Move "Launching TypeSpec language service..." progress to status bar (#10523)

The VS Code notification for TypeSpec language service startup is not
dismissible, blocking parts of the UI (notably the AI chat panel).

- Changed `ProgressLocation.Notification` to `ProgressLocation.Window`
in the `vscode.window.withProgress` call in `extension.ts`
- The progress indicator now appears in the status bar instead of as a
popup notification, avoiding UI obstruction entirely

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: RodgeFu <6038235+RodgeFu@users.noreply.github.com>

Author: Copilot

.chronus/changes/fix-vscode-notification-dismissible-2026-4-28-4-33-0.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - typespec-vscode
+---
+
+Show "Launching TypeSpec language service..." progress in the status bar instead of as a notification to avoid blocking the UI

packages/typespec-vscode/src/extension.ts

@@ -256,7 +256,7 @@ export async function activate(context: ExtensionContext) {
               return await vscode.window.withProgress(
                 {
                   title: "Launching TypeSpec language service...",
-                  location: vscode.ProgressLocation.Notification,
+                  location: vscode.ProgressLocation.Window,
                 },
                 async () => {
                   return await recreateLSPClient(context, ssTel.activityId);