feat(canvas): match hover outline to selection style for components and instances

hover outlines now use purple solid for reusable components and #9281f7
dashed for instances, consistent with their selection border styling

src/canvas/use-canvas-hover.ts

@@ -1,12 +1,29 @@
 import { useEffect } from 'react'
 import { useCanvasStore } from '@/stores/canvas-store'
+import { useDocumentStore } from '@/stores/document-store'
 import type { FabricObjectWithPenId } from './canvas-object-factory'
 import { resolveTargetAtDepth, getChildIds } from './selection-context'
+import { COMPONENT_COLOR, INSTANCE_COLOR } from './canvas-constants'
+import type { PenNode } from '@/types/pen'
 
 const HOVER_COLOR = '#3b82f6'
 const HOVER_LINE_WIDTH = 1.5
 const CHILD_DASH = [4, 4]
 
+function collectReusableIds(nodes: PenNode[], result: Set<string>) {
+  for (const node of nodes) {
+    if ('reusable' in node && node.reusable === true) result.add(node.id)
+    if ('children' in node && node.children) collectReusableIds(node.children, result)
+  }
+}
+
+function collectInstanceIds(nodes: PenNode[], result: Set<string>) {
+  for (const node of nodes) {
+    if (node.type === 'ref') result.add(node.id)
+    if ('children' in node && node.children) collectInstanceIds(node.children, result)
+  }
+}
+
 export function useCanvasHover() {
   useEffect(() => {
     const interval = setInterval(() => {
@@ -66,6 +83,12 @@ export function useCanvasHover() {
         const zoom = vpt[0]
         const dpr = el.width / el.offsetWidth
 
+        const docChildren = useDocumentStore.getState().document.children
+        const reusableIds = new Set<string>()
+        const instanceIds = new Set<string>()
+        collectReusableIds(docChildren, reusableIds)
+        collectInstanceIds(docChildren, instanceIds)
+
         ctx.save()
         ctx.setTransform(
           vpt[0] * dpr, vpt[1] * dpr,
@@ -76,13 +99,13 @@ export function useCanvasHover() {
         // Solid outline on hovered target — skip if already selected
         // (Fabric draws its own selection handles)
         if (!isSelected) {
-          drawNodeOutline(ctx, hoveredId, false, zoom)
+          drawNodeOutline(ctx, hoveredId, false, zoom, reusableIds, instanceIds)
         }
 
         // Dashed outlines on direct children — always draw on hover
         const childIds = getChildIds(hoveredId)
         for (const childId of childIds) {
-          drawNodeOutline(ctx, childId, true, zoom)
+          drawNodeOutline(ctx, childId, true, zoom, reusableIds, instanceIds)
         }
 
         ctx.restore()
@@ -93,6 +116,8 @@ export function useCanvasHover() {
         nodeId: string,
         dashed: boolean,
         zoom: number,
+        reusableIds: Set<string>,
+        instanceIds: Set<string>,
       ) {
         const objects = canvas!.getObjects() as FabricObjectWithPenId[]
         const obj = objects.find((o) => o.penNodeId === nodeId)
@@ -104,6 +129,9 @@ export function useCanvasHover() {
         const h = (obj.height ?? 0) * (obj.scaleY ?? 1)
         const angle = obj.angle ?? 0
 
+        const isReusable = reusableIds.has(nodeId)
+        const isInstance = instanceIds.has(nodeId)
+
         ctx.save()
 
         if (angle !== 0) {
@@ -114,9 +142,15 @@ export function useCanvasHover() {
           ctx.translate(-cx, -cy)
         }
 
-        ctx.strokeStyle = HOVER_COLOR
+        ctx.strokeStyle = isReusable
+          ? COMPONENT_COLOR
+          : isInstance
+            ? INSTANCE_COLOR
+            : HOVER_COLOR
         ctx.lineWidth = HOVER_LINE_WIDTH / zoom
-        if (dashed) {
+        if (isInstance) {
+          ctx.setLineDash(CHILD_DASH.map((d) => d / zoom))
+        } else if (dashed) {
           ctx.setLineDash(CHILD_DASH.map((d) => d / zoom))
         } else {
           ctx.setLineDash([])