Integrate MSE installer into CLI prompt flow

Summary:
Wire the MSE auto-installer into the CLI prompt flow and output messaging.

Changes in prompts.ts:
- Call `installMSE()` when user selects "Yes" for Meta Spatial Editor integration
- Only show manual installation prerequisite if auto-install fails or is declined

Changes in cli.ts:
- Show contextual messaging based on installation result:
  - "Meta Spatial Editor is ready!" if successfully installed or already present
  - "After installing Meta Spatial Editor..." if manual installation needed
- Display project paths for opening in Meta Spatial Editor

This completes the MSE auto-install feature (part 4 of 4).

Reviewed By: wangpingsx

Differential Revision: D91470649

fbshipit-source-id: bf3d515a5b408187182a773dd05674827ddc3a01

Author: ycliu613

packages/create/src/cli.ts

@@ -175,13 +175,24 @@ IWSDK Create CLI v${VERSION}\nNode ${process.version}`;
     if (res.metaspatial) {
       const metaProjectPath = join(outDir, 'metaspatial');
       const metaMainPath = join(metaProjectPath, 'Main.metaspatial');
-      prereqs.push({
-        level: 'important',
-        message:
-          `Open the Meta Spatial Editor project.\n` +
-          `Project Folder: ${metaProjectPath}\n` +
-          `Open in Meta Spatial Editor: ${metaMainPath}`,
-      });
+
+      if (res.mseInstallResult?.installed && !res.mseInstallResult.manual) {
+        prereqs.push({
+          level: 'info',
+          message:
+            `Meta Spatial Editor is ready!\n` +
+            `Project Folder: ${metaProjectPath}\n` +
+            `Open in Meta Spatial Editor: ${metaMainPath}`,
+        });
+      } else {
+        prereqs.push({
+          level: 'important',
+          message:
+            `After installing Meta Spatial Editor, open the project:\n` +
+            `Project Folder: ${metaProjectPath}\n` +
+            `Open in Meta Spatial Editor: ${metaMainPath}`,
+        });
+      }
     }
     // Print prerequisites first, then next steps
     printPrerequisites(prereqs);

packages/create/src/prompts.ts

@@ -6,7 +6,8 @@
  */
 
 import prompts from 'prompts';
-import { PromptResult, TriState, VariantId } from './types.js';
+import { installMSE } from './mse-installer.js';
+import { MSEInstallResult, PromptResult, TriState, VariantId } from './types.js';
 
 export async function promptFlow(nameArg?: string): Promise<PromptResult> {
   let cancelled = false;
@@ -242,24 +243,30 @@ export async function promptFlow(nameArg?: string): Promise<PromptResult> {
       name: 'metaspatialChoice',
       message: 'Enable Meta Spatial Editor integration?',
       choices: [
-        { title: 'No (Can change later)', value: false },
         {
-          title: 'Yes (Additional software required)',
+          title: 'Yes (Install Meta Spatial Editor if needed)',
           value: true,
         },
+        { title: 'No (Can change later)', value: false },
       ],
       initial: 0,
     },
     { onCancel },
   );
   const metaspatial = !!metaAnswer.metaspatialChoice;
 
+  let mseInstallResult: MSEInstallResult | undefined;
+
   if (metaspatial) {
-    prerequisites.push({
-      level: 'important',
-      message:
-        'Required: Install Meta Spatial Editor (v9 or later). The build pipeline depends on its CLI tool; without it, build or dev WILL FAIL. Download: https://developers.meta.com/horizon/documentation/spatial-sdk/spatial-editor-overview',
-    });
+    mseInstallResult = await installMSE();
+
+    if (mseInstallResult.manual || mseInstallResult.outdated) {
+      prerequisites.push({
+        level: 'important',
+        message:
+          'Required: Install Meta Spatial Editor (v9 or later). The build pipeline depends on its CLI tool; without it, build or dev WILL FAIL. Download: https://developers.meta.com/horizon/documentation/spatial-sdk/spatial-editor-overview',
+      });
+    }
   }
 
   const { gitInit, installNow } = await prompts(
@@ -307,5 +314,6 @@ export async function promptFlow(nameArg?: string): Promise<PromptResult> {
     xrFeatureStates,
     actionItems,
     prerequisites,
+    mseInstallResult,
   };
 }