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This PR introduces a TestWidgetsApp utility class that provides a minimal WidgetsApp wrapper for widget tests, replacing direct usage of Directionality widgets. part of: #177415 ## Changes - test_widgets_app.dart - A reusable TestWidgetsApp widget that wraps WidgetsApp with a builder pattern, providing Directionality, MediaQuery, and other app-level widgets that WidgetsApp provides. - gesture_detector_test.dart - Replaced 9 Directionality usages - mouse_region_test.dart - Replaced 13 Directionality usages - opacity_test.dart - Replaced 2 Directionality usages - slivers_evil_test.dart - Replaced 3 Directionality usages and removed redundant MediaQuery wrappers ## Note - This PR updates golden test baselines for opacity_test.dart. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing.