feat: update authored pull branches from mobile (Closes #1360)

frontend/dashboard.css

@@ -800,6 +800,9 @@ textarea { resize: vertical; min-height: 120px; }
 .ci-check-log { max-width:100%; max-height:42vh; margin:8px 0; padding:10px; overflow-x:auto; overflow-y:auto; border:1px solid #2a496e; border-radius:6px; background:#07101d; color:#dbeafe; font-size:.78rem; white-space:pre; }
 .ci-check-recovery-actions { position:sticky; bottom:0; display:grid; grid-template-columns:1fr 1fr; gap:8px; padding-top:6px; background:#101b2e; }
 .ci-check-recovery-actions button { min-height:44px; }
+.pull-branch-update { max-width:100%; min-width:0; margin:10px 0; padding:12px; border:1px solid #60a5fa; border-radius:10px; overflow-wrap:anywhere; }
+.pull-branch-update h3 { margin:0 0 6px; }
+.pull-branch-update button { width:100%; min-height:44px; }
 .update-sheet { position:fixed; inset:0; z-index:55; display:none; justify-content:flex-end; background:rgba(5,12,21,.72); backdrop-filter:blur(4px); }
 .update-sheet.open { display:flex; }
 .update-sheet-panel { width:min(560px,100%); height:100%; overflow:auto; padding:18px; background:#0b1526; border-left:1px solid #2a496e; }

frontend/index.html

@@ -1722,6 +1722,11 @@
       <div id="pull-review-status" class="small" aria-live="polite">Expand to load changed files and merge readiness.</div>
       <button class="pull-retry" id="pull-review-retry" type="button" hidden>Retry review data</button>
       <div class="row"><span class="pill" id="pull-ci-state">CI unknown</span><span class="pill" id="pull-merge-state">Review data not loaded</span></div>
+      <section class="pull-branch-update" id="pull-branch-update" aria-labelledby="pull-branch-update-heading" hidden>
+        <h3 id="pull-branch-update-heading">Bring branch up to date</h3>
+        <p class="small" id="pull-branch-update-status" role="status" aria-live="assertive"></p>
+        <button id="update-pull-branch" type="button">Update branch</button>
+      </section>
       <section class="pull-reviewer-summary" aria-labelledby="pull-reviewer-heading">
         <h3 id="pull-reviewer-heading">Reviewer status</h3>
         <div id="pull-reviewer-status" class="small" aria-live="polite">Reviewer status not loaded.</div>

frontend/pull-sheet.js

@@ -231,6 +231,46 @@ function resetReviewRequestControls(doc, detail) {
   qs('#pull-feedback-status').textContent = '';
 }
 
+function resetBranchUpdateControls(doc, detail) {
+  const panel = doc.querySelector('#pull-branch-update');
+  if (!panel) return;
+  const eligible = detail?.capabilities?.authored === true && detail?.state === 'open' &&
+    detail?.draft !== true && detail?.merged !== true && detail?.mergeable === false && detail?.head_sha;
+  panel.hidden = !eligible;
+  doc.querySelector('#update-pull-branch').disabled = false;
+  doc.querySelector('#pull-branch-update-status').textContent = eligible ?
+    'Merge the latest base branch into this pull request. Reviews and checks may run again.' : '';
+}
+
+function bindBranchUpdateControls(doc, controller, getSelected, getDetail) {
+  const button = doc.querySelector('#update-pull-branch');
+  if (!button || button.dataset.bound === 'true') return;
+  button.dataset.bound = 'true';
+  button.addEventListener('click', async () => {
+    const item = getSelected?.();
+    const detail = getDetail?.();
+    if (!item || !detail?.head_sha || detail?.capabilities?.authored !== true ||
+        !globalThis.confirm('Update ' + item.key + ' with the latest base branch? Reviews and checks may run again.')) return;
+    button.disabled = true;
+    const status = doc.querySelector('#pull-branch-update-status');
+    status.textContent = 'Updating branch…';
+    try {
+      const result = await controller.updateBranch(item, detail.head_sha);
+      if (getSelected?.() !== item || getDetail?.() !== detail) return;
+      Object.assign(detail, result, { mergeable:null, ci_state:'pending', reviewers:[] });
+      status.textContent = 'Branch updated. Refreshing checks and review state…';
+      doc.querySelector('#pull-review-retry')?.click();
+      status.textContent = 'Branch updated to ' + result.head_sha.slice(0, 8) + '. Review the refreshed checks before merging.';
+      button.hidden = true;
+      doc.querySelector('#refresh-pull-checks')?.focus();
+    } catch (error) {
+      status.textContent = error.message + ' Reload the latest pull request state before retrying.';
+      button.disabled = false;
+      button.focus();
+    }
+  });
+}
+
 function bindReviewRequestControls(doc, controller, getSelected, getDetail, getLogin) {
   const qs = selector => doc.querySelector(selector);
   const load = qs('#load-pull-reviewers');
@@ -238,6 +278,7 @@ function bindReviewRequestControls(doc, controller, getSelected, getDetail, getL
   load.dataset.reviewRequestBound = 'true';
   controller.setReviewDetail = detail => {
     resetReviewRequestControls(doc, detail);
+    resetBranchUpdateControls(doc, detail);
     applyOwnershipCapabilities(doc, detail?.capabilities);
     resetLifecycleControls(doc, detail?.saved_at ? null : detail);
     controller.edit?.setDetail(detail, Boolean(detail?.saved_at));
@@ -577,6 +618,7 @@ function bindContextEditor(doc, controller, getSelected, getDetail, getLogin) {
 
 function bindOwnershipControls(doc, controller, getSelected, finish, getDetail, getLogin) {
   bindReviewRequestControls(doc, controller, getSelected, getDetail, getLogin);
+  bindBranchUpdateControls(doc, controller, getSelected, getDetail);
   bindFeedbackControls(doc, controller, getSelected, getDetail, getLogin);
   bindCheckRecovery(doc, controller, getSelected, getDetail);
   bindLifecycleControls(doc, controller, getSelected, getDetail, result => controller.onState?.(result));
@@ -650,6 +692,7 @@ function createPullSheet({ fetchJson, storage, onState, createConversationPager
   let mergeRequest = null;
   let checkRequest = null;
   let ownershipRequest = null;
+  let branchUpdateRequest = null;
   let candidateRequest = null;
   let reviewCandidateRequest = null;
   let reviewRequestMutation = null;
@@ -975,6 +1018,20 @@ function createPullSheet({ fetchJson, storage, onState, createConversationPager
       }).finally(() => { mergeRequest = null; });
       return mergeRequest;
     },
+    updateBranch(item, expectedHeadSha) {
+      if (branchUpdateRequest) return branchUpdateRequest;
+      branchUpdateRequest = fetchJson(pathFor(item) + '/update-branch', {
+        method: 'POST',
+        headers: { Accept: 'application/json', 'Content-Type': 'application/json' },
+        body: JSON.stringify({ expected_head_sha: expectedHeadSha }),
+      }).then(result => {
+        if (!result?.head_sha || result.head_sha === expectedHeadSha) {
+          throw new Error('Branch update was not confirmed.');
+        }
+        return result;
+      }).finally(() => { branchUpdateRequest = null; });
+      return branchUpdateRequest;
+    },
   };
 }