fix(i18n): render consent banner inside NextIntl provider

Move ConsentBanner rendering into the locale layout so next-intl context is always available (prevents missing provider errors).

fix(activity-feed): use dark styling for disabled state

Avoid white disabled cards so the feed never appears as a white/transparent block after reload.

test(e2e): assert nav text changes on locale switch

Strengthen i18n test to verify translated labels.

Co-authored-by: dennis <dennis@konkol.net>

e2e/i18n.spec.ts

@@ -7,8 +7,14 @@ test.describe("i18n routing", () => {
     // Buttons are "EN"/"DE" in the header
     const deButton = page.getByRole("button", { name: "DE" });
     if (await deButton.count()) {
+      // Verify an EN label is present before switching (nav.home)
+      await expect(page.getByRole("link", { name: "Home" })).toBeVisible();
+
       await deButton.click();
       await expect(page).toHaveURL(/\/de(\/|$)/);
+
+      // Verify the nav label updates after switching
+      await expect(page.getByRole("link", { name: "Start" })).toBeVisible();
     } else {
       test.skip();
     }