feat: enhance theme handling and layout components for Telegram Mini App

- Updated theme resolution logic to utilize a shared inline script for consistent theme application across routes.
- Introduced `AppShell` and `ReadyGate` components to manage app readiness and theme synchronization, improving user experience.
- Enhanced `GlobalError` and `NotFound` pages with a unified full-screen layout for better accessibility and visual consistency.
- Refactored CSS to implement safe area insets for sticky headers and content safety, ensuring proper layout on various devices.
- Added unit tests for new functionality and improved existing tests for better coverage and reliability.

webapp-next/src/components/contact/ContactLinks.test.tsx

@@ -9,11 +9,15 @@ import { ContactLinks } from "./ContactLinks";
 import { resetAppStore } from "@/test/test-utils";
 
 const openPhoneLinkMock = vi.fn();
+const openTelegramProfileMock = vi.fn();
 const triggerHapticLightMock = vi.fn();
 
 vi.mock("@/lib/open-phone-link", () => ({
   openPhoneLink: (...args: unknown[]) => openPhoneLinkMock(...args),
 }));
+vi.mock("@/lib/telegram-link", () => ({
+  openTelegramProfile: (...args: unknown[]) => openTelegramProfileMock(...args),
+}));
 vi.mock("@/lib/telegram-haptic", () => ({
   triggerHapticLight: () => triggerHapticLightMock(),
 }));
@@ -22,6 +26,7 @@ describe("ContactLinks", () => {
   beforeEach(() => {
     resetAppStore();
     openPhoneLinkMock.mockClear();
+    openTelegramProfileMock.mockClear();
     triggerHapticLightMock.mockClear();
   });
 
@@ -82,4 +87,17 @@ describe("ContactLinks", () => {
     expect(openPhoneLinkMock).toHaveBeenCalledWith("+79991234567");
     expect(triggerHapticLightMock).toHaveBeenCalled();
   });
+
+  it("calls openTelegramProfile and triggerHapticLight when Telegram link is clicked", () => {
+    render(
+      <ContactLinks phone={null} username="alice_dev" showLabels={false} />
+    );
+    const tgLink = document.querySelector<HTMLAnchorElement>('a[href*="t.me"]');
+    expect(tgLink).toBeInTheDocument();
+
+    fireEvent.click(tgLink!);
+
+    expect(openTelegramProfileMock).toHaveBeenCalledWith("alice_dev");
+    expect(triggerHapticLightMock).toHaveBeenCalled();
+  });
 });