feat: add accessibility smoke test script

tests/a11y_audit.js

@@ -0,0 +1,51 @@
+/**
+ * Accessibility Smoke Test for The Beacon
+ * This script can be run in the browser console or via a headless test runner.
+ * It verifies that key interactive elements have the required ARIA attributes.
+ */
+
+function runA11yAudit() {
+    console.log("--- The Beacon: Accessibility Audit ---");
+    let errors = 0;
+
+    // 1. Check progress bars
+    const progressBars = document.querySelectorAll('[role="progressbar"]');
+    if (progressBars.length === 0) {
+        console.error("[FAIL] No progress bars found with role='progressbar'");
+        errors++;
+    } else {
+        progressBars.forEach(bar => {
+            if (!bar.hasAttribute('aria-valuenow')) {
+                console.error("[FAIL] Progress bar missing aria-valuenow", bar);
+                errors++;
+            }
+        });
+    }
+
+    // 2. Check buy buttons
+    const buyButtons = document.querySelectorAll('.build-btn:not([aria-disabled="true"])');
+    buyButtons.forEach(btn => {
+        if (!btn.hasAttribute('aria-label')) {
+            console.error("[FAIL] Active buy button missing aria-label", btn);
+            errors++;
+        }
+    });
+
+    // 3. Check buy amount toggles
+    const toggles = document.querySelectorAll('button[onclick^="setBuyAmount"]');
+    toggles.forEach(btn => {
+        if (!btn.hasAttribute('aria-pressed')) {
+            console.error("[FAIL] Buy amount toggle missing aria-pressed", btn);
+            errors++;
+        }
+    });
+
+    if (errors === 0) {
+        console.log("PASSED: All checked elements have required ARIA attributes.");
+    } else {
+        console.error(`FAILED: Found ${errors} accessibility issues.`);
+    }
+}
+
+// Export for use in other scripts if needed
+if (typeof module !== 'undefined') module.exports = { runA11yAudit };