feat: choose initial owner during issue filing

frontend/index.html

@@ -797,6 +797,12 @@
       </div>
       <button class="create-issue-repository-more" id="load-more-issue-repositories" type="button" hidden>Load more repositories</button>
       <div id="create-issue-repository-status" class="small" aria-live="polite"></div>
+      <label class="create-issue-owner" for="create-issue-assignee">Owner
+        <select id="create-issue-assignee" aria-describedby="create-issue-assignee-status">
+          <option value="">Me</option>
+        </select>
+        <span id="create-issue-assignee-status" class="small" aria-live="polite">Open the owner picker to load eligible teammates.</span>
+      </label>
       <label for="create-issue-milestone">Milestone <span class="small">Optional</span>
         <select id="create-issue-milestone" aria-describedby="create-issue-milestone-status">
           <option value="">No milestone</option>