feat: fail with clear error when browserTarget is used

Author: JohannesHoppe

src/deploy/builder.ts

@@ -16,6 +16,13 @@ import { BuildTarget } from '../interfaces';
 // https://github.com/angular/angularfire/blob/master/src/schematics/deploy/builder.ts
 export default createBuilder(
   async (options: Schema, context: BuilderContext): Promise<BuilderOutput> => {
+    // browserTarget was removed in Angular 19, we require Angular 18+
+    if ((options as Record<string, unknown>).browserTarget) {
+      context.logger.error('❌ The "browserTarget" option is not supported.');
+      context.logger.error('   Use "buildTarget" instead.');
+      return { success: false };
+    }
+
     if (!context.target) {
       throw new Error('Cannot deploy the application without a target');
     }