v0.3.0 - Settings overhaul

This was a big one! Lots of quality-of-life improvements.

First, notifications - the app now tells you when a phase changes, even if it’s running in the background. This was the most requested feature from the few friends testing it.

I added auto-start options too, so breaks (and work phases) can start automatically. No more clicking “start” every time.

Data export is now possible in JSON and CSV formats. Not the most exciting feature, but important if you want to analyze your productivity outside the app.

i18n support landed too - English and Spanish for now. The setup is clean enough that adding more languages should be straightforward.

And the big one: the desktop app via with a backend! This was my first time using Wails, and I’m impressed - it feels much more native than Electron, and the binary size is tiny in comparison.