feat: add rendering-primitives crate, share non_import_rels across renderers

crates/adapters/html-viewer/Cargo.toml

@@ -6,6 +6,7 @@ publish = false
 
 [dependencies]
 archlens-domain.workspace = true
+archlens-rendering-primitives.workspace = true
 serde.workspace = true
 serde_json = "1"
 

crates/adapters/html-viewer/src/html_renderer.rs

@@ -3,8 +3,9 @@ use std::collections::HashMap;
 use serde::Serialize;
 
 use archlens_domain::{
-    CodeGraph, DomainError, RelationshipKind, RenderOutput, RenderedFile, ports::DiagramRenderer,
+    CodeGraph, DomainError, RenderOutput, RenderedFile, ports::DiagramRenderer,
 };
+use archlens_rendering_primitives::non_import_rels;
 
 pub struct HtmlRenderer;
 
@@ -66,10 +67,7 @@ impl DiagramRenderer for HtmlRenderer {
             });
         }
 
-        let edges = graph
-            .relationships()
-            .iter()
-            .filter(|r| r.kind() != RelationshipKind::Import)
+        let edges = non_import_rels(graph.relationships())
             .filter_map(|r| {
                 let src = id_map.get(r.source())?;
                 let tgt = id_map.get(r.target())?;