chore: remove the last references to the deleted marketing site

The desktop packaging spec read apps/site/src/App.vue to check the download
links, which fails now that the site is gone, and an oauth comment pointed
at the same tree.

Author: elkaix

apps/desktop/tests/packaging-config.spec.ts

@@ -73,33 +73,6 @@ describe('desktop packaging configuration', () => {
     })
   })
 
-  it('keeps desktop download URLs derived from their published release version', () => {
-    const siteSource = readFileSync(resolve(repositoryRoot, 'apps/site/src/App.vue'), 'utf8')
-    const desktopVersionMatch = siteSource.match(/const DESKTOP_VERSION = '([^']+)'/)
-
-    expect(desktopVersionMatch).not.toBeNull()
-    expect(desktopVersionMatch![1]).not.toBe('')
-    expect(siteSource).not.toContain('Pythinker-0.1.0-arm64.dmg')
-    expect(siteSource).not.toContain('Pythinker-0.1.0-x64-Setup.exe')
-    expect(siteSource).toContain('Pythinker-${DESKTOP_VERSION}-arm64.dmg')
-    expect(siteSource).toContain('Pythinker-${DESKTOP_VERSION}-x64-Setup.exe')
-    expect(siteSource).toContain('releases/download/v${DESKTOP_VERSION}')
-    expect(siteSource).not.toContain('releases/download/v0.1.0')
-
-    expect(siteSource).toContain('id="desktop"')
-    const macDownload = siteSource.match(
-      /<a[^>]*:href="desktopDownloads\.mac"[^>]*>[\s\S]*?<\/a>/,
-    )
-    expect(macDownload).not.toBeNull()
-    expect(macDownload![0]).toContain('/brand/apple.svg')
-
-    const windowsDownload = siteSource.match(
-      /<a[^>]*:href="desktopDownloads\.windows"[^>]*>[\s\S]*?<\/a>/,
-    )
-    expect(windowsDownload).not.toBeNull()
-    expect(windowsDownload![0]).toContain('/brand/windows11.svg')
-  })
-
   it('maps the staged Host node_modules directory as the copy root', () => {
     expect(desktopPackage.build.extraResources).toEqual(expect.arrayContaining([
       { from: 'resources', to: 'desktop-resources' },

packages/oauth/src/oauth-pages.ts

@@ -50,7 +50,7 @@ const ERROR_BADGE_SVG =
   '<path class="badge-draw" d="M8.5 8.5l7 7M15.5 8.5l-7 7" fill="none" stroke="#dc2626" stroke-width="2" stroke-linecap="round"/>' +
   '</svg>';
 
-// Palette and card treatment mirror apps/site/src/style.css (light canvas,
+// Palette and card treatment mirror the product light theme (light canvas,
 // grid background, hairline card, blue accent). Inline-only: the Inter/mono
 // families fall back to system fonts because this page must work offline.
 const GRID_BG =