Prompt params (#1949)
* Add support for 'prompt' URL param and draft binding
Introduces a utility to sanitize URL parameters and updates chat window logic to use a 'draft' state instead of 'message'. Both main and model-specific chat pages now support pre-filling the chat input from a 'prompt' URL parameter, and clear the parameter after use. This improves UX for deep-linking and sharing prompts.
* Sanitize URL parameters in model page
Added usage of sanitizeUrlParam for 'q' and 'prompt' URL parameters in the model page to prevent unsafe input. Wrapped parameter handling in a try-catch block to improve error handling and log failures.
