Add v2 Text typography primitive

Implement the first v2 typography component from the Probo Radix UI
Figma: a Text primitive rendering a single span with size, weight,
align, color, and highContrast variants (color x highContrast
resolves to the sand/gold/red/green/amber/sky text step 11 or 12),
plus a paired TextSkeleton. Styling is tailwind-variants only, with
the scale shared through a variants module per the kit guides.

Stand up a theme-isolated v2 Storybook (.storybook-v2) loading the
v2 theme with a light/dark toggle, since v1 and v2 cannot share one
Tailwind build; the v1 build now excludes src/v2.

Signed-off-by: Émile Ré <emile@probo.com>

packages/ui/package.json

@@ -7,6 +7,8 @@
   "main": "src/index.ts",
   "scripts": {
     "dev": "storybook dev -p 6006 --no-open",
+    "dev:v2": "storybook dev -p 6007 -c .storybook-v2 --no-open",
+    "build:v2": "storybook build -c .storybook-v2",
     "check": "tsc --noEmit -p tsconfig.app.json",
     "icons": "bun run src/Atoms/Icons/generator.ts"
   },