feat: warn users when too many MCP tools are enabled

[roomote]

Closes ROO-542.

Summary

• Warn when enabled MCP tools exceed MAX_MCP_TOOLS_THRESHOLD to reduce model confusion; export the threshold via shared types and CLI constants for reuse.
• Emit too_many_tools_warning chat rows from task flow and render a new warning UI using the reusable WarningRow component plus translated copy for tool/server counts.
• Add tests covering MCP tool counting rules, warning rendering, docs link behavior, and updated locales.

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Important

Introduces a warning system for excessive MCP tools to prevent model confusion, with UI updates and tests.

• Behavior:
  • Warns when enabled MCP tools exceed MAX_MCP_TOOLS_THRESHOLD to prevent model confusion.
  • Emits too_many_tools_warning chat rows in Task.ts and renders warning UI using WarningRow.
• Constants:
  • Exports MAX_MCP_TOOLS_THRESHOLD in constants.ts and mcp.ts.
• UI Components:
  • Adds TooManyToolsWarning and WarningRow components in ChatRow.tsx.
• Tests:
  • Adds tests for tool counting, warning rendering, and locale updates in TooManyToolsWarning.spec.tsx and WarningRow.spec.tsx.
• Locales:
  • Updates translations for warning messages in multiple locale files.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The new commits successfully move the tool counting logic from frontend to backend, add the warning as a ClineSay message type that persists in task history, and improve i18n with proper pluralization support for all 18 locales.

Previous reviews

• 9fd6e6f: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The implementation correctly warns users when too many MCP tools are enabled (>40). Backend tool counting logic properly filters disabled/disconnected servers and disabled tools, emits a persistent warning message in task history, and the frontend renders it with proper i18n pluralization support.

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}