.card-redact-btn had opacity:0 at rest (only opacity:1 on .card:hover), so
the ✏ redact button was completely invisible in the default grid/thumbnail
view — it only showed in list view, which forces opacity:1. Give it the same
0.35 baseline opacity as .card-delete-btn so it's discoverable at rest and
brightens on hover. The button was always rendered in the DOM; this is a
pure visibility fix.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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