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/traits/graph_builder.rs

@@ -0,0 +1,30 @@
+use std::path::Path;
+
+use crate::error::CoreError;
+use crate::models::graph::{CodeEdge, CodeNode};
+
+/// Output from parsing a single file
+#[derive(Debug, Default)]
+pub struct ParseOutput {
+    pub nodes: Vec<CodeNode>,
+    pub edges: Vec<CodeEdge>,
+}
+
+/// Trait for language-specific code parsers
+#[allow(async_fn_in_trait)]
+pub trait LanguageParser: Send + Sync {
+    /// Language name (e.g., "rust", "python", "javascript")
+    fn language(&self) -> &str;
+
+    /// File extensions this parser handles
+    fn extensions(&self) -> &[&str];
+
+    /// Parse a single file and extract nodes + edges
+    fn parse_file(
+        &self,
+        file_path: &Path,
+        source: &str,
+        repo_id: &str,
+        graph_build_id: &str,
+    ) -> Result<ParseOutput, CoreError>;
+}