feat(ui): add desktop git sidebar + terminal dock and improve in-app PR workflow (#362)

* feat: add unified dropdown with services content in header

* feat: add right Git sidebar with resizable panel

* feat: implement responsive panel auto-toggle and terminal rehydration

- Auto-close the right sidebar when width is below a threshold and auto-open it when space permits
- Auto-close the bottom terminal when height is below a threshold and auto-open it when enough space
- Apply a dedicated rehydrated streaming configuration for terminal sessions to optimize reconnect behavior

* feat: enhance PR view with status caching and annotations

* feat(ui): enable chat dispatch in PullRequestSection

* feat(TerminalView): adjust layout

* feat: refine chat input layout and text selection menu

* fix(ui): show empty state in GitView when no changes

* feat(git): update PR actions styling and create PR button

packages/web/src/api/github.ts

@@ -12,6 +12,7 @@ import type {
   GitHubPullRequestMergeResult,
   GitHubPullRequestReadyInput,
   GitHubPullRequestReadyResult,
+  GitHubPullRequestUpdateInput,
   GitHubPullRequestStatus,
   GitHubDeviceFlowComplete,
   GitHubDeviceFlowStart,
@@ -114,6 +115,19 @@ export const createWebGitHubAPI = (): GitHubAPI => ({
     return body;
   },
 
+  async prUpdate(payload: GitHubPullRequestUpdateInput): Promise<GitHubPullRequest> {
+    const response = await fetch('/api/github/pr/update', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
+      body: JSON.stringify(payload),
+    });
+    const body = await jsonOrNull<GitHubPullRequest & { error?: string }>(response);
+    if (!response.ok || !body) {
+      throw new Error((body as { error?: string } | null)?.error || response.statusText || 'Failed to update PR');
+    }
+    return body;
+  },
+
   async prMerge(payload: GitHubPullRequestMergeInput): Promise<GitHubPullRequestMergeResult> {
     const response = await fetch('/api/github/pr/merge', {
       method: 'POST',