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' },
       });

packages/vscode/src/bridge-system-runtime.ts

@@ -77,10 +77,13 @@ const getOrCreateInstallId = (scope: string): string => {
   return installId;
 };
 
-const mapNodePlatformToApiPlatform = (value: string): 'macos' | 'windows' | 'linux' | 'web' => {
+const mapNodePlatformToApiPlatform = (value: string): 'macos' | 'windows' | 'linux' | 'android' | 'ios' | 'web' => {
+  // The webview already sends API-shaped values; Node's os.platform() is the fallback source.
+  if (value === 'macos' || value === 'windows' || value === 'linux' || value === 'android' || value === 'ios' || value === 'web') {
+    return value;
+  }
   if (value === 'darwin') return 'macos';
   if (value === 'win32') return 'windows';
-  if (value === 'linux') return 'linux';
   return 'web';
 };
 
@@ -315,7 +318,6 @@ export async function handleSystemBridgeMessage(
           : os.arch();
         const reportUsage = body.reportUsage !== false;
 
-        const installId = getOrCreateInstallId('vscode');
         const requestBody = {
           appType: 'vscode',
           deviceClass,
@@ -323,7 +325,7 @@ export async function handleSystemBridgeMessage(
           arch: mapNodeArchToApiArch(archRaw),
           channel: 'stable',
           currentVersion,
-          installId,
+          ...(reportUsage ? { installId: getOrCreateInstallId('vscode') } : {}),
           instanceMode,
           reportUsage,
         };