Display custom register label in title bar

[ribose-jeffreylau]

Requested by @maccraymer

Motivation

Currently, custom register labels are not displayed prominently in the window, so the only way to tell the registers apart is to hover on top of one of the top icons to see the Git origin of the current register. This is error prone, as it is a common case when multiple registers of the same name but different labels are being worked on at the same time.

Ideas

Custom labels can be displayed somewhere around here:

registry-kit/src/views/index.tsx

Line 114 in ba24c83

<Helmet><title>{registerMetadata?.name ?? "Unnamed registry"}</title></Helmet>