fix(links): update GitHub repository URLs to markpdfdown-desktop (#15)

Update all GitHub repository URLs from the old 'desktop' slug to the
new 'markpdfdown-desktop' slug across the application. This includes
links in the About dialog, footer, and corresponding test assertions.

- Update website, license, and feedback links in About component
- Update footer GitHub link in Layout component
- Update test expectations to match new URLs

Author: jorben

src/renderer/components/About.tsx

@@ -49,13 +49,13 @@ const About: React.FC = () => {
           {t('about.subtitle')}
         </Text>
         <Space style={{ marginTop: 16 }}>
-          <Button onClick={() => handleOpenLink('https://github.com/MarkPDFdown')}>
+          <Button onClick={() => handleOpenLink('https://github.com/MarkPDFdown/markpdfdown-desktop')}>
             {t('about.buttons.website')}
           </Button>
-          <Button onClick={() => handleOpenLink('https://github.com/MarkPDFdown/desktop/blob/master/LICENSE')}>
+          <Button onClick={() => handleOpenLink('https://github.com/MarkPDFdown/markpdfdown-desktop/blob/master/LICENSE')}>
             {t('about.buttons.license')}
           </Button>
-          <Button onClick={() => handleOpenLink('https://github.com/MarkPDFdown/desktop/issues')}>
+          <Button onClick={() => handleOpenLink('https://github.com/MarkPDFdown/markpdfdown-desktop/issues')}>
             {t('about.buttons.feedback')}
           </Button>
           <Button onClick={() => handleOpenLink('mailto:jorben@aix.me')}>

src/renderer/components/Layout.tsx

@@ -290,7 +290,7 @@ const AppLayout: React.FC = () => {
             padding: '16px 0'
           }}>
             <div
-              onClick={() => openExternalLink('https://github.com/MarkPDFdown/desktop')}
+              onClick={() => openExternalLink('https://github.com/MarkPDFdown/markpdfdown-desktop')}
               style={{ 
                 color: 'rgba(255, 255, 255, 0.65)', 
                 fontSize: '20px', 

src/renderer/components/__tests__/About.test.tsx

@@ -120,7 +120,7 @@ describe('About', () => {
       const websiteButton = screen.getByText('Website')
       fireEvent.click(websiteButton)
 
-      expect(mockWindowOpen).toHaveBeenCalledWith('https://github.com/MarkPDFdown', '_blank')
+      expect(mockWindowOpen).toHaveBeenCalledWith('https://github.com/MarkPDFdown/markpdfdown-desktop', '_blank')
     })
 
     it('should open license link when License button is clicked', () => {
@@ -134,7 +134,7 @@ describe('About', () => {
       fireEvent.click(licenseButton)
 
       expect(mockWindowOpen).toHaveBeenCalledWith(
-        'https://github.com/MarkPDFdown/desktop/blob/master/LICENSE',
+        'https://github.com/MarkPDFdown/markpdfdown-desktop/blob/master/LICENSE',
         '_blank'
       )
     })
@@ -150,7 +150,7 @@ describe('About', () => {
       fireEvent.click(feedbackButton)
 
       expect(mockWindowOpen).toHaveBeenCalledWith(
-        'https://github.com/MarkPDFdown/desktop/issues',
+        'https://github.com/MarkPDFdown/markpdfdown-desktop/issues',
         '_blank'
       )
     })