Explore card rows: match the kanban card's hover style

.card-row now highlights its border-color on hover, same as
.kanban-card, instead of tinting .card-row__link's background --
a card should look the same hovered whichever view shows it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/style.css

@@ -548,6 +548,12 @@ h1 {
   background: var(--surface);
 }
 
+/* Same hover treatment as .kanban-card -- just the border, no background
+   tint -- since a card looks the same card whichever view it's shown in. */
+.card-row:hover {
+  border-color: var(--accent);
+}
+
 /* Wraps the text + status badge -- the whole row is a link to the card's own
    view, except the delete button (a sibling, so it isn't nested inside it). */
 .card-row__link {
@@ -562,10 +568,6 @@ h1 {
   text-decoration: none;
 }
 
-.card-row__link:hover {
-  background: var(--bg);
-}
-
 .card-row__text {
   flex: 1;
   min-width: 0;