1. metrics_query_service: use NULLS LAST in get_recent_tests() so tests
with actual dates always appear before NULL-dated ones.
2. campaign_service: set created_at=datetime.utcnow() when creating tests
from campaigns (was missing, leaving 21 tests with NULL created_at).
Fixed existing NULL values directly in production DB.
3. DashboardPage: add isError handling to all V2 metric widgets
(pipeline, team activity, validation rate, recent tests).
- Add retry:2 to all secondary metric queries so transient failures
are retried before showing empty state.
- Show 'Could not load X — refresh' instead of empty/misleading
'No tests created yet' when a query actually fails.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Implement all main frontend views for the MITRE ATT&CK coverage platform:
- T-026: Dashboard with coverage summary cards and tactic breakdown table
- T-027: Interactive ATT&CK matrix with filtering by status, tactic, platform
- T-028: Technique detail page with tests, intel items, and review actions
- T-029: Test creation form with technique selector and validation
- T-030: Test detail page with drag and drop evidence upload and download
- T-031: System admin panel with MITRE sync and intel scan controls
New components: CoverageSummaryCard, TacticCoverageChart, AttackMatrix, TechniqueCell, TestForm, EvidenceUpload, EvidenceList
New API modules: metrics.ts, techniques.ts, tests.ts, evidence.ts, system.ts
All views use TanStack Query for data fetching with proper loading and error states. Role-based UI controls for admin/lead actions.
