fix: handle unicode ids in css escape fallback

Author: Aarebecca

__tests__/unit/exporter/svg.test.ts

@@ -245,7 +245,7 @@ describe('exporter/svg', () => {
     expect(exportedRect?.getAttribute('fill')).not.toContain('url(#');
   });
 
-  it.each(['1grad', '-1grad'])(
+  it.each(['1grad', '-1grad', '💡grad'])(
     'inlines defs references for ids requiring CSS.escape fallback (%s)',
     async (gradientId) => {
       const originalCSS = globalThis.CSS;

src/exporter/svg.ts

@@ -561,6 +561,7 @@ function cssEscape(value: string): string {
 
     // Characters that are safe to use unescaped
     if (
+      codeUnit >= 0x0080 ||
       (codeUnit >= 0x0030 && codeUnit <= 0x0039) || // 0-9
       (codeUnit >= 0x0041 && codeUnit <= 0x005a) || // A-Z
       (codeUnit >= 0x0061 && codeUnit <= 0x007a) || // a-z