[ENHANCEMENT] Add Storybook for frontend component development

[kilodesodiq-arch]

Engineering Gap

30+ frontend components without isolated development environment. No visual regression testing or component catalog.

Codebase Evidence

• app/frontend/src/components/: 30+ components across 6 subdirectories
• No Storybook or Ladle configuration

Risk Profile

Slower UI iteration. Inconsistent component API discovery.

Remediation Strategy

Add Storybook 8 with React + Tailwind support. Document each component with stories for all states.

Success Conditions

• Storybook configured with Tailwind
• Stories for top 10 components
• CI build step for Storybook

Change Surface

New: app/frontend/.storybook/, *.stories.tsx files

Security Review

No security impact.

Completion Checklist

• Storybook configured
• Stories created
• Ready for merge