feat(terminal,cli): docker_extra_args + display.timestamps

Two independent opt-in QoL toggles, both off by default.

terminal.docker_extra_args:
- List of extra flags appended verbatim to docker run after security
  defaults. Useful for adding capabilities (e.g. --cap-add SETUID) or
  other docker run options not exposed by existing config keys.
- Non-string entries are logged and skipped.
- Also available via TERMINAL_DOCKER_EXTRA_ARGS='[...]' env var.

display.timestamps:
- Appends [HH:MM] to user input bullet and the assistant response box
  header. Single hub in _format_submitted_user_message_preview()
  covers both single-line and multi-line user previews; assistant
  response label gets the timestamp at box-open time.

Closes #1569 (timestamps).

Co-authored-by: Mibayy <Mibayy@users.noreply.github.com>

tools/terminal_tool.py

@@ -1087,6 +1087,7 @@ def _get_env_config() -> Dict[str, Any]:
         "docker_volumes": _parse_env_var("TERMINAL_DOCKER_VOLUMES", "[]", json.loads, "valid JSON"),
         "docker_env": _parse_env_var("TERMINAL_DOCKER_ENV", "{}", json.loads, "valid JSON"),
         "docker_run_as_host_user": os.getenv("TERMINAL_DOCKER_RUN_AS_HOST_USER", "false").lower() in ("true", "1", "yes"),
+        "docker_extra_args": _parse_env_var("TERMINAL_DOCKER_EXTRA_ARGS", "[]", json.loads, "valid JSON"),
     }
 
 
@@ -1129,6 +1130,7 @@ def _create_environment(env_type: str, image: str, cwd: str, timeout: int,
     volumes = cc.get("docker_volumes", [])
     docker_forward_env = cc.get("docker_forward_env", [])
     docker_env = cc.get("docker_env", {})
+    docker_extra_args = cc.get("docker_extra_args", [])
 
     if env_type == "local":
         return _LocalEnvironment(cwd=cwd, timeout=timeout)
@@ -1144,6 +1146,7 @@ def _create_environment(env_type: str, image: str, cwd: str, timeout: int,
             forward_env=docker_forward_env,
             env=docker_env,
             run_as_host_user=cc.get("docker_run_as_host_user", False),
+            extra_args=docker_extra_args,
         )
     
     elif env_type == "singularity":
@@ -1792,6 +1795,7 @@ def terminal_tool(
                                 "docker_forward_env": config.get("docker_forward_env", []),
                                 "docker_env": config.get("docker_env", {}),
                                 "docker_run_as_host_user": config.get("docker_run_as_host_user", False),
+                                "docker_extra_args": config.get("docker_extra_args", []),
                             }
 
                         local_config = None