feat: render safe mobile Markdown across My Work (#343)

frontend/index.html

@@ -184,7 +184,7 @@
     </div>
     <div id="search-preview-status" class="small" aria-live="polite">Choose a search result.</div>
     <div id="search-preview-meta" class="row"></div>
-    <p id="search-preview-body" class="search-preview-body"></p>
+    <div id="search-preview-body" class="search-preview-body markdown-content"></div>
     <div class="search-preview-actions">
       <button id="claim-search-result" type="button" hidden>Assign to me</button>
       <a id="open-search-result-gitea" href="#" target="_blank" rel="noopener noreferrer">Open in Gitea</a>
@@ -221,7 +221,7 @@
     <div id="issue-sheet-status" class="small" aria-live="polite">Choose an issue.</div>
     <button class="issue-retry" id="retry-issue-load" type="button" hidden>Reload latest issue</button>
     <div class="row"><span id="issue-labels"></span><span class="small" id="issue-assignees"></span></div>
-    <p class="issue-sheet-content" id="issue-sheet-body"></p>
+    <div class="issue-sheet-content markdown-content" id="issue-sheet-body"></div>
     <h2>Full conversation</h2>
     <div id="issue-comments"></div>
     <button class="conversation-more" id="load-older-issue-comments" type="button" hidden>Load older messages</button>
@@ -380,7 +380,7 @@
     <div id="update-conversation-status" class="small" aria-live="assertive"></div>
     <details>
       <summary><h2>Subject context</h2></summary>
-      <p class="update-sheet-content muted" id="update-subject-body"></p>
+      <div class="update-sheet-content muted markdown-content" id="update-subject-body"></div>
     </details>
     <section class="update-reply" aria-labelledby="update-reply-title">
       <h2 id="update-reply-title">Reply</h2>
@@ -412,7 +412,7 @@
     </div>
     <div id="pull-sheet-status" class="small" aria-live="polite">Choose a pull request.</div>
     <button class="pull-retry" id="retry-pull-load" type="button" hidden>Retry loading pull request</button>
-    <p class="pull-sheet-content" id="pull-sheet-body"></p>
+    <div class="pull-sheet-content markdown-content" id="pull-sheet-body"></div>
     <h2>Full conversation</h2><div id="pull-comments"></div>
     <button class="conversation-more" id="load-older-pull-comments" type="button" hidden>Load older messages</button>
     <div id="pull-conversation-status" class="small" aria-live="assertive"></div>
@@ -455,7 +455,7 @@
     </div>
     <div id="review-sheet-status" class="small" aria-live="polite">Choose a review request.</div>
     <button class="review-retry" id="retry-review-load" hidden>Retry loading review</button>
-    <p class="review-sheet-body" id="review-sheet-body"></p>
+    <div class="review-sheet-body markdown-content" id="review-sheet-body"></div>
     <div class="row"><span class="pill" id="review-ci-state">CI unknown</span><button class="share-work-route" type="button">Share</button><a id="open-review-gitea" href="#" target="_blank" rel="noopener noreferrer">Open in Gitea</a></div>
     <h2>Changed files</h2>
     <div id="review-files" class="muted"></div>