Keep the quest-log meta line's class when a quest is not late

The open quest card built its meta line as
class="meta ${meta.late ? "late" : nothing}"; Lit drops the whole
attribute when any interpolated part is nothing, so every on-time quest
lost the meta class and its styling. Choose the full class string
instead, rebuild the panel bundle, and add a rendered regression test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/cards/quest-log.ts

@@ -2096,7 +2096,7 @@ export class NestQuestQuestLogCard extends LitElement {
         <span class="tile" aria-hidden="true">${ICON_STAR}</span>
         <div class="body">
           <span class="quest-title">${instance.title}</span>
-          <span class="meta ${meta.late ? "late" : nothing}">${meta.text}</span>
+          <span class="${meta.late ? "meta late" : "meta"}">${meta.text}</span>
         </div>
         <button
           class="complete"