fix: add timeout handling for Docker operations and improve error messages

- Add SandboxInitializationError exception for sandbox/Docker failures
- Add 60-second timeout to Docker client initialization
- Add _exec_run_with_timeout() method using ThreadPoolExecutor for exec_run calls
- Catch ConnectionError and Timeout exceptions from requests library
- Add _handle_sandbox_error() and _handle_llm_error() methods in base_agent.py
- Handle sandbox_error_details tool in TUI for displaying errors
- Increase TUI truncation limits for better error visibility
- Update all Docker error messages with helpful hint:
  'Please ensure Docker Desktop is installed and running, and try running strix again.'

strix/interface/utils.py

@@ -722,9 +722,10 @@ def check_docker_connection() -> Any:
         error_text.append("DOCKER NOT AVAILABLE", style="bold red")
         error_text.append("\n\n", style="white")
         error_text.append("Cannot connect to Docker daemon.\n", style="white")
-        error_text.append("Please ensure Docker is installed and running.\n\n", style="white")
-        error_text.append("Try running: ", style="dim white")
-        error_text.append("sudo systemctl start docker", style="dim cyan")
+        error_text.append(
+            "Please ensure Docker Desktop is installed and running, and try running strix again.\n",
+            style="white",
+        )
 
         panel = Panel(
             error_text,