feat: add dashboard top source report

docs/development/roadmap.md

@@ -48,6 +48,7 @@ Priority tasks:
 
 Delivered:
 - Dashboard time-series charts show daily mail volume, compliance rate, and failure rate.
+- Top sending sources show DMARC, SPF, and DKIM pass/fail breakdowns on the dashboard.
 
 Quality bar:
 - A domain owner can understand who sends mail as their domain, which sources fail, and what to fix next.

docs/milestones.md

@@ -79,9 +79,9 @@ Goal: convert raw DMARC data into useful operational reporting.
 
 Delivered:
 - Dashboard trend charts for volume, compliance rate, and failure rate.
+- Top sender/source reports with pass/fail breakdowns.
 
 Planned:
-- Top sender/source reports with pass/fail breakdowns.
 - Per-domain report timeline and daily rollups.
 - Exportable reports for a selected domain and date range.
 - Clear recommendations for common cases: unknown source, SPF-only pass, DKIM-only pass, full fail, and policy not enforced.

docs/todo.md

@@ -131,14 +131,14 @@ This file tracks the specific implementation tasks for each milestone of the DMA
 - [x] Integrate Chart.js library
 - [x] Create time-series charts for DMARC compliance
 - [x] Add volume charts for email traffic
-- [ ] Implement sender breakdown visualizations
+- [x] Implement sender breakdown visualizations
 - [ ] Create policy distribution charts
 
 ### Dashboard Widgets
 - [ ] Create compliance rate summary widget
 - [ ] Add enforcement rate widget
 - [x] Implement email volume trends widget
-- [ ] Create top sender sources widget
+- [x] Create top sender sources widget
 - [ ] Add alert status summary (for later integration)
 
 ### Historical Data