feat: reassign delegated filings from mobile Filed (Closes #895)

frontend/dashboard.css

@@ -539,6 +539,7 @@ textarea { resize: vertical; min-height: 120px; }
 #issue-sheet.read-only .detail-defer,
 #issue-sheet.read-only #issue-blockers,
 #issue-sheet.read-only #retry-issue-comment-actions { display:none; }
+#issue-sheet.read-only.filed-reassignable #issue-handoff { display:block; }
 .filed-claim-actions { position:sticky; bottom:0; z-index:4; box-sizing:border-box; width:min(560px,100%); display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:8px; margin-top:14px; padding:10px 4px calc(10px + env(safe-area-inset-bottom)); background:rgba(11,21,38,.98); border-top:1px solid #4ade80; }
 .filed-claim-actions[hidden] { display:none; }
 .filed-claim-actions button { min-width:0; min-height:44px; }

frontend/dashboard.js

@@ -3383,7 +3383,10 @@
     if (!item) return;
     const readOnly = issueController.readOnly(item);
     const withdrawable = item.is_filed && !item.is_assigned && !item.is_completed && item.state === 'open';
+    const reassignable = item.is_filed && !item.is_completed && item.state === 'open' &&
+      Array.isArray(item.assignees) && item.assignees.length > 0;
     qs('#issue-sheet').classList.toggle('read-only', readOnly);
+    qs('#issue-sheet').classList.toggle('filed-reassignable', reassignable);
     issueDetailPosition.open(workDetailIdentity('issue', item));
     qs('#issue-planning').inert = false;
     qs('#issue-handoff').inert = false;
@@ -3417,12 +3420,15 @@
     qs('#issue-comment-title').textContent = readOnly ? 'Add follow-up' : 'Add comment';
     qs('#issue-comment-status').textContent = '';
     qs('#issue-handoff').open = false;
+    qs('#issue-handoff-summary').textContent = reassignable ? 'Change delegate' : 'Hand off to teammate';
     qs('#issue-handoff-recipient').innerHTML = '<option value="">Select a teammate</option>';
     qs('#issue-handoff-recipient').disabled = true;
     qs('#confirm-issue-handoff').disabled = true;
-    qs('#confirm-issue-handoff').textContent = workSession.checkpointed(item) ? 'Hand off & next' : 'Confirm handoff';
+    qs('#confirm-issue-handoff').textContent = reassignable ? 'Confirm change' :
+      (workSession.checkpointed(item) ? 'Hand off & next' : 'Confirm handoff');
     qs('#load-issue-handoff').disabled = false;
-    qs('#issue-handoff-status').textContent = 'Load teammates to transfer ownership.';
+    qs('#issue-handoff-status').textContent = reassignable ?
+      'Load teammates to change the current delegate.' : 'Load teammates to transfer ownership.';
     qs('#issue-planning').open = false;
     qs('#retry-issue-planning').hidden = true;
     qs('#issue-label-list').textContent = '';
@@ -5939,22 +5945,24 @@
     qs('#issue-handoff-status').textContent = 'Loading eligible teammates…';
     try {
       const candidates = await issueController.loadHandoffCandidates(selectedIssue);
+      const currentAssignees = new Set(selectedIssue.is_filed ? (selectedIssue.assignees || []) : []);
+      const availableCandidates = candidates.filter(candidate => !currentAssignees.has(candidate.login));
       select.textContent = '';
       const placeholder = document.createElement('option');
       placeholder.value = '';
-      placeholder.textContent = candidates.length ? 'Select a teammate' : 'No eligible teammates';
+      placeholder.textContent = availableCandidates.length ? 'Select a teammate' : 'No eligible teammates';
       select.appendChild(placeholder);
-      candidates.forEach(candidate => {
+      availableCandidates.forEach(candidate => {
         const option = document.createElement('option');
         option.value = candidate.login;
         option.textContent = candidate.name + (candidate.name === candidate.login ? '' : ' (@' + candidate.login + ')');
         select.appendChild(option);
       });
-      select.disabled = !candidates.length;
+      select.disabled = !availableCandidates.length;
       qs('#confirm-issue-handoff').disabled = true;
-      qs('#issue-handoff-status').textContent = candidates.length ?
+      qs('#issue-handoff-status').textContent = availableCandidates.length ?
         'Choose who should own this issue next.' : 'No other eligible assignees were found.';
-      if (candidates.length) select.focus();
+      if (availableCandidates.length) select.focus();
     } catch (error) {
       qs('#issue-handoff-status').textContent = error.message + ' Retry loading teammates.';
       button.disabled = false;
@@ -5966,13 +5974,31 @@
   });
   qs('#confirm-issue-handoff').addEventListener('click', async () => {
     const recipient = qs('#issue-handoff-recipient').value;
-    if (!selectedIssue || !recipient || !window.confirm('Hand off ' + selectedIssue.key + ' to @' + recipient + '?')) return;
+    if (!selectedIssue || !recipient) return;
+    const changingDelegate = selectedIssue.is_filed && !selectedIssue.is_completed &&
+      Array.isArray(selectedIssue.assignees) && selectedIssue.assignees.length > 0;
+    const previousDelegates = changingDelegate ? selectedIssue.assignees.join(', @') : '';
+    const confirmation = changingDelegate ?
+      'Change delegate from @' + previousDelegates + ' to @' + recipient + ' for ' + selectedIssue.key + '?' :
+      'Hand off ' + selectedIssue.key + ' to @' + recipient + '?';
+    if (!window.confirm(confirmation)) return;
     const handingOff = selectedIssue;
     const continuingSession = workSession.checkpointed(handingOff);
     const button = qs('#confirm-issue-handoff');
     button.disabled = true;
     qs('#issue-handoff-status').textContent = 'Confirming handoff…';
     try {
+      if (changingDelegate) {
+        const confirmed = await issueController.reassign(selectedIssue, recipient);
+        Object.assign(handingOff, { assignees:confirmed.assignees, updated_at:confirmed.updated_at || handingOff.updated_at });
+        selectedIssue = handingOff;
+        if (selectedIssueDetail) selectedIssueDetail.assignees = confirmed.assignees;
+        qs('#issue-assignees').textContent = 'Assigned to ' + recipient;
+        qs('#issue-handoff').open = false;
+        qs('#issue-handoff-status').textContent = 'Delegate changed to @' + recipient + '.';
+        refreshMyWorkView({ reconcileSession:false });
+        return;
+      }
       await issueController.handoff(selectedIssue, recipient, lastContextSnapshot?.user?.login);
       lastContextSnapshot = buildMyWork.removeIssue(
         lastContextSnapshot, handingOff.repository, handingOff.number

frontend/index.html

@@ -689,7 +689,7 @@
       </fieldset>
     </details>
     <details class="issue-handoff" id="issue-handoff">
-      <summary>Hand off to teammate</summary>
+      <summary id="issue-handoff-summary">Hand off to teammate</summary>
       <div>
         <button id="load-issue-handoff" type="button">Choose teammate</button>
         <label for="issue-handoff-recipient" class="small">Eligible repository assignee</label>

frontend/issue-sheet.js

@@ -23,6 +23,7 @@ function createIssueSheet({ fetchJson, storage, createConversationPager = global
   let closeRequest = null;
   let releaseRequest = null;
   let handoffRequest = null;
+  let reassignRequest = null;
   let labelRequest = null;
   let editRequest = null;
   let dueDateRequest = null;
@@ -70,7 +71,8 @@ function createIssueSheet({ fetchJson, storage, createConversationPager = global
       });
     },
     loadHandoffCandidates(item) {
-      return fetchJson(issuePath(item) + '/handoff-candidates', {
+      const access = item?.is_filed ? '?access=filed' : '';
+      return fetchJson(issuePath(item) + '/handoff-candidates' + access, {
         headers: { Accept: 'application/json' },
       });
     },
@@ -262,6 +264,28 @@ function createIssueSheet({ fetchJson, storage, createConversationPager = global
       }).finally(() => { handoffRequest = null; });
       return handoffRequest;
     },
+    reassign(item, recipient) {
+      if (reassignRequest) return reassignRequest;
+      const expectedAssignees = Array.isArray(item?.assignees) ? item.assignees.slice() : [];
+      reassignRequest = fetchJson(issuePath(item) + '/reassign', {
+        method: 'PATCH',
+        headers: { Accept: 'application/json', 'Content-Type': 'application/json' },
+        body: JSON.stringify({ recipient, expected_assignees: expectedAssignees }),
+      }).then(result => {
+        if (
+          result?.number !== item.number ||
+          result?.recipient !== recipient ||
+          !Array.isArray(result.assignees) ||
+          result.assignees.length !== 1 ||
+          result.assignees[0] !== recipient ||
+          JSON.stringify(result.previous_assignees) !== JSON.stringify(expectedAssignees)
+        ) {
+          throw new Error('Issue reassignment was not confirmed.');
+        }
+        return result;
+      }).finally(() => { reassignRequest = null; });
+      return reassignRequest;
+    },
     comment(item, body) {
       if (commentRequest) return commentRequest;
       this.saveDraft(item, body);