chore: fix TS alias resolution and SVG mocking for test setup

vitest.setup.jsdom.ts

@@ -17,7 +17,7 @@ Element.prototype.animate = vi.fn().mockReturnValue({
 });
 
 // jsdom lacks SVG geometry methods
-SVGElement.prototype.getTotalLength = vi.fn(() => 0);
+(SVGElement.prototype as any).getTotalLength = vi.fn(() => 0);
 
 // Robust localStorage mock for jsdom environment
 const localStorageMock = (() => {