feat: auto fit monitors to preview pane

[fiffeek]

What does this PR do?

Adds T tui keybind to fix monitors to screen, by default it's run on the first render as well.
When editing monitors it centers on the monitor center, rather than left corner.

Why is this change important?

Requested by users, better UX.

How to test this PR locally?

make pre-push

Related issues

Closes #74

[github-actions]

Package	Line Rate	Health
/home/runner/work/hyprdynamicmonitors/hyprdynamicmonitors	100%	✔
github.com/fiffeek/hyprdynamicmonitors/cmd	91%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/app	66%	➖
github.com/fiffeek/hyprdynamicmonitors/internal/config	84%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/dial	47%	❌
github.com/fiffeek/hyprdynamicmonitors/internal/filewatcher	68%	➖
github.com/fiffeek/hyprdynamicmonitors/internal/generators	84%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/hypr	79%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/matchers	99%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/notifications	56%	➖
github.com/fiffeek/hyprdynamicmonitors/internal/power	78%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/profilemaker	68%	➖
github.com/fiffeek/hyprdynamicmonitors/internal/reloader	85%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/signal	68%	➖
github.com/fiffeek/hyprdynamicmonitors/internal/tui	90%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/userconfigupdater	81%	✔
github.com/fiffeek/hyprdynamicmonitors/internal/utils	70%	➖
Summary	84% (5729 / 6801)	✔