fix: 优化权限提示用词和 Help 页面新手引导

- Help General 页添加 3 步 Getting started 引导，替代单段描述
- 权限对话框底部 "Esc to cancel" → "Esc to reject"，"Tab to amend" → "Tab to add feedback"
- .claude/ 文件夹权限选项标签从 60 字符缩至 49 字符，避免窄终端截断
- 新增 10 个测试覆盖权限提示文案和帮助页引导内容

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/components/permissions/BashPermissionRequest/BashPermissionRequest.tsx

@@ -514,9 +514,9 @@ function BashPermissionRequestInner({
           </Box>
           <Box justifyContent="space-between" marginTop={1}>
             <Text dimColor>
-              Esc to cancel
+              Esc to reject
               {((focusedOption === 'yes' && !yesInputMode) || (focusedOption === 'no' && !noInputMode)) &&
-                ' · Tab to amend'}
+                ' · Tab to add feedback'}
               {explainerState.enabled && ` · ctrl+e to ${explainerState.visible ? 'hide' : 'explain'}`}
             </Text>
             {toolUseContext.options.debug && <Text dimColor>Ctrl+d to show debug info</Text>}