feat: enhance CI workflow and update webapp styles

- Added Node.js setup and webapp testing steps to the CI workflow for improved integration.
- Updated HTML to link multiple CSS files for better modularity and organization of styles.
- Removed deprecated `style.css` and introduced new CSS files for base styles, calendar, day detail, hints, markers, states, and duty list to enhance maintainability and readability.
- Implemented new styles for improved presentation of duty information and user interactions.
- Added unit tests for new API functions and contact link rendering to ensure functionality and reliability.

webapp/js/auth.test.js

@@ -7,6 +7,7 @@ import {
   getTgWebAppDataFromHash,
   getInitData,
   isLocalhost,
+  hasTelegramHashButNoInitData,
 } from "./auth.js";
 
 describe("getTgWebAppDataFromHash", () => {
@@ -98,3 +99,57 @@ describe("isLocalhost", () => {
     expect(isLocalhost()).toBe(false);
   });
 });
+
+describe("hasTelegramHashButNoInitData", () => {
+  const origLocation = window.location;
+
+  afterEach(() => {
+    window.location = origLocation;
+  });
+
+  it("returns false when hash is empty", () => {
+    delete window.location;
+    window.location = { ...origLocation, hash: "", search: "" };
+    expect(hasTelegramHashButNoInitData()).toBe(false);
+  });
+
+  it("returns true when hash has tgWebAppVersion but no tgWebAppData", () => {
+    delete window.location;
+    window.location = {
+      ...origLocation,
+      hash: "#tgWebAppVersion=6",
+      search: "",
+    };
+    expect(hasTelegramHashButNoInitData()).toBe(true);
+  });
+
+  it("returns false when hash has both tgWebAppVersion and tgWebAppData", () => {
+    delete window.location;
+    window.location = {
+      ...origLocation,
+      hash: "#tgWebAppVersion=6&tgWebAppData=some%3Ddata",
+      search: "",
+    };
+    expect(hasTelegramHashButNoInitData()).toBe(false);
+  });
+
+  it("returns false when hash has tgWebAppData in unencoded form (with & and =)", () => {
+    delete window.location;
+    window.location = {
+      ...origLocation,
+      hash: "#tgWebAppData=value&tgWebAppVersion=6",
+      search: "",
+    };
+    expect(hasTelegramHashButNoInitData()).toBe(false);
+  });
+
+  it("returns false when hash has no Telegram params", () => {
+    delete window.location;
+    window.location = {
+      ...origLocation,
+      hash: "#other=param",
+      search: "",
+    };
+    expect(hasTelegramHashButNoInitData()).toBe(false);
+  });
+});