feat(dashboard): replace custom code blocks with shadcn Card on landing page

[duyet]

Summary

• Replace manual code block divs with Card, CardHeader, CardContent
• Replace feature section divs with Card components
• Replace API endpoints table wrapper with Card component
• Standardize button heights using shadcn size variants (lg, sm)
• Use consistent spacing values (gap-4, gap-3, gap-5)
• Add Table, TableBody, TableCell, TableRow components for API endpoints

Test plan

• Typecheck passes: bunx tsc --noEmit
• Lint passes: bunx biome check packages/dashboard/src/
• Visual verification of landing page code blocks, features, and API endpoints sections

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0f2435c9-d5ed-4b73-a49b-00467779f6ab

📥 Commits

Reviewing files that changed from the base of the PR and between 31904a3 and 9869266.

📒 Files selected for processing (11)

• packages/dashboard/src/app/dashboard/analytics/page.tsx
• packages/dashboard/src/app/dashboard/conversations/page.tsx
• packages/dashboard/src/app/dashboard/project/page.tsx
• packages/dashboard/src/app/docs/page.tsx
• packages/dashboard/src/app/page.tsx
• packages/dashboard/src/components/landing/use-cases.tsx
• packages/dashboard/src/components/project-switcher.tsx
• packages/dashboard/src/components/ui/badge.tsx
• packages/dashboard/src/components/ui/card.tsx
• packages/dashboard/src/components/ui/table.tsx
• packages/dashboard/src/lib/constants.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/landing-page-card-components-1773770558

📝 Coding Plan

• Generate coding plan for human review comments

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