Migrate designTokens imports to @policyengine/design-system

[SakshiKekre]

Summary

After PR #494 merges, update all imports from app/src/designTokens to use @policyengine/design-system/tokens directly, then delete the re-export wrapper files.

Details

• 127 imports across 102 files need updating
• Current wrappers in app/src/designTokens/*.ts just re-export from the package
• Mechanical change: find/replace import paths

Files to delete after migration

• app/src/designTokens/colors.ts
• app/src/designTokens/spacing.ts
• app/src/designTokens/typography.ts

Import patterns to update

@/designTokens → @policyengine/design-system/tokens
../designTokens → @policyengine/design-system/tokens
../../designTokens → @policyengine/design-system/tokens

Related: PR #494

[policyengine]

⏸️ PR #494 hasn't merged yet - the @policyengine/design-system package doesn't exist in the current codebase. This issue depends on #494 being merged first.

I can see from the PR diff that #494 will add:

• packages/design-system/ package with exports at @policyengine/design-system/tokens
• Dependency @policyengine/design-system: "*" in app/package.json

Once #494 merges, I'll be able to migrate the 127 imports across 102 files.