* fix: Use correct endpoint for file validation in agent panel uploads
Agent panel file uploads (FileSearch, FileContext, Code/Files) were validating against the active conversation's endpoint config instead of the agents endpoint config. This caused incorrect file size limits when the active chat used a different endpoint.
Add endpointOverride option to useFileHandling so callers can specify the correct endpoint for validation independent of the active conversation.
* fix: Use agents endpoint config for agent panel file upload validation
Agent panel file uploads (FileSearch, FileContext, Code/Files) validated
against the active conversation's endpoint config instead of the agents
endpoint config. This caused wrong file size limits when the active chat
used a different endpoint.
Adds endpointOverride to useFileHandling so callers can specify the
correct endpoint for both validation and upload routing, independent of
the active conversation.
* test: Add unit tests for useFileHandling hook to validate endpoint overrides
Introduced comprehensive tests for the useFileHandling hook, ensuring correct behavior when using endpoint overrides for file validation and upload routing. The tests cover various scenarios, including fallback to conversation endpoints and proper handling of agent-specific configurations, enhancing the reliability of file handling in the application.
* feat: add filterFilesByEndpointConfig to filter disabled file processing by provider
* chore: explicit define of endpointFileConfig for better debugging
* refactor: move `normalizeEndpointName` to data-provider as used app-wide
* chore: remove overrideEndpoint from useFileHandling
* refactor: improve endpoint file config selection
* refactor: update filterFilesByEndpointConfig to accept structured parameters and improve endpoint file config handling
* refactor: replace defaultFileConfig with getEndpointFileConfig for improved file configuration handling across components
* test: add comprehensive unit tests for getEndpointFileConfig to validate endpoint configuration handling
* refactor: streamline agent endpoint assignment and improve file filtering logic
* feat: add error handling for disabled file uploads in endpoint configuration
* refactor: update encodeAndFormat functions to accept structured parameters for provider and endpoint
* refactor: streamline requestFiles handling in initializeAgent function
* fix: getEndpointFileConfig partial config merging scenarios
* refactor: enhance mergeWithDefault function to support document-supported providers with comprehensive MIME types
* refactor: user-configured default file config in getEndpointFileConfig
* fix: prevent file handling when endpoint is disabled and file is dragged to chat
* refactor: move `getEndpointField` to `data-provider` and update usage across components and hooks
* fix: prioritize endpointType based on agent.endpoint in file filtering logic
* fix: prioritize agent.endpoint in file filtering logic and remove unnecessary endpointType defaulting
