🏗️ Forge: Style Infrastructure Parity Integration

[tedd]

💡 Hypothesis: The TUI framework lacked standard Style infrastructure and the precise WPF DependencyProperty value precedence (Local > Trigger > Style > Inherited > Default). This prevented declarative UI themes and generated incorrect states when local overrides collided with active triggers or styles.

🎯 Execution:

• Engineered the Style class supporting collections of Setter and TriggerBase.
• Registered StyleProperty as a core dependency property on UIElement.
• Intercepted StyleProperty changes to automatically extract, evaluate, and apply direct style setters.
• Refactored DependencyObject state management to include discrete _styleValues and _styleTriggerValues dictionaries alongside existing local and template trigger values.
• Rewrote GetValue, SetValue, and override tracking mechanics to accurately resolve properties based on strict WPF hierarchical precedence rules.
• Avoided ThreadStatic traps during recursive layout evaluation to ensure deterministic thread safety.

📊 Functional Impact: The framework now fully supports standard WPF-isomorphic style application, visual state modification, and accurate dependency property value resolution, significantly closing the gap for declarative XAML scenarios.

🔬 Verification Protocol:

1. Instantiate a component (e.g. Control).
2. Apply a Style containing a Setter and a Trigger.
3. Verify that the Style setter value correctly reflects in the property getter.
4. Manually set a local override and confirm the local value masks the style value.
5. Mutate the property governed by the Trigger, verify the active trigger supersedes the style setter, and ensure clearing the trigger correctly falls back to either the local override (if set) or the base style setter. All behaviors are validated in StyleTests.cs.

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PR created automatically by Jules for task 18247157550888493731 started by @tedd

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