fix(release): point the download centers at the published installer

The download contract on both the web console and the landing site still
advertised 1.2.0, so the install button pointed at
D3RO-Voice-Setup-1.2.0-x64.exe, which the feed answers with 404 while 1.3.7
is live. Wire both contract files into version:sync so the installer version
and release date follow the version SSOT, and set them to the published 1.3.7.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4.1-flash

scripts/ci/sync-version.mjs

@@ -180,6 +180,28 @@ updateText('apps/web/src/components/layout/sidebar.tsx', (text) =>
   ),
 )
 
+// Download centers build the installer filename from these constants. They drifted
+// to 1.2.0 while the feed served newer versions, so the download button pointed at
+// an installer that does not exist. Keep both surfaces on the version SSOT.
+for (const releaseContractPath of [
+  'apps/web/src/lib/desktop-release.ts',
+  'site/src/release.ts',
+]) {
+  updateText(releaseContractPath, (text) =>
+    replaceExactlyOnce(
+      replaceExactlyOnce(
+        text,
+        /export const DESKTOP_VERSION = '[^']+'/,
+        `export const DESKTOP_VERSION = '${metadata.version}'`,
+        `${releaseContractPath} desktop version`,
+      ),
+      /export const DESKTOP_RELEASE_DATE = '[^']+'/,
+      `export const DESKTOP_RELEASE_DATE = '${metadata.releaseDate}'`,
+      `${releaseContractPath} desktop release date`,
+    ),
+  )
+}
+
 const changelog = readFileSync(join(root, 'CHANGELOG.md'), 'utf8')
 if (!new RegExp(`^## \\[${escapeRegExp(metadata.version)}\\] - ${metadata.releaseDate}$`, 'm').test(changelog)) {
   fail(`CHANGELOG.md is missing [${metadata.version}] - ${metadata.releaseDate}.`)