- Add GL account picker (gl-picker.component.ts) for mapping each product row to a GL account
- Extract shared diff logic into rate-register-diff.util.ts + loan-rate-register-diff.util.ts
- Add rate-register-diff component to render before/after changes for checker approval
- Rewire checker-inbox and view-checker-inbox to show loan interest rate register diffs
- Refactor rate-register.service.ts (mock-to-real HTTP wiring, GL-aware payload mapping)
- Simplify preview-register component, moving diff rendering into the shared diff component
- Add glAccountId field to RateChartRow model
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>