Core(Events): remove m_ prefix from the pointer observer & address review notes

[EugeniyKiyashko]

No description provided.

[Copilot]

Pull request overview

This PR updates DevExtreme’s internal pointer event infrastructure by renaming the pointer observer module to remove the legacy m_ prefix, and applies a small set of related refactors/cleanup notes in pointer strategies and keyboard processing.

Changes:

• Switched pointer observer re-exports/imports from m_observer to observer.
• Renamed the internal pointer strategy event-args type from PointerEventInit to PointerStrategyEventArgs and updated strategy implementations accordingly.
• Refactored KeyboardProcessor to use module-level namespaced event constants and to safely accept undefined/null options.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/devextreme/js/common/core/events/pointer/observer.js	Re-export updated to point to the renamed internal observer module.
packages/devextreme/js/__internal/events/pointer/observer.ts	Keeps observer implementation; minor default-callback cleanup.
packages/devextreme/js/__internal/events/pointer/base.ts	Renames pointer strategy args type; simplifies remove() logic.
packages/devextreme/js/__internal/events/pointer/mouse.ts	Updates imports/types to reference observer and new args type.
packages/devextreme/js/__internal/events/pointer/touch.ts	Updates imports/types to new args type and observer type export.
packages/devextreme/js/__internal/events/pointer/mouse_and_touch.ts	Updates imports/types to new args type and observer type export.
packages/devextreme/js/__internal/events/core/keyboard_processor.ts	Uses module-level namespaced event strings; constructor now tolerates null/undefined options.

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