fix(storage_setup): resolve setup flow issues for both GitHub and local modes

- Fix async step handle being cleared prematurely, causing setup to hang
  at "Validating token" step while subsequent steps completed silently
- Fix incorrect "Storage already configured" error when a git repo exists
  at the default storage path but hasn't been configured yet

Author: serkanyersen

src/app.rs

@@ -241,8 +241,12 @@ impl App {
             if let Some(handle) = &mut self.setup_step_handle {
                 match handle.receiver.try_recv() {
                     Ok(Ok(result)) => {
+                        // Note: handle_setup_step_result may set a NEW setup_step_handle
+                        // for the next step in the Continue case. We must NOT clear it here.
+                        // The old receiver is already consumed by try_recv() returning Ok.
                         self.handle_setup_step_result(result)?;
-                        self.setup_step_handle = None;
+                        // Don't set setup_step_handle = None here! handle_setup_step_result
+                        // manages it: sets new handle for Continue, leaves as-is for Complete/Failed
                     }
                     Ok(Err(e)) => {
                         error!("Setup step failed: {}", e);
@@ -1362,6 +1366,9 @@ impl App {
                 profiles,
                 is_new_repo,
             } => {
+                // Clear the step handle - setup is complete
+                self.setup_step_handle = None;
+
                 // Update config with GitHub info
                 self.config.github = Some(github_config.clone());
                 self.config.repo_name = github_config.repo;
@@ -1402,6 +1409,9 @@ impl App {
                 error_message,
                 cleanup_repo,
             } => {
+                // Clear the step handle - setup failed
+                self.setup_step_handle = None;
+
                 crate::services::StorageSetupService::cleanup_failed_setup(
                     &mut self.config,
                     &self.config_path,

src/screens/storage_setup.rs

@@ -1250,9 +1250,9 @@ impl Screen for StorageSetupScreen {
     }
 
     fn on_enter(&mut self, ctx: &ScreenContext) -> Result<()> {
-        // Check if already configured
-        let is_configured =
-            !ctx.config.repo_path.as_os_str().is_empty() && ctx.config.repo_path.exists();
+        // Check if already configured using the proper method
+        // This checks: GitHub mode with github config, OR Local mode with .git existing
+        let is_configured = ctx.config.is_repo_configured();
 
         if is_configured {
             // Reconfiguration mode - pre-fill with existing values