Condensed timeline display option for autopilot mode

Description:

When running in autopilot mode, the agent executes many tool calls in sequence. Currently, each tool call shows:

- Description label
- Full command preview (2-3 lines)
- Output summary ("51 lines...")

Request: Add a display option for autopilot mode that collapses each tool call to just the description label, e.g.:

● Extract authorized scopes section (shell) ▸
● Extract Bitbucket repo mapping (shell) ▸
● Create REF_SCOPES.md (file) ▸

The ▸ or similar indicator would show it's expandable. Pressing Ctrl+O/Ctrl+E would still expand as today.

Why: In autopilot mode, users primarily monitor progress via descriptions, not command details. A condensed view would:

1. Show more activity on screen at once
2. Reduce visual noise during long autonomous runs
3. Make it easier to spot when the agent pauses for input

Suggested implementation:

- New config option: display.autopilotCondensed: true
- Or a /display slash command to toggle verbosity levels

首先追踪 autopilot 工具调用的渲染方式，以及现有 Ctrl+O/Ctrl+E 展开行为的处理方式。然后检查显示配置和 slash-command 路径，以确定详细程度选项应放在哪里。完成标准是 autopilot 能够仅显示带有展开指示器的工具调用描述，同时保留当前的展开控件。

由索引模型根据 Issue 内容生成。