feat: improve loading state

Author: dinohamzic

package.json

@@ -2101,7 +2101,8 @@
         "viewsWelcome": [
             {
                 "view": "deepnoteExplorer",
-                "contents": "Welcome to Deepnote for VS Code!\nExplore your data with SQL and Python. Build interactive notebooks, collaborate with your team, and share your insights.\n\n\n\n[$(new-file) New Project](command:deepnote.newProject)\n[$(folder-opened) Import Notebook](command:deepnote.importNotebook)"
+                "contents": "Welcome to Deepnote for VS Code!\nExplore your data with SQL and Python. Build interactive notebooks, collaborate with your team, and share your insights.\n\n\n\n[$(new-file) New Project](command:deepnote.newProject)\n[$(folder-opened) Import Notebook](command:deepnote.importNotebook)",
+                "when": "deepnote.explorerInitialScanComplete"
             }
         ],
         "debuggers": [

src/notebooks/deepnote/deepnoteTreeDataProvider.ts

@@ -8,7 +8,8 @@ import {
     RelativePattern,
     Uri,
     FileSystemWatcher,
-    ThemeIcon
+    ThemeIcon,
+    commands
 } from 'vscode';
 import * as yaml from 'js-yaml';
 
@@ -32,6 +33,7 @@ export class DeepnoteTreeDataProvider implements TreeDataProvider<DeepnoteTreeIt
 
     constructor() {
         this.setupFileWatcher();
+        this.updateContextKey();
     }
 
     public dispose(): void {
@@ -43,6 +45,7 @@ export class DeepnoteTreeDataProvider implements TreeDataProvider<DeepnoteTreeIt
         this.cachedProjects.clear();
         this.isInitialScanComplete = false;
         this.initialScanPromise = undefined;
+        this.updateContextKey();
         this._onDidChangeTreeData.fire();
     }
 
@@ -93,6 +96,7 @@ export class DeepnoteTreeDataProvider implements TreeDataProvider<DeepnoteTreeIt
         } finally {
             this.isInitialScanComplete = true;
             this.initialScanPromise = undefined;
+            this.updateContextKey();
             this._onDidChangeTreeData.fire();
         }
     }
@@ -233,4 +237,8 @@ export class DeepnoteTreeDataProvider implements TreeDataProvider<DeepnoteTreeIt
 
         return undefined;
     }
+
+    private updateContextKey(): void {
+        void commands.executeCommand('setContext', 'deepnote.explorerInitialScanComplete', this.isInitialScanComplete);
+    }
 }