refactor: move extractPageTitleFromURL to module, add tests

__tests__/url.test.ts

@@ -0,0 +1,28 @@
+import { extractPageTitleFromURL } from '../src/content/utils/url';
+
+describe('extractPageTitleFromURL', () => {
+  it('extracts simple title from URL', () => {
+    const url = 'https://wiki.teamfortress.com/wiki/Scattergun';
+    expect(extractPageTitleFromURL(url)).toBe('Scattergun');
+  });
+
+  it('replaces underscores with spaces', () => {
+    const url = 'https://wiki.teamfortress.com/wiki/Flame_Thrower';
+    expect(extractPageTitleFromURL(url)).toBe('Flame Thrower');
+  });
+
+  it('decodes URI components', () => {
+    const url = 'https://wiki.teamfortress.com/wiki/Dragon%27s_Fury';
+    expect(extractPageTitleFromURL(url)).toBe("Dragon's Fury");
+  });
+
+  it('handles special characters', () => {
+    const url = 'https://wiki.teamfortress.com/wiki/Ze_%C3%9Cbermensch';
+    expect(extractPageTitleFromURL(url)).toBe("Ze Übermensch");
+  });
+
+  it('removes language suffix', () => {
+    const url = 'https://wiki.teamfortress.com/wiki/Ze_%C3%9Cbermensch/pt-br';
+    expect(extractPageTitleFromURL(url)).toBe('Ze Übermensch');
+  });
+});