly.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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