fix(clipboard): normalize glyph advance by fontSize

Figma expects derivedTextData glyph advance values normalized to
font-size units (advance / fontSize), not absolute pixel values.
This caused pasted text to appear horizontally mirrored because
Figma multiplied the already-absolute advances by fontSize again.

packages/core/src/text/derived-text/clipboard.ts

@@ -72,7 +72,7 @@ export async function buildDerivedTextDataV4(
       },
       fontSize: node.fontSize,
       firstCharacter: shapedGlyph?.firstCharacter ?? index,
-      advance: shapedGlyph?.advance ?? fallbackGlyphAdvance,
+      advance: (shapedGlyph?.advance ?? fallbackGlyphAdvance) / node.fontSize,
       rotation: 0
     }
   })

tests/e2e/panels/basic.spec.ts

@@ -1,6 +1,5 @@
 import { expect, test, useEditorSetup } from '#tests/e2e/fixtures'
 import { expectDefined } from '#tests/helpers/assert'
-import { CanvasHelper } from '#tests/helpers/canvas'
 
 const editor = useEditorSetup()