fix(settings): center SettingToggle knob

[verbaux]

The knob was rendered via ::after on <input type="checkbox">. Pseudo-elements on void elements have implementation-defined behavior; on WebKit (Tauri/macOS) the knob landed below the center of the track.

Rewrite as <label> + peer sr-only <input> + two <span aria-hidden> for track and knob. Vertical centering comes from flex items-center on the label (geometric, no transform). Same size, colors, and API.

Noticed while reading SettingControls.tsx referenced in #195.

Before / After

Before	After

Test plan

• pnpm typecheck clean
• pnpm lint clean
• pnpm test — 31/31 pass (one assertion updated to query the label, where cursor-not-allowed now lives)
• Manual: click, keyboard (Space), disabled state, animation

[debba]

Hey :)
Looks wonderful, I will check better and merge ASAP.
Are you interested in #195 ?
We are looking for contributors in that area.

[verbaux]

Hi @debba!
I'm a developer, not a designer, so I can't lead the visual direction or propose a palette/logo from scratch. But I'm happy to help with implementation.

If I spot inconsistencies along the way, I'll keep fixing them. Also, I'd love to help with localisation into Russian, if you don't mind.

[debba]

@verbaux sure feel free to open a PR for localisation