Typed digits in the segmented date field were unvalidated — you could
enter 60 for a day or 30 for a month. Now each digit is clamped to its
part's range and auto-advances:
- A digit that cannot validly extend the current part commits as a
zero-padded value and moves to the next part (month 9 → 09▶, day 6 →
06▶).
- An ambiguous digit that could still take a second stays pending
(month 1 → 01; then 2 → 12▶, or 9 → 09▶ dropping the overflowed 1).
- Day/month show a pending single digit zero-padded; the year part keeps
its existing right-fill placeholder display and 4-digit advance.
Logic lives in a pure applyDigit() helper; completion is normalized to a
full-width buffer so syncHiddenFromSegments commits it. Adds 10 e2e tests
covering clamping, auto-advance, overflow-drop, zero-pad display, the
single-digit commit invariant, and restart-on-full.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
lukas
c7c6491175
