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-dashboard/src/components/sidebar.rs

@@ -40,6 +40,16 @@ pub fn Sidebar() -> Element {
             route: Route::IssuesPage {},
             icon: rsx! { Icon { icon: BsListTask, width: 18, height: 18 } },
         },
+        NavItem {
+            label: "Code Graph",
+            route: Route::GraphIndexPage {},
+            icon: rsx! { Icon { icon: BsDiagram3, width: 18, height: 18 } },
+        },
+        NavItem {
+            label: "DAST",
+            route: Route::DastOverviewPage {},
+            icon: rsx! { Icon { icon: BsBug, width: 18, height: 18 } },
+        },
         NavItem {
             label: "Settings",
             route: Route::SettingsPage {},
@@ -58,6 +68,12 @@ pub fn Sidebar() -> Element {
                     {
                         let is_active = match (&current_route, &item.route) {
                             (Route::FindingDetailPage { .. }, Route::FindingsPage {}) => true,
+                            (Route::GraphIndexPage {}, Route::GraphIndexPage {}) => true,
+                            (Route::GraphExplorerPage { .. }, Route::GraphIndexPage {}) => true,
+                            (Route::ImpactAnalysisPage { .. }, Route::GraphIndexPage {}) => true,
+                            (Route::DastTargetsPage {}, Route::DastOverviewPage {}) => true,
+                            (Route::DastFindingsPage {}, Route::DastOverviewPage {}) => true,
+                            (Route::DastFindingDetailPage { .. }, Route::DastOverviewPage {}) => true,
                             (a, b) => a == b,
                         };
                         let class = if is_active { "nav-item active" } else { "nav-item" };