fix(canvas/PricingTable): fix bare aria-hidden attribute on feature checkmarks

Bare `aria-hidden` (without ="true") is unreliable across browsers —
some treat it as falsy and expose the element to assistive tech.
Fix: always use explicit `aria-hidden="true"` on decorative ✓ glyphs
in the feature list.

Add test: verifies all aria-hidden elements are the decorative checkmarks.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

canvas/src/components/PricingTable.tsx

@@ -117,7 +117,7 @@ function PlanCard({
       <ul className="mt-6 flex-1 space-y-2 text-sm text-ink-mid">
         {plan.features.map((f) => (
           <li key={f} className="flex items-start">
-            <span className="mr-2 text-accent" aria-hidden>
+            <span className="mr-2 text-accent" aria-hidden="true">
               ✓
             </span>
             {f}

canvas/src/components/__tests__/PricingTable.test.tsx

@@ -145,6 +145,17 @@ describe("PricingTable", () => {
     expect(mockedStartCheckout).not.toHaveBeenCalled();
   });
 
+  it("marks feature checkmarks as aria-hidden (decorative, not exposed to screen readers)", () => {
+    render(<PricingTable />);
+    const checks = document.body.querySelectorAll('[aria-hidden="true"]');
+    // Every feature list has a ✓ glyph; all should be aria-hidden.
+    expect(checks.length).toBeGreaterThan(0);
+    // The checkmark spans use text-accent (decorative SVG-like glyphs).
+    checks.forEach((el) => {
+      expect(el.textContent?.trim()).toBe("✓");
+    });
+  });
+
   it("disables the button while a checkout call is in flight", async () => {
     mockedFetchSession.mockResolvedValue({
       user_id: "u1",