* update font with jetbrains mono v2.225 and the current converter
* added the tff file for JetBrains Mono to ensure everybody is using the same version
Co-authored-by: Florian <florian@florian-thinkpad.local>
* built timer app
* Style improvements
* making sure buttons stay hidden when the app is reopened and reappear after the timer runs out
* more sensible calculations of time deltas. eliminated that mysterious scaling factor
* changing the timer icon
