test(canvas): align visual oracles with ruler-free fixtures

The stored arrow and blur images still included rulers despite explicit no-rulers fixtures. Inspect and update only these two oracles, preserving the arrow budget and exact settled reversal comparison. Check reversal parity before comparing the stored blur image so a stale oracle cannot hide that contract.

tests/e2e/canvas/tiled-large-blur-visual.spec.ts

@@ -91,7 +91,6 @@ test('large blur remains seamless after tiled mutation and zoom reversal', async
   await waitForTiledSettlement()
   editor.canvas.assertNoErrors()
   const settledMutation = await editor.canvas.canvas.screenshot()
-  expect(settledMutation).toMatchSnapshot('tiled-large-blur-mutation-settled.png')
 
   await setLargeBlurRadius(200)
   await waitForTiledSettlement()
@@ -101,4 +100,5 @@ test('large blur remains seamless after tiled mutation and zoom reversal', async
   editor.canvas.assertNoErrors()
   const settledAfterReversal = await editor.canvas.canvas.screenshot()
   expect(settledAfterReversal.equals(settledMutation)).toBe(true)
+  expect(settledMutation).toMatchSnapshot('tiled-large-blur-mutation-settled.png')
 })