feat(startup): wire startup repo path from CLI to UI

The app now supports opening a repository at startup by
reading a --repo argument and passing the path to the UI.
A new startup repository state is managed in the backend and
exposed via a tauri command and event, enabling the frontend
to auto-open the repository when ready. The UI adds a small
startup flow with retry handling to ensure the path is
consumed once available.
- Reads --repo or --repo=PATH and resolves relative paths
- Signals UI to open startup repo via open-startup-repository
- Frontend retries opening the repo until it succeeds

src-tauri/src/main.rs

@@ -31,9 +31,79 @@ use git::{
     stash_drop, stash_pop, stash_push, undo_last_commit, unlock_worktree, unstage_files,
     update_remote,
 };
-use tauri::Manager;
+use std::path::{Path, PathBuf};
+use std::sync::Mutex;
+use tauri::{Emitter, Manager};
 use telemetry::{emit_frontend_log, emit_frontend_span, set_telemetry_enabled};
 
+struct StartupRepository(Mutex<Option<String>>);
+
+fn repository_path_from_args(args: impl IntoIterator<Item = String>, cwd: &Path) -> Option<String> {
+    let mut args = args.into_iter();
+    let mut repository = None;
+
+    while let Some(arg) = args.next() {
+        if arg == "--repo" {
+            repository = args.next();
+            break;
+        }
+        if let Some(path) = arg.strip_prefix("--repo=") {
+            repository = Some(path.to_string());
+            break;
+        }
+        if !arg.starts_with('-') {
+            repository = Some(arg);
+            break;
+        }
+    }
+
+    repository.filter(|path| !path.trim().is_empty()).map(|path| {
+        let path = PathBuf::from(path);
+        if path.is_absolute() {
+            path
+        } else {
+            cwd.join(path)
+        }
+        .to_string_lossy()
+        .into_owned()
+    })
+}
+
+#[cfg(test)]
+mod startup_repository_tests {
+    use super::repository_path_from_args;
+    use std::path::Path;
+
+    #[test]
+    fn accepts_direct_relative_repository_path() {
+        let path = repository_path_from_args(["projects/repo".to_string()], Path::new("/home/user"));
+        assert_eq!(path.as_deref(), Some("/home/user/projects/repo"));
+    }
+
+    #[test]
+    fn accepts_repo_option() {
+        let path = repository_path_from_args(
+            ["--repo".to_string(), "/projects/repo".to_string()],
+            Path::new("/home/user"),
+        );
+        assert_eq!(path.as_deref(), Some("/projects/repo"));
+    }
+
+    #[test]
+    fn accepts_repo_equals_option() {
+        let path = repository_path_from_args(
+            ["--repo=projects/repo".to_string()],
+            Path::new("/home/user"),
+        );
+        assert_eq!(path.as_deref(), Some("/home/user/projects/repo"));
+    }
+}
+
+#[tauri::command]
+fn take_startup_repository(state: tauri::State<'_, StartupRepository>) -> Option<String> {
+    state.0.lock().ok()?.take()
+}
+
 struct ConsoleLogger;
 
 impl log::Log for ConsoleLogger {
@@ -96,8 +166,19 @@ async fn main() {
         return;
     }
 
+    let startup_repository = repository_path_from_args(
+        std::env::args().skip(1),
+        &std::env::current_dir().unwrap_or_default(),
+    );
+
     let builder = tauri::Builder::default()
-        .plugin(tauri_plugin_single_instance::init(|app, _, _| {
+        .plugin(tauri_plugin_single_instance::init(|app, args, cwd| {
+            if let Some(path) = repository_path_from_args(args.into_iter().skip(1), Path::new(&cwd)) {
+                if let Ok(mut pending) = app.state::<StartupRepository>().0.lock() {
+                    *pending = Some(path);
+                }
+                let _ = app.emit("open-startup-repository", ());
+            }
             #[cfg(desktop)]
             let _ = app
                 .get_webview_window("main")
@@ -112,6 +193,7 @@ async fn main() {
                 })
                 .build(),
         )
+        .manage(StartupRepository(Mutex::new(startup_repository)))
         .manage(SearchCancellationState::default())
         .manage(commit_ai::CommitAiEngine::new())
         .plugin(tauri_plugin_dialog::init());
@@ -226,7 +308,8 @@ async fn main() {
             close_splashscreen,
             set_telemetry_enabled,
             emit_frontend_log,
-            emit_frontend_span
+            emit_frontend_span,
+            take_startup_repository
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");