Add themed SearchBar integration test for macOS

Introduces a new test for SearchBar theming in macOS, including screenshots for normal, hovered, and opened states. Verifies custom theme properties and interaction behaviors.

Author: InesaFitsner

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

@@ -54,3 +54,76 @@ async def handle_tap(e: ft.Event[ft.SearchBar]):
             pixel_ratio=flet_app.screenshots_pixel_ratio
         ),
     )
+
+
+@pytest.mark.asyncio(loop_scope="function")
+async def test_theme(flet_app: ftt.FletTestApp, request):
+    flet_app.page.theme = ft.Theme(
+        search_bar_theme=ft.SearchBarTheme(
+            bgcolor=ft.Colors.SURFACE_CONTAINER_HIGHEST,
+            text_capitalization=ft.TextCapitalization.SENTENCES,
+            shadow_color=ft.Colors.YELLOW,
+            overlay_color=ft.Colors.PURPLE,
+            padding=ft.Padding(10, 20, 50, 20),
+            elevation=100,
+            text_style=ft.TextStyle(color=ft.Colors.RED, italic=True, size=30),
+            hint_style=ft.TextStyle(color=ft.Colors.PINK, size=20, italic=True),
+            shape=ft.RoundedRectangleBorder(
+                radius=ft.BorderRadius.all(50),
+            ),
+            border_side=ft.BorderSide(color=ft.Colors.PURPLE, width=2),
+        )
+    )
+
+    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(
+        "theme",
+        await flet_app.page.take_screenshot(
+            pixel_ratio=flet_app.screenshots_pixel_ratio
+        ),
+    )
+
+    # hover to check overlay color
+    await flet_app.tester.mouse_hover(await flet_app.tester.find_by_key("sb"))
+    await flet_app.tester.pump_and_settle()
+    flet_app.assert_screenshot(
+        "theme_hovered",
+        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(
+        "theme_opened",
+        await flet_app.page.take_screenshot(
+            pixel_ratio=flet_app.screenshots_pixel_ratio
+        ),
+    )