Only strip file extension if a file has one

[Mikey032]

Fixes #1734

When a filename lacks an extension, the entire base filename is removed. When files are uploaded through the sidebar's 'New Files' button, the extension is already stripped from the filename. However, uploading files directly via the chat retains the extension. This change enables both scenarios to function while preserving the base filename.

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🚀 This description was created by Ellipsis for commit 43d56bb

Summary:

This PR updates the createFile function to correctly handle filenames with and without extensions, fixing a bug where filenames without extensions were incorrectly stripped.

Key points:

• Updated createFile function in db/files.ts to handle filenames with and without extensions.
• Introduced a check for the presence of a file extension before stripping it.
• Fixes issue where filenames without extensions were incorrectly processed, preserving the base filename.

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Generated with ❤️ by ellipsis.dev

[ellipsis-dev]

❌ Changes requested. Reviewed everything up to 43d56bb in 51 seconds

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