fix: widget_test.dart is a default counter test and will always fail

[SISIR-REDDY]

Description

The file test/widget_test.dart is the default Flutter counter app test from flutter create. It tests for a counter widget (find.text('0'), find.byIcon(Icons.add)) that does not exist in DocPilot.

This test will always fail because DocPilot is a transcription app, not a counter app. This makes any CI pipeline unreliable.

Current Content

testWidgets('Counter increments smoke test', (WidgetTester tester) async {
  await tester.pumpWidget(const MyApp());
  expect(find.text('0'), findsOneWidget);     // DocPilot has no '0' text
  expect(find.text('1'), findsNothing);
  await tester.tap(find.byIcon(Icons.add));   // DocPilot has no '+' icon
  ...
});

Expected Fix

Replace with a basic smoke test that verifies DocPilot renders its main UI elements (app title, microphone button).