fix(litegraph): restore link tooltips by resolving data via linkId

- Add linkId to LinkSegment/RenderedLinkSegment
- Set linkId on rendered segments; resolve model link in drawLinkTooltip
- Remove data copy on render objects to keep them ephemeral

src/lib/litegraph/src/LGraphCanvas.ts

@@ -5108,13 +5108,14 @@ export class LGraphCanvas
     }
     ctx.fill()
 
-    // @ts-expect-error TODO: Better value typing
-    const { data } = link
+    // Resolve the underlying model link for data/overrides
+    const modelLink = this.graph?.getLink(
+      (link.linkId ?? (link.id as unknown)) as LinkId
+    )
+    const data = modelLink?.data
+    if (this.onDrawLinkTooltip?.(ctx, modelLink ?? null, this) === true) return
     if (data == null) return
 
-    // @ts-expect-error TODO: Better value typing
-    if (this.onDrawLinkTooltip?.(ctx, link, this) == true) return
-
     let text: string | null = null
 
     if (typeof data === 'number') text = data.toFixed(2)
@@ -5639,7 +5640,8 @@ export class LGraphCanvas
               id: reroute.id,
               origin_id: link.origin_id,
               origin_slot: link.origin_slot,
-              parentId: reroute.parentId
+              parentId: reroute.parentId,
+              linkId: link.id
             })
             rendered.colour = baseColour
             this.renderLink(
@@ -5689,7 +5691,8 @@ export class LGraphCanvas
         id: link.id,
         origin_id: link.origin_id,
         origin_slot: link.origin_slot,
-        parentId: link.parentId
+        parentId: link.parentId,
+        linkId: link.id
       })
       rendered.colour = baseColour
       this.renderLink(
@@ -5711,7 +5714,8 @@ export class LGraphCanvas
         id: link.id,
         origin_id: link.origin_id,
         origin_slot: link.origin_slot,
-        parentId: link.parentId
+        parentId: link.parentId,
+        linkId: link.id
       })
       rendered.colour = baseColour
       this.renderLink(

src/lib/litegraph/src/canvas/RenderedLinkSegment.ts

@@ -12,6 +12,8 @@ export class RenderedLinkSegment implements LinkSegment {
   readonly origin_id: NodeId
   readonly origin_slot: number
   readonly parentId?: RerouteId
+  /** Source link id for resolving runtime data/tooltips. */
+  readonly linkId?: LinkId
 
   path?: Path2D
   readonly _pos: Float32Array = new Float32Array(2)
@@ -24,10 +26,12 @@ export class RenderedLinkSegment implements LinkSegment {
     origin_id: NodeId
     origin_slot: number
     parentId?: RerouteId
+    linkId?: LinkId
   }) {
     this.id = args.id
     this.origin_id = args.origin_id
     this.origin_slot = args.origin_slot
     this.parentId = args.parentId
+    this.linkId = args.linkId
   }
 }

src/lib/litegraph/src/interfaces.ts

@@ -188,6 +188,8 @@ export interface LinkSegment {
   readonly id: LinkId | RerouteId
   /** The {@link id} of the reroute that this segment starts from (output side), otherwise `undefined`.  */
   readonly parentId?: RerouteId
+  /** The source link id (if this segment belongs to a link). */
+  readonly linkId?: LinkId
 
   /** The last canvas 2D path that was used to render this segment */
   path?: Path2D