Make Watch insights cards match in height

Most played rows carry a two-line title+username layout while Top
viewers/TV/movies rows are single-line, so the two card rows ended up
visibly different heights even though each pair matched within its own
row. Give .top-item a fixed min-height so every row — and therefore
every card, all four hold exactly 3 items — lines up the same.

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

templates/dashboard.html

@@ -563,6 +563,7 @@
       display: flex;
       align-items: center;
       gap: 0.65rem;
+      min-height: 3.25rem;
       padding: 0.5rem 0.65rem;
       background: var(--surface-2);
       border: 1px solid var(--border);