feat: add git stash management

Add a Stashes dialog with create, apply, pop, and drop actions
Include untracked files automatically when stashing
Show file counts for current changes and stash entries

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

@@ -209,6 +209,13 @@ export interface GitPullOptions {
   rebase?: boolean;
 }
 
+export interface GitStashEntry {
+  ref: string;
+  message: string;
+  relativeTime: string;
+  hash: string;
+}
+
 export interface GitRemote {
   name: string;
   fetchUrl: string;
@@ -429,6 +436,12 @@ export interface GitAPI {
   gitPush(directory: string, options?: { remote?: string; branch?: string; options?: string[] | Record<string, unknown> }): Promise<GitPushResult>;
   gitPull(directory: string, options?: GitPullOptions): Promise<GitPullResult>;
   gitFetch(directory: string, options?: { remote?: string; branch?: string }): Promise<{ success: boolean }>;
+  listGitStashes(directory: string): Promise<{ stashes: GitStashEntry[] }>;
+  countGitStashFiles(directory: string, refs: string[]): Promise<{ counts: Record<string, number> }>;
+  stashGitChanges(directory: string, options?: { message?: string }): Promise<{ success: boolean; created: boolean; message: string; output: string }>;
+  applyGitStash(directory: string, options: { ref: string }): Promise<{ success: boolean; ref: string }>;
+  popGitStash(directory: string, options: { ref: string }): Promise<{ success: boolean; ref: string }>;
+  dropGitStash(directory: string, options: { ref: string }): Promise<{ success: boolean; ref: string }>;
   checkoutBranch(directory: string, branch: string): Promise<{ success: boolean; branch: string }>;
   createBranch(directory: string, name: string, startPoint?: string): Promise<{ success: boolean; branch: string }>;
   renameBranch(directory: string, oldName: string, newName: string): Promise<{ success: boolean; branch: string }>;