chore: categorize Storybook stories, add shadcn components, and apply Figma UI3 theming

[bromso]

Summary

• Categorize Storybook stories into MUI-style subdirectories (Inputs, Data Display, Feedback, Layout, Navigation, Surfaces)
• Add all remaining shadcn components (45+ total) with full exports from @repo/ui
• Add comprehensive tests for interactive components (dialog, overlay, menu, input, checkbox, etc.)
• Apply Figma UI3 theming via CSS-only token swap + data-slot overrides in styles.css — zero .tsx component modifications
• Fix CI type-check errors (tsconfig path alias, pagination prop duplication, unused import)

Test plan

• bun run test — 90 tests pass across all packages
• bun run types — all packages type-check clean
• bun run lint — @repo/ui passes (pre-existing @repo/docs lint issues unrelated)
• Visual verification via bun run storybook in both light and dark modes

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