Implement dynamic text scaling layout

The most common failure mode for this widget will be a Column inside a fixed-height container — remove any fixed height constraints from the Column's parent and replace with SingleChildScrollView > Column(mainAxisSize: MainAxisSize.min). For the logo, use Image.asset with a BoxFit.contain inside a ConstrainedBox(constraints: BoxConstraints(maxHeight: 80)) so it shrinks proportionally but never grows to fill available space at large text sizes. For body text, avoid wrapping Text in a SizedBox with a fixed height — let the Text widget self-size. The denial message paragraph may need a flexible container: use Padding rather than SizedBox for spacing between elements.

Test with MediaQuery.textScalerOf override in tests rather than setting device font size, for deterministic results. The 3.2 scale factor maps to the Android 'Largest' font size setting and the iOS 'AX5' Dynamic Type size — these are real user settings and must work correctly per the workshop requirements for users with cognitive and visual accessibility needs.

Write parameterised widget tests using @TestVariants or a loop over textScaleFactors [1.0, 1.5, 2.0, 3.2]. For each scale: (1) wrap the widget with MediaQuery(data: MediaQueryData(textScaler: TextScaler.linear(scale)), child: widget), (2) pump and settle, (3) assert no RenderFlex overflow exceptions via expectLater with throwsA matcher negation, (4) assert that find.byKey(Key('no-access-logout-button')) exists in the widget tree (not clipped). Also run the AccessibilityGuideline checks at scale 3.2 specifically, as this is the most likely failure point.