Implement waker for UI events processing

[AlixANNERAUD]

This pull request introduces improvements to the event handling and asynchronous behavior of the Window system, especially in the file_manager and settings executables. The main changes center around making event loops more responsive by removing fixed sleep intervals and implementing an async waker-based system for UI event processing. Additionally, the Window struct is extended to support async yielding, allowing tasks to efficiently wait for new UI events.

Event loop and async improvements:

• Replaced the fixed task::sleep delay in the main event loops of file_manager and settings with an efficient, event-driven approach—now the loops simply await handle_events() without sleeping, improving responsiveness and reducing unnecessary wakeups. [1] [2]
• Modified the handle_events method in both FileManager and Settings to use the new window.yield_now().await mechanism, which asynchronously yields until new events are available, instead of relying on polling and sleeping. [1] [2]

Window struct and event system enhancements:

• Added a waker registration system to Window using an AtomicWaker, and updated event callbacks to wake any registered waker when new events arrive. This enables efficient async notification of UI events. [1] [2] [3] [4] [5]
• Introduced the yield_now async method on Window, which returns a future that resolves when the next event is available, integrating seamlessly with async/await.

Minor codebase maintenance:

• Added missing imports (poll_fn, log, etc.) and minor refactoring for clarity and future extensibility in settings.rs and related files. [1] [2]

These changes collectively make the UI event system more efficient and idiomatic for async Rust, improving both responsiveness and power efficiency.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 42 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
modules/graphics/src/window.rs	0.00%	32 Missing ⚠️
executables/settings/src/settings.rs	0.00%	7 Missing ⚠️
executables/file_manager/src/file_manager.rs	0.00%	1 Missing ⚠️
executables/file_manager/src/lib.rs	0.00%	1 Missing ⚠️
executables/settings/src/lib.rs	0.00%	1 Missing ⚠️

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