git: Add git stash picker (#35927)

Closes #ISSUE

This PR continues work from #32821 by adding a stash entry picker for
pop/drop operations. Additionally, the stash pop action in the git panel
is now disabled when no stash entries exist, preventing error logs from
attempted pops on empty stashes.

Preview:

<img width="1920" height="1256" alt="Screenshot From 2025-09-11
14-08-31"
src="https://github.com/user-attachments/assets/b2f32974-8c69-4e50-8951-24ab2cf93c12"
/>

<img width="1920" height="1256" alt="Screenshot From 2025-09-11
14-08-12"
src="https://github.com/user-attachments/assets/992ce237-43c9-456e-979c-c2e2149d633e"
/>



Release Notes:

- Added a stash picker to pop and drop a specific stash entry
- Disabled the stash pop action on the git panel when no stash entries
exist
- Added git stash apply command
- Added git stash drop command

crates/git_ui/src/git_ui.rs

@@ -36,6 +36,7 @@ pub mod picker_prompt;
 pub mod project_diff;
 pub(crate) mod remote_output;
 pub mod repository_selector;
+pub mod stash_picker;
 pub mod text_diff_view;
 
 actions!(
@@ -62,6 +63,7 @@ pub fn init(cx: &mut App) {
         git_panel::register(workspace);
         repository_selector::register(workspace);
         branch_picker::register(workspace);
+        stash_picker::register(workspace);
 
         let project = workspace.project().read(cx);
         if project.is_read_only(cx) {
@@ -133,6 +135,14 @@ pub fn init(cx: &mut App) {
                 panel.stash_pop(action, window, cx);
             });
         });
+        workspace.register_action(|workspace, action: &git::StashApply, window, cx| {
+            let Some(panel) = workspace.panel::<git_panel::GitPanel>(cx) else {
+                return;
+            };
+            panel.update(cx, |panel, cx| {
+                panel.stash_apply(action, window, cx);
+            });
+        });
         workspace.register_action(|workspace, action: &git::StageAll, window, cx| {
             let Some(panel) = workspace.panel::<git_panel::GitPanel>(cx) else {
                 return;