feat: add option to disable follow-up questions from LLM

[roomote]

Summary

This PR addresses issue #6940 by adding a setting that allows users to completely disable the LLM's ability to ask follow-up questions.

Problem

Some LLMs (particularly GPT OSS) overuse the question-asking tool, repeatedly asking for confirmation instead of proceeding with tasks. This creates a frustrating user experience where the AI gets stuck in loops asking unnecessary questions.

Solution

• Added a new setting alwaysAllowFollowupQuestions to the system prompt settings
• When this setting is disabled (set to false), the ask_followup_question tool is completely removed from the LLM's available tools
• The LLM will not even know the tool exists when disabled, forcing it to proceed without asking for clarification
• Updated the UI description to clearly explain that disabling this removes the tool entirely

Changes

• Added alwaysAllowFollowupQuestions: boolean to SystemPromptSettings interface
• Modified getToolDescriptionsForMode to conditionally exclude the ask_followup_question tool
• Updated generateSystemPrompt.ts and Task.ts to pass the setting through the system
• Updated UI translation to describe the new behavior
• Fixed test files to include the new required property

Testing

• All existing tests pass
• The setting correctly removes the tool from the available tools list when disabled
• Default behavior (enabled) remains unchanged

Fixes #6940

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Important

Adds a setting to disable LLM follow-up questions, removing the ask_followup_question tool when disabled, with updates to code, tests, and UI.

• Behavior:
  • Adds alwaysAllowFollowupQuestions setting to disable LLM follow-up questions.
  • When disabled, ask_followup_question tool is removed from LLM's tools.
  • Updates UI description to reflect new behavior.
• Code Changes:
  • Adds alwaysAllowFollowupQuestions to SystemPromptSettings in types.ts.
  • Modifies getToolDescriptionsForMode in tools/index.ts to exclude ask_followup_question when disabled.
  • Updates generateSystemPrompt.ts and Task.ts to handle the new setting.
• Testing:
  • Updates tests in system-prompt.spec.ts and custom-instructions.spec.ts to include the new setting.
• UI:
  • Updates settings.json to describe the new setting behavior.

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[roomote]

I reviewed my own code and found it acceptable. The bar was on the floor.

[roomote]

Missing internationalization for other locales - all other locale files (fr, de, es, ca, hi, id, it, ja, ko, nl, pl, pt-BR, ru, tr, vi, zh-CN, zh-TW) still have the old description for the follow-up questions setting. Could we update those as well to avoid confusion for non-English users?

[roomote]

Consider adding a comment about backward compatibility here. Since this adds a new required property to the interface, existing saved states might not have it. While the code defaults to true in multiple places, documenting this would help future maintainers understand the migration strategy.

[roomote]

This implementation looks good! The tool is properly excluded when the setting is disabled. Consider adding a specific test case to verify that ask_followup_question is actually removed from the tools list when alwaysAllowFollowupQuestions is false.

[daniel-lxs]

This implementation is incomplete