feat: enhance canvas styling and edge handling with glow effects

- Added custom CSS variables for edge stroke and connection line styles in light and dark modes to improve visual consistency.
- Updated edge rendering logic to utilize new styles, enhancing the appearance of temporary edges during interactions.
- Introduced a new utility function for applying glow effects based on source node types, improving the visual feedback of connections.
- Refactored edge mapping to support glow effects, enhancing user experience during node interactions.

app/globals.css

@@ -145,6 +145,23 @@
 }
 
 @layer components {
+  /* Kanten: doppelte Standard-Dicke, feste Kontrastfarben je Light/Dark (gleiches Schema wie colorMode) */
+  .react-flow {
+    --xy-edge-stroke: rgba(44, 62, 80, 1);
+    --xy-edge-stroke-width: 2;
+    --xy-edge-stroke-selected: rgba(44, 62, 80, 1);
+    --xy-connectionline-stroke: rgba(44, 62, 80, 1);
+    --xy-connectionline-stroke-width: 1;
+  }
+
+  .react-flow.dark {
+    --xy-edge-stroke: rgba(189, 195, 199, 1);
+    --xy-edge-stroke-width: 2;
+    --xy-edge-stroke-selected: rgba(189, 195, 199, 1);
+    --xy-connectionline-stroke: rgba(189, 195, 199, 1);
+    --xy-connectionline-stroke-width: 1;
+  }
+
   /* Verbindungs-Punkte über Node-Inhalt (XYFlow setzt kein z-index) */
   .react-flow__handle {
     z-index: 50;
@@ -156,9 +173,16 @@
   }
 
   .react-flow__edge.temp .react-flow__edge-path {
-    stroke: hsl(var(--foreground) / 0.3);
+    stroke-width: 5;
-    stroke-width: 2.5;
     stroke-dasharray: 8 6;
     stroke-linecap: round;
   }
+
+  .react-flow:not(.dark) .react-flow__edge.temp .react-flow__edge-path {
+    stroke: rgba(44, 62, 80, 0.35);
+  }
+
+  .react-flow.dark .react-flow__edge.temp .react-flow__edge-path {
+    stroke: rgba(189, 195, 199, 0.35);
+  }
 }

components/canvas/canvas.tsx

@@ -34,6 +34,7 @@ import {
   convexNodeDocWithMergedStorageUrl,
   convexNodeToRF,
   convexEdgeToRF,
+  convexEdgeToRFWithSourceGlow,
   NODE_DEFAULTS,
   NODE_HANDLE_MAP,
   resolveMediaAspectRatio,
@@ -133,7 +134,7 @@ const DEFAULT_EDGE_OPTIONS: DefaultEdgeOptions = {
 };
 
 const EDGE_INTERSECTION_HIGHLIGHT_STYLE: NonNullable<RFEdge["style"]> = {
-  stroke: "hsl(var(--foreground))",
+  stroke: "var(--xy-edge-stroke)",
   strokeWidth: 2,
 };
 
@@ -622,10 +623,23 @@ function CanvasInner({ canvasId }: CanvasInnerProps) {
     if (!convexEdges) return;
     setEdges((prev) => {
       const tempEdges = prev.filter((e) => e.className === "temp");
-      const mapped = convexEdges.map(convexEdgeToRF);
+      const sourceTypeByNodeId =
+        convexNodes !== undefined
+          ? new Map(convexNodes.map((n) => [n._id, n.type]))
+          : undefined;
+      const glowMode = resolvedTheme === "dark" ? "dark" : "light";
+      const mapped = convexEdges.map((edge) =>
+        sourceTypeByNodeId
+          ? convexEdgeToRFWithSourceGlow(
+              edge,
+              sourceTypeByNodeId.get(edge.sourceNodeId),
+              glowMode,
+            )
+          : convexEdgeToRF(edge),
+      );
       return [...mapped, ...tempEdges];
     });
-  }, [convexEdges]);
+  }, [convexEdges, convexNodes, resolvedTheme]);
 
   useEffect(() => {
     if (isDragging.current) return;
@@ -1278,6 +1292,7 @@ function CanvasInner({ canvasId }: CanvasInnerProps) {
         <ReactFlow
           nodes={nodes}
           edges={edges}
+          onlyRenderVisibleElements
           defaultEdgeOptions={DEFAULT_EDGE_OPTIONS}
           nodeTypes={nodeTypes}
           onNodesChange={onNodesChange}

lib/canvas-utils.ts

@@ -84,6 +84,54 @@ export function convexEdgeToRF(edge: Doc<"edges">): RFEdge {
   };
 }
 
+/**
+ * Akzentfarben der Handles je Node-Typ (s. jeweilige Node-Komponente).
+ * Für einen dezenten Glow entlang der Kante (drop-shadow am Pfad).
+ */
+const SOURCE_NODE_GLOW_RGB: Record<string, readonly [number, number, number]> = {
+  prompt: [139, 92, 246],
+  "ai-image": [139, 92, 246],
+  image: [13, 148, 136],
+  text: [13, 148, 136],
+  note: [13, 148, 136],
+  asset: [13, 148, 136],
+  group: [100, 116, 139],
+  frame: [249, 115, 22],
+  compare: [100, 116, 139],
+};
+
+export type EdgeGlowColorMode = "light" | "dark";
+
+function sourceGlowFilterForNodeType(
+  type: string | undefined,
+  colorMode: EdgeGlowColorMode,
+): string | undefined {
+  if (!type) return undefined;
+  const rgb = SOURCE_NODE_GLOW_RGB[type];
+  if (!rgb) return undefined;
+  const [r, g, b] = rgb;
+  if (colorMode === "dark") {
+    /* Zwei kleine Schatten statt gestapelter großer Blur — weniger GPU-Last beim Pan/Zoom */
+    return `drop-shadow(0 0 4px rgba(${r},${g},${b},0.72)) drop-shadow(0 0 9px rgba(${r},${g},${b},0.38))`;
+  }
+  return `drop-shadow(0 0 3px rgba(${r},${g},${b},0.42)) drop-shadow(0 0 7px rgba(${r},${g},${b},0.2))`;
+}
+
+/** Wie convexEdgeToRF, setzt zusätzlich filter am Pfad nach Quell-Node-Typ. */
+export function convexEdgeToRFWithSourceGlow(
+  edge: Doc<"edges">,
+  sourceNodeType: string | undefined,
+  colorMode: EdgeGlowColorMode = "light",
+): RFEdge {
+  const base = convexEdgeToRF(edge);
+  const filter = sourceGlowFilterForNodeType(sourceNodeType, colorMode);
+  if (!filter) return base;
+  return {
+    ...base,
+    style: { ...(base.style ?? {}), filter },
+  };
+}
+
 /**
  * Handle-IDs pro Node-Typ für Proximity Connect.
  * `undefined` = default handle (kein explizites `id`-Attribut auf dem Handle).