feat(tests): add comprehensive telemetry and interface tests

- Introduced new test files for telemetry functionality, including integration, fuzzing, and extended tests to ensure robustness and performance.
- Added tests for parsing LXMF display names and telemetry data, addressing potential bugs and ensuring correct handling of various input formats.
- Implemented performance tests for the InterfacesPage component, validating rendering efficiency with a large number of discovered interfaces.
- Enhanced existing tests for markdown rendering and link utilities to cover additional edge cases and improve stability.

tests/frontend/LanguageSelector.test.js

@@ -43,10 +43,11 @@ describe("LanguageSelector.vue", () => {
         await wrapper.find("button").trigger("click");
 
         const languageButtons = wrapper.findAll(".fixed button");
-        expect(languageButtons).toHaveLength(3);
+        expect(languageButtons).toHaveLength(4);
         expect(languageButtons[0].text()).toContain("English");
         expect(languageButtons[1].text()).toContain("Deutsch");
         expect(languageButtons[2].text()).toContain("Русский");
+        expect(languageButtons[3].text()).toContain("Italiano");
     });
 
     it("emits language-change when a different language is selected", async () => {