Use a different worktree base directory for dev (#121)

backend/src/models/task_attempt.rs

@@ -268,15 +268,21 @@ impl TaskAttempt {
 
     /// Get the base directory for vibe-kanban worktrees
     pub fn get_worktree_base_dir() -> std::path::PathBuf {
+        let dir_name = if cfg!(debug_assertions) {
+            "vibe-kanban-dev"
+        } else {
+            "vibe-kanban"
+        };
+
         if cfg!(target_os = "macos") {
             // macOS already uses /var/folders/... which is persistent storage
-            std::env::temp_dir().join("vibe-kanban")
+            std::env::temp_dir().join(dir_name)
         } else if cfg!(target_os = "linux") {
             // Linux: use /var/tmp instead of /tmp to avoid RAM usage
-            std::path::PathBuf::from("/var/tmp/vibe-kanban")
+            std::path::PathBuf::from("/var/tmp").join(dir_name)
         } else {
             // Windows and other platforms: use temp dir with vibe-kanban subdirectory
-            std::env::temp_dir().join("vibe-kanban")
+            std::env::temp_dir().join(dir_name)
         }
     }