feat(git stash): add stash listing and push/apply/pop/drop UI

This change introduces Git stash support end-to-end, including a new
backend command to list stashes and operations to push, apply, pop, and
drop them. The frontend now fetches stashes as part of the repository
bundle and provides a dedicated panel to manage shelved changes.

- Add GitStash model and Tauri commands for stash operations
- Implement StashPanel component and wire it into the app
- Adjust sidebar layout and add stash-specific styling

src-tauri/src/git.rs

@@ -56,6 +56,16 @@ pub struct GitBranch {
     pub remote: bool,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+pub struct GitStash {
+    pub selector: String,
+    pub index: u32,
+    pub hash: String,
+    pub branch: Option<String>,
+    pub message: String,
+    pub date: String,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize)]
 pub struct GitCommit {
     pub hash: String,
@@ -234,6 +244,7 @@ pub fn open_repository_file(path: String, file: String) -> Result<(), String> {
 pub struct RepositoryBundle {
     pub status: GitStatus,
     pub branches: Vec<GitBranch>,
+    pub stashes: Vec<GitStash>,
     pub commits: Vec<GitCommit>,
     pub files: Vec<GitRepositoryFile>,
 }
@@ -252,11 +263,13 @@ pub async fn open_repository_bundle(
         let repo = resolve_repo(&path)?;
         let status = status_for_repo(&repo)?;
         let branches = branches_for_repo(&repo)?;
+        let stashes = stashes_for_repo(&repo)?;
         let commits = commits_for_repo(&repo, commit_limit)?;
         let files = repository_files_with_status(&repo, &status)?;
         Ok(RepositoryBundle {
             status,
             branches,
+            stashes,
             commits,
             files,
         })
@@ -277,6 +290,12 @@ pub fn list_branches(path: String) -> Result<Vec<GitBranch>, String> {
     branches_for_repo(&repo)
 }
 
+#[tauri::command]
+pub fn list_stashes(path: String) -> Result<Vec<GitStash>, String> {
+    let repo = resolve_repo(&path)?;
+    stashes_for_repo(&repo)
+}
+
 fn branches_for_repo(repo: &Path) -> Result<Vec<GitBranch>, String> {
     let output = run_git(
         repo,
@@ -316,6 +335,129 @@ fn branches_for_repo(repo: &Path) -> Result<Vec<GitBranch>, String> {
     Ok(branches)
 }
 
+fn stashes_for_repo(repo: &Path) -> Result<Vec<GitStash>, String> {
+    let output = run_git(repo, ["stash", "list", "--format=%gd%x00%H%x00%cr%x00%gs"])?;
+    let text = String::from_utf8_lossy(&output);
+    let mut stashes = Vec::new();
+
+    for line in text.lines() {
+        let mut parts = line.splitn(4, '\0');
+        let selector = parts.next().unwrap_or_default().trim();
+        let hash = parts.next().unwrap_or_default().trim();
+        let date = parts.next().unwrap_or_default().trim();
+        let subject = parts.next().unwrap_or_default().trim();
+        if selector.is_empty() {
+            continue;
+        }
+
+        let index = stash_index_from_selector(selector).unwrap_or(stashes.len() as u32);
+        let (branch, message) = parse_stash_subject(subject);
+        stashes.push(GitStash {
+            selector: selector.to_string(),
+            index,
+            hash: hash.to_string(),
+            branch,
+            message,
+            date: date.to_string(),
+        });
+    }
+
+    Ok(stashes)
+}
+
+fn stash_index_from_selector(selector: &str) -> Option<u32> {
+    selector
+        .strip_prefix("stash@{")
+        .and_then(|value| value.strip_suffix('}'))
+        .and_then(|value| value.parse::<u32>().ok())
+}
+
+fn parse_stash_subject(subject: &str) -> (Option<String>, String) {
+    for prefix in ["WIP on ", "On "] {
+        if let Some(value) = subject.strip_prefix(prefix) {
+            if let Some((branch, rest)) = value.split_once(": ") {
+                let message = if prefix == "WIP on " {
+                    rest.split_once(' ').map(|(_, msg)| msg).unwrap_or(rest)
+                } else {
+                    rest
+                };
+                return (Some(branch.to_string()), message.to_string());
+            }
+        }
+    }
+
+    (None, subject.to_string())
+}
+
+#[tauri::command]
+pub fn stash_push(
+    path: String,
+    message: Option<String>,
+    include_untracked: bool,
+) -> Result<GitStatus, String> {
+    let repo = resolve_repo(&path)?;
+    let trimmed_message = message.unwrap_or_default().trim().to_string();
+    let mut args: Vec<OsString> = vec![OsString::from("stash"), OsString::from("push")];
+    if include_untracked {
+        args.push(OsString::from("--include-untracked"));
+    }
+    if !trimmed_message.is_empty() {
+        args.push(OsString::from("-m"));
+        args.push(OsString::from(trimmed_message));
+    }
+
+    run_git(&repo, args)?;
+    status_for_repo(&repo)
+}
+
+#[tauri::command]
+pub fn stash_apply(path: String, selector: String) -> Result<GitStatus, String> {
+    run_stash_update(path, "apply", selector)
+}
+
+#[tauri::command]
+pub fn stash_pop(path: String, selector: String) -> Result<GitStatus, String> {
+    run_stash_update(path, "pop", selector)
+}
+
+#[tauri::command]
+pub fn stash_drop(path: String, selector: String) -> Result<GitStatus, String> {
+    run_stash_update(path, "drop", selector)
+}
+
+fn run_stash_update(path: String, action: &str, selector: String) -> Result<GitStatus, String> {
+    let repo = resolve_repo(&path)?;
+    let selector = validate_stash_selector(&selector)?;
+    let output = git_command()
+        .arg("-C")
+        .arg(&repo)
+        .args(["stash", action, selector.as_str()])
+        .output()
+        .map_err(|err| format!("Could not start Git. Is Git installed? {err}"))?;
+
+    if output.status.success() {
+        return status_for_repo(&repo);
+    }
+
+    let status = status_for_repo(&repo)?;
+    if has_unresolved_conflicts(&status) {
+        return Ok(status);
+    }
+
+    Err(format!(
+        "Git command failed: {}",
+        command_output_details(&output)
+    ))
+}
+
+fn validate_stash_selector(selector: &str) -> Result<String, String> {
+    let selector = selector.trim();
+    let Some(index) = stash_index_from_selector(selector) else {
+        return Err("Invalid stash selector.".to_string());
+    };
+    Ok(format!("stash@{{{index}}}"))
+}
+
 #[tauri::command]
 pub fn checkout_branch(path: String, branch: String) -> Result<GitStatus, String> {
     let repo = resolve_repo(&path)?;