Add DAST, graph modules, toast notifications, and dashboard enhancements

Add DAST scanning and code knowledge graph features across the stack:
- compliance-dast and compliance-graph workspace crates
- Agent API handlers and routes for DAST targets/scans and graph builds
- Core models and traits for DAST and graph domains
- Dashboard pages for DAST targets/findings/overview and graph explorer/impact
- Toast notification system with auto-dismiss for async action feedback
- Button click animations and disabled states for better UX

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

compliance-core/src/models/mod.rs

@@ -1,12 +1,22 @@
 pub mod cve;
+pub mod dast;
 pub mod finding;
+pub mod graph;
 pub mod issue;
 pub mod repository;
 pub mod sbom;
 pub mod scan;
 
 pub use cve::{CveAlert, CveSource};
+pub use dast::{
+    DastAuthConfig, DastEvidence, DastFinding, DastScanPhase, DastScanRun, DastScanStatus,
+    DastTarget, DastTargetType, DastVulnType,
+};
 pub use finding::{Finding, FindingStatus, Severity};
+pub use graph::{
+    CodeEdge, CodeEdgeKind, CodeNode, CodeNodeKind, GraphBuildRun, GraphBuildStatus,
+    ImpactAnalysis,
+};
 pub use issue::{IssueStatus, TrackerIssue, TrackerType};
 pub use repository::{ScanTrigger, TrackedRepository};
 pub use sbom::{SbomEntry, VulnRef};