feat: Add PathViewer and RiskDriftCard components with templates and styles

- Implemented PathViewerComponent for visualizing reachability call paths.
- Added RiskDriftCardComponent to display reachability drift results.
- Created corresponding HTML templates and SCSS styles for both components.
- Introduced test fixtures for reachability analysis in JSON format.
- Enhanced user interaction with collapsible and expandable features in PathViewer.
- Included risk trend visualization and summary metrics in RiskDriftCard.

src/Scanner/__Libraries/StellaOps.Scanner.VulnSurfaces/Models/VulnSurface.cs

@@ -124,6 +124,12 @@ public sealed record VulnSurfaceSink
     [JsonPropertyName("method_name")]
     public required string MethodName { get; init; }
 
+    /// <summary>
+    /// Namespace/package.
+    /// </summary>
+    [JsonPropertyName("namespace")]
+    public string? Namespace { get; init; }
+
     /// <summary>
     /// Method signature.
     /// </summary>
@@ -153,6 +159,42 @@ public sealed record VulnSurfaceSink
     /// </summary>
     [JsonPropertyName("is_direct_exploit")]
     public bool IsDirectExploit { get; init; }
+
+    /// <summary>
+    /// Whether the method is public.
+    /// </summary>
+    [JsonPropertyName("is_public")]
+    public bool IsPublic { get; init; }
+
+    /// <summary>
+    /// Number of parameters.
+    /// </summary>
+    [JsonPropertyName("parameter_count")]
+    public int? ParameterCount { get; init; }
+
+    /// <summary>
+    /// Return type.
+    /// </summary>
+    [JsonPropertyName("return_type")]
+    public string? ReturnType { get; init; }
+
+    /// <summary>
+    /// Source file path (if available from debug symbols).
+    /// </summary>
+    [JsonPropertyName("source_file")]
+    public string? SourceFile { get; init; }
+
+    /// <summary>
+    /// Start line number.
+    /// </summary>
+    [JsonPropertyName("start_line")]
+    public int? StartLine { get; init; }
+
+    /// <summary>
+    /// End line number.
+    /// </summary>
+    [JsonPropertyName("end_line")]
+    public int? EndLine { get; init; }
 }
 
 /// <summary>