Bug: <callout> emoji and background-color/border-color attributes silently ignored

[charosen]

Bug Description

When using docs +create with a <callout> block containing emoji, background-color, or border-color attributes, these attributes are silently ignored in the resulting Feishu document.

Expected behavior: Callout blocks should render with the specified emoji and colors.
Actual behavior: All attributes are ignored; callout renders with default 🎁 emoji and no background/border color.

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Steps to Reproduce

1. Run: lark-cli docs +create --title 'test' --markdown '<callout emoji="✅" background-color="light-green" border-color="green">test</callout>'
2. Open the created document
3. Observe that the callout has no color and shows 🎁 instead of ✅

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Root Cause Analysis

Querying the document blocks via API after creation:

{
  "block_type": 19,
  "callout": {
    "emoji_id": "gift"  // ← should be the original emoji or a valid emoji_id
  },
  // background_color: MISSING
  // border_color: MISSING
}

Two issues identified:

1. Emoji handling: The MCP markdown converter converts emoji characters (e.g. ✅) to their emoji name ("gift"), but Feishu API expects an emoji_id string like "24689_favorite" or the raw emoji character should be passed through.
2. Color attributes: background-color and border-color attributes in <callout> tags are completely ignored and never sent to the Feishu API.

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Test Document

A test document demonstrating the issue: https://www.feishu.cn/docx/HSwjdil66omz7PxgD6hcbpMtnUg

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Environment

• lark-cli version: 1.0.0
• Platform: macOS (darwin/arm64)
• Node.js version: v23.11.0
• Shell: zsh