Fix: Validate filenames consisting solely of extensions

[LeonardoLarranaga]

Description

This pull request resolves an issue where supported files with only extensions (e.g., .env, .gitignore) were not displaying their correct icons.

Related Issues

• closes 🐞 Icons not displayed correctly for files with only extensions #1801

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

Before:

After:

[thecoolwinter]

This looks good to me, there is one edge case created by taking the first result. For instance this file should be a yaml file icon. Could you reverse the check? So we first check if there's a valid file extension, then do your check for the prefixed filename. Then if that all fails we do a txt file.

[LeonardoLarranaga]

@thecoolwinter Working on it!

[thecoolwinter]

Perfect!

[thecoolwinter]

@allcontributors please add @LeonardoLarranaga for code

[allcontributors]

@thecoolwinter

I've put up a pull request to add @LeonardoLarranaga! 🎉