feat(ui): Appearance settings — dark/light/system mode and named themes; fix Add lane silently doing nothing (#42)
- Settings → Appearance: mode Dark / Light / System (follows the OS live) and a named theme remembered per mode — dark: Default, Darcula, Apple Dark; light: Default, Apple Light, IntelliJ Light, Canvas. Each theme is a CSS-variable override block keyed by `data-theme` on <html>; the sidebar quick toggle gains System and swaps between the two remembered themes. - An inline boot script in index.html applies the stored mode and theme before first paint, so a reload no longer flashes the default colours. - Diff +/- rows are easier to tell apart on every theme: a /20 status tint, a 3px status bar and a bold coloured marker; the changed-span emphasis no longer vanishes on light themes. - #42: the Add-lane modal (Repo mode / "Current branch") asks POST /api/lanes/ensure with `exact: true`. Without it a folder nested inside an existing lane resolved to that parent lane with created:false, so the modal closed and no new card appeared. When the folder really already has a lane, the modal now says which one instead of closing. Closes #42
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