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/ui/src/lib/api/types.ts

@@ -594,13 +594,30 @@ export type GitHubCheckRun = {
     url?: string;
     name?: string;
     conclusion?: string | null;
-    steps?: Array<{ name: string; status?: string; conclusion?: string | null; number?: number }>;
+    steps?: Array<{
+      name: string;
+      status?: string;
+      conclusion?: string | null;
+      number?: number;
+      startedAt?: string;
+      completedAt?: string;
+    }>;
   };
+  annotations?: Array<{
+    path?: string;
+    startLine?: number;
+    endLine?: number;
+    level?: string;
+    message: string;
+    title?: string;
+    rawDetails?: string;
+  }>;
 };
 
 export type GitHubPullRequest = {
   number: number;
   title: string;
+  body?: string;
   url: string;
   state: 'open' | 'closed' | 'merged';
   draft: boolean;
@@ -686,6 +703,13 @@ export type GitHubPullRequestCreateInput = {
   draft?: boolean;
 };
 
+export type GitHubPullRequestUpdateInput = {
+  directory: string;
+  number: number;
+  title: string;
+  body?: string;
+};
+
 export type GitHubPullRequestMergeInput = {
   directory: string;
   number: number;
@@ -794,6 +818,7 @@ export interface GitHubAPI {
 
   prStatus(directory: string, branch: string): Promise<GitHubPullRequestStatus>;
   prCreate(payload: GitHubPullRequestCreateInput): Promise<GitHubPullRequest>;
+  prUpdate(payload: GitHubPullRequestUpdateInput): Promise<GitHubPullRequest>;
   prMerge(payload: GitHubPullRequestMergeInput): Promise<GitHubPullRequestMergeResult>;
   prReady(payload: GitHubPullRequestReadyInput): Promise<GitHubPullRequestReadyResult>;