Add web_search tool and wire into prompts, tools, and UI

[hannesrudolph]

Motivation

• Provide a web search tool so the assistant can retrieve up-to-date external information similar to Cline's websearch capability.
• Expose web search as a native tool so models can call it via function/tool calling and receive structured results.
• Integrate web search into the system prompt/tool catalog and UI so it is discoverable and follows existing tool approval/workflow.

Description

• Implemented WebSearchTool at src/core/tools/WebSearchTool.ts which queries DuckDuckGo JSON API, normalizes results, enforces timeouts and max_results, and uses the existing approval/result push flow.
• Registered web_search in types and shared tool registries (packages/types/src/tool.ts, src/shared/tools.ts) and added native tool schema (src/core/prompts/tools/native-tools/web_search.ts) and XML-style description (src/core/prompts/tools/web-search.ts).
• Wired execution into the tool dispatch path (presentAssistantMessage) and added filtering so web_search is included in the browser group and respects browserToolEnabled settings.
• Updated UI and CLI renderers and localization to surface web search asks/results (webview-ui/src/components/chat/ChatRow.tsx, many webview-ui locale files, apps/cli renderer files).

Testing

• Ran repository lint via turbo lint --log-order grouped --output-logs new-only as part of the commit hooks and the lint step completed successfully.
• Pre-commit formatting and repository tasks ran as part of the commit flow and completed without errors.

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Codex Task

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Important

Introduces WebSearchTool for real-time web searches via DuckDuckGo, integrating it into the system's tool dispatch and UI components.

• Behavior:
  • Adds WebSearchTool in WebSearchTool.ts to query DuckDuckGo API, normalize results, enforce timeouts, and handle max_results.
  • Integrates web_search into tool dispatch in presentAssistantMessage and respects browserToolEnabled settings.
• Tool Registration:
  • Registers web_search in tool.ts, vscode-extension-host.ts, and shared/tools.ts.
  • Adds native tool schema in native-tools/web_search.ts and description in web-search.ts.
• UI Updates:
  • Updates ChatRow.tsx to display web search results.
  • Adds localization for web search in multiple locale files.
• Testing:
  • Linting and formatting checks passed successfully.

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[roomote]

Oroocle   See task on Roo Cloud

Review completed. Flagged a couple of small inconsistencies to address before merging.

• Make web_search native schema match docs: max_results should be optional (remove from required).
• Align CLI tool categorization for web_search (currently treated as browser-disabled tool, but shown as search in CLI).

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

[roomote]

max_results is described as optional, but the native tool schema marks it as required (required: ["query", "max_results"]). With strict: true, this forces the model to always send max_results and can lead to validation failures if it omits it. Consider removing max_results from required and keeping the runtime defaulting in the tool implementation.

_{Fix it with Roo Code or mention @roomote and request a fix.}

[roomote]

web_search is treated as a browser tool in filtering (browserToolEnabled) and grouped under browser, but it is categorized as a search tool in the CLI UI. This mismatch is confusing for users and makes browser enable/disable semantics harder to reason about. Consider categorizing webSearch/web_search under the browser tool group in the CLI UI as well.

_{Fix it with Roo Code or mention @roomote and request a fix.}