fix(smus): reload project node after re-authorization (#8376)

## Problem
- Project node is not loading automatically after re-authentication

## Solution
- After re-authentication, set the project, then refresh the node

## User experience
- the user will see select project popup after re-authentication 

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Co-authored-by: Build User <[email protected]>

Author: kzr-at-amazon

packages/core/src/sagemakerunifiedstudio/explorer/activation.ts

@@ -113,6 +113,13 @@ export async function activate(extensionContext: vscode.ExtensionContext): Promi
             if (connection) {
                 try {
                     await smusAuthProvider.reauthenticate(connection)
+                    const projectNode = smusRootNode.getProjectSelectNode()
+                    if (projectNode) {
+                        const project = projectNode.getProject()
+                        if (!project) {
+                            await vscode.commands.executeCommand('aws.smus.switchProject')
+                        }
+                    }
                     treeDataProvider.refresh()
 
                     // IAM connections handle their own success messages

packages/core/src/test/sagemakerunifiedstudio/explorer/activation.test.ts

@@ -27,8 +27,10 @@ describe('SMUS Explorer Activation', function () {
     let mockTreeView: sinon.SinonStubbedInstance<vscode.TreeView<any>>
     let mockTreeDataProvider: sinon.SinonStubbedInstance<ResourceTreeDataProvider>
     let mockSmusRootNode: sinon.SinonStubbedInstance<SageMakerUnifiedStudioRootNode>
+    let mockProjectNode: any
     let createTreeViewStub: sinon.SinonStub
     let registerCommandStub: sinon.SinonStub
+    let executeCommandSpy: sinon.SinonSpy
     let dataZoneDisposeStub: sinon.SinonStub
     let setupUserActivityMonitoringStub: sinon.SinonStub
 
@@ -59,14 +61,20 @@ describe('SMUS Explorer Activation', function () {
             refresh: sinon.stub(),
         } as any
 
+        mockProjectNode = {
+            getProject: sinon.stub().returns({ id: 'test-project', name: 'Test Project' }),
+            refreshNode: sinon.stub().resolves(),
+        }
+
         mockSmusRootNode = {
             getChildren: sinon.stub().resolves([]),
-            getProjectSelectNode: sinon.stub().returns({ refreshNode: sinon.stub().resolves() }),
+            getProjectSelectNode: sinon.stub().returns(mockProjectNode),
         } as any
 
         // Stub vscode APIs
         createTreeViewStub = sinon.stub(vscode.window, 'createTreeView').returns(mockTreeView as any)
         registerCommandStub = sinon.stub(vscode.commands, 'registerCommand').returns({ dispose: sinon.stub() } as any)
+        executeCommandSpy = sinon.spy(vscode.commands, 'executeCommand')
 
         // Stub SmusAuthenticationProvider
         sinon.stub(SmusAuthenticationProvider, 'fromContext').returns(mockSmusAuthProvider as any)
@@ -214,6 +222,9 @@ describe('SMUS Explorer Activation', function () {
                 await reauthCommand.args[1](mockConnection)
 
                 assert.ok(mockSmusAuthProvider.reauthenticate.calledWith(mockConnection))
+                assert.ok(mockSmusRootNode.getProjectSelectNode.called)
+                assert.ok((mockProjectNode.getProject as sinon.SinonStub).called)
+                assert.ok(executeCommandSpy.neverCalledWith('aws.smus.switchProject'))
                 assert.ok(mockTreeDataProvider.refresh.called)
 
                 // Check that an information message was shown