Sswart patch 1

[sswart]

This pull request includes changes to error handling in the API route and updates to the styling and content of the home page.

Error handling improvement:

• src/app/api/chat/promptflow/route.ts: Added a null check for data and throw an exception if data is null.

Styling and content updates:

• src/app/page.tsx: Modified the header text size and content to reflect a different company name and adjusted padding for category blocks. [1] [2]

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