fix(init): add spinner message for detect-sentry operation

Without this, describeLocalOp falls through to the default branch and
shows the raw operation name "detect-sentry..." to the user.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: betegon

src/lib/init/wizard-runner.ts

@@ -129,6 +129,8 @@ export function describeLocalOp(payload: LocalOpPayload): string {
       return "Listing directory...";
     case "create-sentry-project":
       return `Creating project "${payload.params.name}" (${payload.params.platform})...`;
+    case "detect-sentry":
+      return "Checking for existing Sentry setup...";
     default:
       return `${(payload as { operation: string }).operation}...`;
   }