修复一个系统信息被错误展示给用户bug

[phantom5099]

No description provided.

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[fennoai]

Reviewed in four passes. I found 1 functional regression in the changed hunk; no additional noteworthy performance, security, or documentation issues.

[fennoai]

message.Role == roleSystem is broader than the bug you are trying to suppress. system messages are also used for transcript inline logs and decision/verify/tool entries, so this change removes the content that should become visible after expanding a folded process segment. Existing tests already cover this regression (TestTranscriptEnterTogglesFoldedProcessVisibility and TestTranscriptMouseClickFoldPlaceholderExpandsProcess both fail with this patch). Filter only the unintended system notice shape here instead of dropping every system message.

[phantom5099]

@xgopilot 给我修复编译错误问题

[fennoai]

已完成

已把修复提交并推送到当前 PR 分支 phantom5099/main，提交为 a3dbb277。

本次处理内容：

• 将 transcript 中对 system 消息的过滤收窄为“仅隐藏普通系统提示”，保留 inline log，避免过程折叠/展开内容被误删。
• 新增回归测试，覆盖“普通 system 提示不展示给用户、inline log 仍保留”的场景。

验证结果：

• go build ./... 通过
• go test ./internal/tui/core/app/... 通过

未处理项：

• go test ./... 仍会在 internal/gateway/client 命中一个已有并发测试失败；该问题与这次 TUI 修复无关，本次未改动。

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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