feat(web): scaffold Next.js 16 dashboard with design system and auth client (#82)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/design-tokens/src/fonts.ts

@@ -0,0 +1,33 @@
+/**
+ * Mosaic Stack font definitions.
+ * Outfit (sans) — headings and body.
+ * Fira Code (mono) — code and terminal.
+ */
+
+export const fonts = {
+  sans: {
+    family: 'Outfit',
+    fallback: 'system-ui, -apple-system, sans-serif',
+    stack: "'Outfit', system-ui, -apple-system, sans-serif",
+    weights: {
+      light: 300,
+      regular: 400,
+      medium: 500,
+      semibold: 600,
+      bold: 700,
+    },
+  },
+
+  mono: {
+    family: 'Fira Code',
+    fallback: 'ui-monospace, Menlo, monospace',
+    stack: "'Fira Code', ui-monospace, Menlo, monospace",
+    weights: {
+      regular: 400,
+      medium: 500,
+      bold: 700,
+    },
+  },
+} as const;
+
+export type Fonts = typeof fonts;