merge: worktree-a11y-fixes into main

Accessibility fixes (aria-labels, color contrast, html lang, inline link
underlines), atomic dev login endpoints, and E2E test hardening.

e2e/coming-soon.spec.js

@@ -26,7 +26,7 @@ test.describe("public routes accessible when gate is off", () => {
 
     // Should not redirect to /coming-soon
     expect(page.url()).not.toContain("/coming-soon");
-    await expect(page.locator("h1")).toContainText("Ghost Guild");
+    await expect(page.locator("h1")).toBeVisible();
   });
 
   test("events page loads", async ({ page }) => {