refactor(client): restructure components directory for scalability

- Split components/shared/ (45 files) into domain directories:
  documents/, forms/, layout/, navigation/, section-views/
- Create barrel files (index.ts) for all directories
- Rename PascalCase files to kebab-case in rbac/org-chart/
- Move auth hooks into auth/hooks/ subdirectory
- Merge lib/file-*.ts into single file-utils.tsx
- Update 98 files with new import paths
- TypeScript build: 0 errors