Fix TypeScript errors, secure config, and add testing infrastructure

[ViVaLaDaniel]

Project Purpose:
PermitPilot is an AI-powered Permit Application Management System designed to assist with identifying permits, generating checklists, and validating applications.

Changes:

1. Bug Fixes:
   • Fixed src/lib/seed-db.ts to correctly use Firebase Firestore Modular SDK (doc() function).
   • Fixed src/components/ui/calendar.tsx to support react-day-picker v9 (replaced IconLeft/IconRight with Chevron).
2. Security:
   • Refactored src/firebase/config.ts to use environment variables.
   • Created .env.local with the existing keys (moved from source).
3. Testing:
   • Added vitest and vite-tsconfig-paths.
   • Added src/lib/utils.test.ts as a sample test.
   • Added test script to package.json.

Future Work / Needed Improvements:

• Code Validator: Implement RAG integration in src/ai/flows/validate-permit-application-against-local-codes.ts to automatically fetch building codes.
• Linting: Resolve ESLint configuration issues.
• Testing: Expand test coverage to include AI flows and components.

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PR created automatically by Jules for task 18259409877844216673 started by @ViVaLaDaniel

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