fix(telemetry): report real VS Code platform and honor usage opt-out

The VS Code bridge re-mapped the already-mapped platform value from the
webview, collapsing every install to platform "web"; it also sent the
installId even when usage reporting was disabled. The remote-instance
update poll in the header and the post-update wait poll now send
reportUsage=false so status checks no longer count as activity.

packages/ui/src/components/layout/Header.tsx

@@ -950,7 +950,8 @@ export const Header: React.FC<HeaderProps> = ({
     setRemoteUpdateChecking(true);
     setRemoteUpdateError(null);
     try {
-      const params = new URLSearchParams({ appType: 'web', instanceMode: 'remote' });
+      // Status-only poll: must not count as usage on the remote server's install id.
+      const params = new URLSearchParams({ appType: 'web', instanceMode: 'remote', reportUsage: 'false' });
       const response = await runtimeFetch(`/api/openchamber/update-check?${params.toString()}`, {
         method: 'GET',
         headers: { Accept: 'application/json' },

packages/ui/src/components/ui/UpdateDialog.tsx

@@ -161,7 +161,8 @@ async function waitForUpdateApplied(
 ): Promise<boolean> {
   for (let i = 0; i < maxAttempts; i++) {
     try {
-      const response = await runtimeFetch('/api/openchamber/update-check', {
+      // Status-only poll while waiting for the update to apply; not a usage report.
+      const response = await runtimeFetch('/api/openchamber/update-check?reportUsage=false', {
         method: 'GET',
         headers: { Accept: 'application/json' },
       });