Group context ignores JSON share cards

[PeiPei233]

Description

The built-in GroupChatContext ignores group messages that contain only a Json component. This is common for QQ share cards (for example, Xiaohongshu links). As a result, a later reaction such as "wow" reaches the LLM without the shared card in its group context.

The aiocqhttp adapter preserves the OneBot json segment as a Json component, but Main.on_message() only forwards Plain and Image messages to GroupChatContext, and _format_message() has no Json branch.

Steps to reproduce

1. Enable built-in group context awareness for an aiocqhttp group.
2. Send a QQ share card whose OneBot message contains only a json segment.
3. Send a short follow-up message that refers to the card.
4. Inspect the group context attached to the LLM request.

Actual behavior

The event bus receives the card as [ComponentType.Json], but the card is absent from the group context. The LLM only sees the short follow-up and older messages.

Example log sequence:

[10:49:06] user: [ComponentType.Json]
[10:49:55] user: wow

The LLM request created for the follow-up contains no entry for the 10:49 JSON card.

Expected behavior

JSON share cards should be recorded as a compact, readable context entry using common QQ card metadata such as title, description, and target URL. Unknown card formats should retain a generic placeholder rather than exposing the complete raw payload.

Environment

• AstrBot v4.27.3
• aiocqhttp / OneBot v11
• NapCat

[dosubot]

@PeiPei233 这个 bug 可以精确定位到代码中的两处问题：

问题 1：on_message 的过滤条件

on_message 中只有当消息包含 Plain 或 Image 组件时才会调用 group_chat_context.handle_message() [1]。纯 JSON 卡片消息不含这两者，直接被跳过，根本不会进入上下文记录。

问题 2：_format_message 和 _describe_chain 无 Json 分支

即使消息进入了 handle_message()，_format_message() 也只处理 Plain、Image、At、Reply 四种组件类型 [2]。同样，_describe_chain() 也没有 Json 的分支，遇到它会退化为 [Json] 的类名占位符 [3]。此外 group_chat_context.py 的 import 列表中也没有包含 Json。

修复方向：

1. main.py：将 has_image_or_plain 的判断扩展，加入 Json 组件检测（或改为只要消息非空就记录，不限定特定类型）。
2. _format_message：添加 Json 分支，从 comp.data 中提取常见字段（如 prompt、meta.detail_1.title、meta.detail_1.desc、meta.detail_1.url）拼出可读描述。
3. _describe_chain：同样添加 Json 分支，确保引用卡片消息时也能被正确描述。

这个问题与 #9565 报告的根因一致（B站小程序卡片被引用后 bot 看不到内容）[4]。

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