Make the remove confirm name the stake and take a thumb

The one irreversible path was defended with 40px buttons 8px apart and a
question — "Remove this?" — that never said what was leaving or what it cost.

Confirm buttons go to 46px with a 12px gap (all three rows), and the remove
question names the series and the loss. The row wraps, so a long title takes
the width it needs instead of overflowing; verified at 320 and 390 in both
themes with a 90-character title.

Button order is unchanged: the group is right-aligned with Cancel outermost, so
the destructive button already sits further from a right thumb's arc than
Cancel does, and all three rows keep the same shape.

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

backend/templates/card.html

@@ -122,7 +122,7 @@
   </div>
   {{end}}
   <div class="confirm-row" id="confirm-remove-{{.Key}}" role="group" aria-live="polite" hidden>
-    <span>Remove this?</span>
+    <span>Remove “{{.Title}}”? Chapter progress is lost.</span>
     <div>
       <button class="danger-solid"
               hx-delete="/ui/bookmarks/{{.Key}}"