cleanup: remove useCanvasTransformSync composables. (#5742)

No I am not proud of the new placeholder arguments.

## Summary

Small change to unify the two composables before updating the logic.
Edit: Now unifies them both into the **void**.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5742-cleanup-unify-useCanvasTransformSync-composables-2776d73d36508147ad39d11de8588b2e)
by [Unito](https://www.unito.io)

tests-ui/tests/composables/canvas/useCanvasTransformSync.test.ts

@@ -1,129 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-import { nextTick } from 'vue'
-
-import { useCanvasTransformSync } from '@/composables/canvas/useCanvasTransformSync'
-
-// Mock canvas store
-let mockGetCanvas = vi.fn()
-vi.mock('@/renderer/core/canvas/canvasStore', () => ({
-  useCanvasStore: vi.fn(() => ({
-    getCanvas: mockGetCanvas
-  }))
-}))
-
-describe('useCanvasTransformSync', () => {
-  let mockCanvas: { ds: { scale: number; offset: [number, number] } }
-  let syncFn: ReturnType<typeof vi.fn>
-
-  beforeEach(() => {
-    mockCanvas = {
-      ds: {
-        scale: 1,
-        offset: [0, 0]
-      }
-    }
-    syncFn = vi.fn()
-    mockGetCanvas = vi.fn(() => mockCanvas)
-    vi.clearAllMocks()
-  })
-
-  it('should not call syncFn when transform has not changed', async () => {
-    const { startSync } = useCanvasTransformSync(syncFn, { autoStart: false })
-
-    startSync()
-    await nextTick()
-
-    // Should call once initially
-    expect(syncFn).toHaveBeenCalledTimes(1)
-
-    // Wait for next RAF cycle
-    await new Promise((resolve) => requestAnimationFrame(resolve))
-
-    // Should not call again since transform didn't change
-    expect(syncFn).toHaveBeenCalledTimes(1)
-  })
-
-  it('should call syncFn when scale changes', async () => {
-    const { startSync } = useCanvasTransformSync(syncFn, { autoStart: false })
-
-    startSync()
-    await nextTick()
-
-    expect(syncFn).toHaveBeenCalledTimes(1)
-
-    // Change scale
-    mockCanvas.ds.scale = 2
-
-    // Wait for next RAF cycle
-    await new Promise((resolve) => requestAnimationFrame(resolve))
-
-    expect(syncFn).toHaveBeenCalledTimes(2)
-  })
-
-  it('should call syncFn when offset changes', async () => {
-    const { startSync } = useCanvasTransformSync(syncFn, { autoStart: false })
-
-    startSync()
-    await nextTick()
-
-    expect(syncFn).toHaveBeenCalledTimes(1)
-
-    // Change offset
-    mockCanvas.ds.offset = [10, 20]
-
-    // Wait for next RAF cycles
-    await new Promise((resolve) => requestAnimationFrame(resolve))
-
-    expect(syncFn).toHaveBeenCalledTimes(2)
-  })
-
-  it('should stop calling syncFn after stopSync is called', async () => {
-    const { startSync, stopSync } = useCanvasTransformSync(syncFn, {
-      autoStart: false
-    })
-
-    startSync()
-    await nextTick()
-
-    expect(syncFn).toHaveBeenCalledTimes(1)
-
-    stopSync()
-
-    // Change transform after stopping
-    mockCanvas.ds.scale = 2
-
-    // Wait for RAF cycle
-    await new Promise((resolve) => requestAnimationFrame(resolve))
-
-    // Should not call again
-    expect(syncFn).toHaveBeenCalledTimes(1)
-  })
-
-  it('should handle null canvas gracefully', async () => {
-    mockGetCanvas.mockReturnValue(null)
-    const { startSync } = useCanvasTransformSync(syncFn, { autoStart: false })
-
-    startSync()
-    await nextTick()
-
-    // Should not call syncFn with null canvas
-    expect(syncFn).not.toHaveBeenCalled()
-  })
-
-  it('should call onStart and onStop callbacks', () => {
-    const onStart = vi.fn()
-    const onStop = vi.fn()
-
-    const { startSync, stopSync } = useCanvasTransformSync(syncFn, {
-      autoStart: false,
-      onStart,
-      onStop
-    })
-
-    startSync()
-    expect(onStart).toHaveBeenCalledTimes(1)
-
-    stopSync()
-    expect(onStop).toHaveBeenCalledTimes(1)
-  })
-})