Add integration test for SearchBar on macOS

Introduces a new integration test for the SearchBar control, including golden images for its basic and opened states on macOS. The test verifies SearchBar rendering and interaction, ensuring correct UI behavior.

Author: InesaFitsner

sdk/python/packages/flet/integration_tests/controls/golden/macos/search_bar/basic.png

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+import pytest
+import pytest_asyncio
+
+import flet as ft
+import flet.testing as ftt
+
+
+@pytest_asyncio.fixture(scope="function", autouse=True)
+def flet_app(flet_app_function):
+    return flet_app_function
+
+
+@pytest.mark.asyncio(loop_scope="function")
+async def test_basic(flet_app: ftt.FletTestApp, request):
+    async def handle_tile_click(e: ft.Event[ft.ListTile]):
+        await sb.close_view(e.control.title.value)
+
+    async def handle_tap(e: ft.Event[ft.SearchBar]):
+        print("handle_tap")
+        await sb.open_view()
+
+    sb = ft.SearchBar(
+        key="sb",
+        bar_hint_text="Search colors...",
+        view_hint_text="Choose a color from the suggestions...",
+        on_tap=handle_tap,
+        controls=[
+            ft.ListTile(title=ft.Text(f"Color {i}"), on_click=handle_tile_click)
+            for i in range(10)
+        ],
+    )
+
+    flet_app.page.enable_screenshots = True
+    flet_app.page.window.width = 400
+    flet_app.page.window.height = 600
+    flet_app.page.controls = [sb]
+    flet_app.page.update()
+    await flet_app.tester.pump_and_settle()
+
+    # normal state
+    flet_app.assert_screenshot(
+        "basic",
+        await flet_app.page.take_screenshot(
+            pixel_ratio=flet_app.screenshots_pixel_ratio
+        ),
+    )
+
+    # open state
+    await flet_app.tester.tap(await flet_app.tester.find_by_key("sb"))
+    await flet_app.tester.pump_and_settle()
+    flet_app.assert_screenshot(
+        "basic_opened",
+        await flet_app.page.take_screenshot(
+            pixel_ratio=flet_app.screenshots_pixel_ratio
+        ),
+    )