Restructured action inputs into structured objects for an improved user experience.

• Send Message and Generate Text group their optional generation parameters into Generation Config
• Generate Image groups its optional image parameters into Image Settings
• Generate Video groups its optional video parameters into Video Settings
• List Files and List Models group their pagination inputs into Pagination; Fetch All stays a top-level toggle

Updated spectral version

Various modernizations and documentation updates

Added inline data source for files to enable dynamic dropdown selection

Added Vertex AI credential handling for improved authentication reliability

Initial release of the Google Gemini component for text generation and analysis