feat(frontend): complete KYC flow integration and improve stability

• Completed and aligned the KYC frontend journey across key screens (documents, personal info, selfie, review, status).

• Added/updated KYC service integration to support API communication and flow consistency.

• Improved stability and UX behavior in dashboard-related KYC interactions.

• Updated KYC pages:

  • src/pages/KycDocuments.tsx
  • src/pages/KycPersonalInfo.tsx
  • src/pages/KycSelfie.tsx
  • src/pages/KycReview.tsx
  • src/pages/KycStatus.tsx

• Updated dashboard integration:

  • src/pages/Dashboard.tsx
  • src/pages/InvestorDashboard.tsx

• Added service layer:

  • src/services/kycService.ts

• Updated lockfile:

  • package-lock.json

Validation

• Verified navigation and transitions across KYC steps.
• Verified frontend/API interaction for selfie/review/status flows.
• Confirmed local run and regression checks on modified screens.