feat(web): drop material gloss, full punktfunk theme for Scalar, center mobile tabs

- console: remove @unom/ui's specular "material" gloss (drop UnomProviders +
  the material.css import) so components render flat like the marketing site;
  the violet brand + Geist stay.
- mobile bottom tab bar: center the labels (w-full text-center, leading-tight)
  and even out the per-tab layout.
- docs /api: roll the punktfunk dark-violet palette across the whole Scalar
  reference (surfaces/text/sidebar/links/buttons/method colours via the full
  --scalar-* token set), locked to dark (hideDarkModeToggle).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/styles.css

@@ -1,9 +1,6 @@
 @import 'tailwindcss';
 @import 'tw-animate-css';
 @import './timing-functions.css';
-/* @unom/ui's specular "material" gloss layer (.material / .material-fx). Colours
-   derive from --neutral / --neutral-accent via the --mat-* knobs it ships. */
-@import '@unom/ui/styles/material.css';
 
 @custom-variant dark (&:is(.dark *));