When the email-answered event fires (user just sent a reply, so the
source email auto-marks as done), the row was getting the .active
class instantly with no visible cue beyond the checkbox tick. Add a
brief .email-auto-done-flash class on the row that runs two keyframe
animations:
- email-auto-done-row: tints the row background with the accent for
~1.2s then fades to transparent.
- email-auto-done-check: pops the done checkbox to 1.4× with an
accent ring that expands outward over 0.6s.
Class self-removes after 1.2s so it doesn't replay on re-renders.
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