[bugfix] Fix link center dot hit detection when marker is disabled (#5135)

When linkMarkerShape is set to None, clicks were still being detected on the invisible center dot. This fix adds proper checks to skip hit detection when the center marker is disabled.

Fixes center dot hit detection issue

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

src/lib/litegraph/src/LGraphCanvas.ts

@@ -2426,7 +2426,10 @@ export class LGraphCanvas
             pointer.onDragEnd = (e) => this.#processDraggedItems(e)
             return
           }
-        } else if (isInRectangle(x, y, centre[0] - 4, centre[1] - 4, 8, 8)) {
+        } else if (
+          this.linkMarkerShape !== LinkMarkerShape.None &&
+          isInRectangle(x, y, centre[0] - 4, centre[1] - 4, 8, 8)
+        ) {
           this.ctx.lineWidth = lineWidth
 
           pointer.onClick = () => this.showLinkMenu(linkSegment, e)
@@ -4693,6 +4696,11 @@ export class LGraphCanvas
 
   /** @returns If the pointer is over a link centre marker, the link segment it belongs to.  Otherwise, `undefined`.  */
   #getLinkCentreOnPos(e: CanvasPointerEvent): LinkSegment | undefined {
+    // Skip hit detection if center markers are disabled
+    if (this.linkMarkerShape === LinkMarkerShape.None) {
+      return undefined
+    }
+
     for (const linkSegment of this.renderedPaths) {
       const centre = linkSegment._pos
       if (!centre) continue