feat: capture cold-offline work for filing (#301)

frontend/index.html

@@ -335,6 +335,7 @@
       </fieldset>
       <div class="small">The issue will be assigned to you.</div>
       <div class="create-issue-actions">
+        <button id="save-unfiled-issue" type="button">Save for filing</button>
         <button id="submit-new-issue" type="submit">Create &amp; assign to me</button>
         <div id="create-issue-status" class="small" aria-live="assertive"></div>
       </div>
@@ -506,6 +507,7 @@
 <script src="static/search-preview.js"></script>
 <script src="static/widgets.js"></script>
 <script src="static/drafts.js"></script>
+<script src="static/unfiled-captures.js"></script>
 <script src="static/outbox-coordinator.js"></script>
 <script src="static/background-issue-sync.js"></script>
 <script src="static/issue-outbox.js"></script>