fix: enhance prompt "Invalid or missing provider" bad request error

[SujalXplores]

Before:

https://github.com/user-attachments/assets/808a5fcc-17cf-4d2b-a679-9ae49f54a0dc

After fix:

https://github.com/user-attachments/assets/5df79e9b-7f25-4002-b7c3-9ed06b6643bb

Type safety improvements:

• app/lib/hooks/usePromptEnhancer.ts: Imported ProviderInfo type and updated the usePromptEnhancer function to use ProviderInfo instead of a string for the provider parameter. [1] [2]
• app/routes/api.enhancer.ts: Imported ProviderInfo type and updated the enhancerAction function to use ProviderInfo instead of a string for the provider parameter. [1] [2] [3]

Consistency improvements:

• app/routes/api.enhancer.ts: Updated the enhancerAction function to use providerName extracted from ProviderInfo and made minor formatting adjustments for consistency. [1] [2]

[SujalXplores]

@wonderwhy-er Raised PR to fix #149 Please check

[wonderwhy-er]

Tested and does help