feat: watch assigned work from mobile detail (Closes #1309)

frontend/index.html

@@ -1181,11 +1181,13 @@
     </section>
     <div class="issue-sheet-actions">
       <button class="share-work-route" type="button">Share</button>
+      <button id="watch-issue-detail" type="button">Watch issue</button>
       <button id="release-issue" type="button">Release assignment</button>
       <button id="close-issue" type="button">Close issue</button>
       <a id="open-issue-gitea" href="#" target="_blank" rel="noopener noreferrer">Open in Gitea</a>
       <details class="detail-defer"><summary>Defer</summary><div class="detail-defer-options"><button type="button" data-detail-defer-preset="today" disabled data-planning-disabled>Later today</button><button type="button" data-detail-defer-preset="tomorrow" disabled data-planning-disabled>Tomorrow</button><button type="button" data-detail-defer-custom disabled data-planning-disabled>Choose date &amp; time</button><button type="button" data-detail-defer-cancel>Cancel</button></div></details>
     </div>
+    <div id="issue-watch-status" class="detail-watch-status small" aria-live="polite"></div>
     <nav class="work-session-nav" aria-label="Work session" hidden>
       <span class="small" aria-live="polite" data-work-session-progress></span>
       <button type="button" data-work-session-previous>Previous</button>
@@ -1719,10 +1721,12 @@
     </details>
     <div class="pull-sheet-actions">
       <button class="share-work-route" type="button">Share</button>
+      <button id="watch-pull-detail" type="button">Watch pull request</button>
       <button id="release-pull" type="button">Release assignment</button>
       <a id="open-pull-gitea" href="#" target="_blank" rel="noopener noreferrer">Open in Gitea</a>
       <details class="detail-defer"><summary>Defer</summary><div class="detail-defer-options"><button type="button" data-detail-defer-preset="today" disabled data-planning-disabled>Later today</button><button type="button" data-detail-defer-preset="tomorrow" disabled data-planning-disabled>Tomorrow</button><button type="button" data-detail-defer-custom disabled data-planning-disabled>Choose date &amp; time</button><button type="button" data-detail-defer-cancel>Cancel</button></div></details>
     </div>
+    <div id="pull-watch-status" class="detail-watch-status small" aria-live="polite"></div>
     <nav class="work-session-nav" aria-label="Work session" hidden>
       <span class="small" aria-live="polite" data-work-session-progress></span>
       <button type="button" data-work-session-previous>Previous</button>