Contact email: follow-up given with a report is kept and removable; match by rev

- Ticking follow-up questions on a report makes that address the contact
  email (follow-up ticked, update choice unchanged), so Settings shows it
  and Remove my email withdraws it like any other.
- Reports carry contact_rev; the inbox takes a report's follow-up
  permission back when a later change from that copy (higher rev) no
  longer agrees, whatever the clocks say.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

ui/index.html

@@ -1262,7 +1262,7 @@
     <label class="field">What happened?<textarea id="bugText" maxlength="5000" required minlength="10"
       placeholder="What you did, what happened, and what you expected."></textarea></label>
     <label class="popt"><input type="checkbox" id="bugFollowup"><b>The maintainer may contact me with follow-up questions</b>
-      <span class="sub">Optional. Your email address goes with this report only when this is ticked.</span></label>
+      <span class="sub">Optional. Your email address goes with this report only when this is ticked, and is kept as your contact email in Privacy &amp; updates, where you can remove it.</span></label>
     <label class="field">Your email address<input type="email" id="bugContact" maxlength="254" placeholder="you@example.com" disabled></label>
     <label class="popt"><input type="checkbox" id="bugDiag" checked><b>Include diagnostics</b>
       <span class="sub">Frame Control's version, your OS and the Frame's SteamOS build.</span></label>
@@ -4125,6 +4125,7 @@ $("bugForm").onsubmit = async e => {
     $("bugMsg").textContent = `Couldn't send it: ${err.message}. Try again later, or use Copy report.`;
     $("bugSend").disabled = false;
   }
+  if ($("bugFollowup").checked) api("/api/contact").then(renderContact).catch(() => {});
 };
 if (window.frameApp && window.frameApp.onReportProblem) window.frameApp.onReportProblem(openBugReport);