* feat: implement tool usage handling and system prompt building for AI providers
* refactor: streamline tool usage handling and remove unused code in OpenAIProvider and formats
* refactor: simplify tool usage handling in Anthropic and Gemini providers, and update prompt instructions
* refactor: remove unused function calling model checks and simplify MCP tools handling in Inputbar
* hidden tool use in message
* revert import
* Add idx parameter to parseAndCallTools for unique tool IDs
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