fix(lark-im): remove corner_radius from column in metric-card example

[catcatcash]

修复 #2371。

lark-im-card-style.md 第 3 节指标卡示例里，corner_radius 写在了 column 上。卡片 2.0 的 column 不支持这个属性，照着示例发的卡片会被平台拒绝（200621 unknown property），错误只在发送时才暴露。

改动两处：

• 示例里删掉 column 上的 corner_radius（background_style / padding / vertical_spacing 保留，这些合法）
• 加一行提醒：column 不支持圆角，需要圆角的场景包一层 interactive_container（第 4 节就是这个写法）

纯文档改动，没动代码。

Summary by CodeRabbit

• Documentation
  • Clarified KPI card styling guidance for rounded corners.
  • Updated the KPI example to remove an unsupported setting and recommend the appropriate alternative.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: db85c4b5-1427-4b66-8e8b-c3a8f0b8464b

📥 Commits

Reviewing files that changed from the base of the PR and between 9b231d9 and d068d3c.

📒 Files selected for processing (1)

• skills/lark-im/references/card/lark-im-card-style.md

Included review availability: Your plan includes up to 10 reviews per rolling hour; 9 remain after this review.

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📝 Walkthrough

Walkthrough

The KPI card documentation now identifies column.corner_radius as unsupported, documents the resulting error, recommends interactive_container for rounded corners, and removes the property from the KPI example.

Changes

KPI card guidance

Layer / File(s)	Summary
Correct column corner radius guidance skills/lark-im/references/card/lark-im-card-style.md	The guidance warns that column.corner_radius causes error 200621 unknown property. The KPI example removes the unsupported property and recommends interactive_container for rounded corners.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to d068d

This localized documentation correction removes an unsupported card property and clarifies the supported alternative; no actionable merge-blocking risk remains after normal checks and review.

Possibly related issues

• larksuite/cli#2371 — The issue addresses the same corner_radius misuse on column.

Suggested reviewers: liangshuo-1

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main documentation fix: removing the unsupported corner_radius property from the metric-card column example.
Description check	✅ Passed	The description clearly explains the issue, scope, specific changes, affected error, and that this is a documentation-only change, although it does not use the repository template headings or include a test plan.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests

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[logarithmone1128]

Reviewed against the original 200621 reproduction and the card 2.0 component reference. This removes the unsupported column.corner_radius field while preserving the supported column styling, and the interactive_container guidance points to the correct rounded-corner alternative. This fully addresses the reported documentation defect.