kivy / kivy / 16702944722

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✨ feat: Add `on_ready` event to `App`: fire once after UI becomes visible (#9099)

* ✨ feat: Add `_first_swap_done` flag to `_WindowSDL3Storage`

Updated `_window_sdl3.pyx` to to track first frame render. These changes manage ready event triggering after first swap (by calling `App._trigger_ready_once()`)

* ✨ feat: Add `on_ready` event to App class to indicate when the UI is ready for interaction

- Document new `on_ready` event for UI readiness after first frame render
- Add `on_ready` to `__events__`
- Implement `on_ready` handler and `_trigger_ready_once` internal method

* ✅ test: Add unit test for `on_ready` event in Kivy Lifecycle

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