feat: upgrade to gnexus-ui-kit 1.0, adopt Verdant color theme ...

Kit 0.4.0 → 1.0.0 (git dep pinned to master): rounded panels, softer
accents, tabs as segment switcher, page-header scan animation removed
by the kit itself. Custom overrides dropped where the kit now handles
them (48px topbar brand).

Theme: kit-verdant.css import (exports map only whitelists kit.css in
1.0 — theme file resolved through a vite alias until the kit ships
theme exports). Chart palette rebuilt for Verdant and re-validated
(L 0.48–0.67, chroma, CVD, contrast on #1E2522). Logo/favicon
recolored to the Verdant hues. allow-git=git.gnexus.space in .npmrc
for npm 12 git dependencies.

Co-Authored-By: Claude Code <noreply@anthropic.com>