bugfix: consider excluding filetype from file search

[whyboris]

😓 current bug: if you search for the number 4 in the file search filter, the results are not what you expect

This is because many files end with .mp4 😓 -- thus showing you more results than you expect.

Leaving this issue to remember to fix it 👍 and to welcome a discussion (for suggestions / thoughts) 🤝