feat(web): summary preview under each list card

Render a muted one-line lede beneath the title/meta of each summary
card via previewText(r.Summary, 160). New .card-preview token clamps to
one line. Regenerated views_templ.go committed (CI has no templ binary).

internal/web/views.templ

@@ -75,6 +75,9 @@ templ summaryList(rows []store.SummaryRow) {
 					if cardMeta(r) != "" {
 						<div class="card-meta">{ cardMeta(r) }</div>
 					}
+					if p := previewText(r.Summary, 160); p != "" {
+						<div class="card-preview">{ p }</div>
+					}
 					<div class="card-foot">
 						if r.AIProvider != "" {
 							<span class="chip">{ r.AIProvider }</span>