* refactor: Simplify grid column calculation in SourcesGroup component
* refactor: Centralize default agent capabilities and simplify capability assignment
* Edge case: use defined/fallback capabilities for ephemeral agents when the "agents" endpoint is not enabled
* refactor: consolidate gemini 2 vision check
* feat: enhance capability check logging for agents
* chore: update librechat-data-provider version to 0.7.86
* refactor: import default agent capabilities for enhanced capability management
* chore: standardize quotes in error message check for consistency
* fix: improve error logging both client and api-side for mistral ocr upload errors
* ci: update error handling in MistralOCR tests to use specific error message