feat: Require Dart 3.9

[kevmoo]

Reformat code

[kevmoo]

This will land after #616 - that PR does the workspace bits. This is JUST formatting. Keeping things clean

[gemini-code-assist]

Summary of Changes

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This pull request significantly updates the project's foundational dependencies by upgrading the Dart SDK requirements and modernizing the linting setup. It streamlines configuration management and introduces various code style and safety improvements, ensuring better maintainability and adherence to current Dart best practices.

Highlights

• Dart SDK Upgrade: The minimum Dart SDK requirement for all packages has been upgraded to Dart 3.5, and the required Dart version has been set to 3.9.0.
• Linting Configuration Consolidation: Individual analysis_options.yaml files within packages and examples have been removed, consolidating linting rules into a single root analysis_options.yaml file. The flutter_lints package has also been updated to version ^6.0.0.
• Code Conciseness and Robustness Improvements: Numerous code refactorings have been applied across the codebase to improve conciseness, particularly in constructor calls, widget instantiations, and callback definitions. Additionally, context.mounted checks have been introduced in several places to prevent BuildContext usage after widget disposal, enhancing application stability.

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