fix: text length code cleanup

[IvanIhnatsiuk]

Summary

This pull request refactors several classes to consistently use the length() and editableText APIs instead of directly accessing the text property or its length. This improves reliability and clarity, especially when dealing with editable text fields and their spans.

Consistent text length and access handling:

• Replaced usages of text?.length with length() in EnrichedDragHandler, EnrichedTextInputView, and EnrichedSelection to ensure accurate and null-safe text length retrieval.
• Updated references from text to editableText when accessing or modifying the text content in CheckListClickHandler and EnrichedTextInputView, ensuring that operations are performed on the editable buffer.

These changes enhance code safety and maintainability by standardizing how text content is accessed and manipulated across the codebase.

Test Plan

Provide clear steps so another contributor can reproduce the behavior or verify the feature works.
For example:

• Steps to reproduce the bug (if this is a bug fix)
• Steps to verify the new feature
• Expected vs actual results
• Any special conditions or edge cases to test

Screenshots / Videos

Include any visual proof that helps reviewers understand the change — UI updates, bug reproduction or the result of the fix.

Compatibility

OS	Implemented
iOS	❌
Android	✅

[Copilot]

Pull request overview

This pull request standardizes text access and length calculations across the Android editor implementation by preferring length() and editableText over direct text?.length / text usage, improving consistency when working with editable buffers and spans.

Changes:

• Replaced several text?.length ?: 0 usages with length() for consistent bounds clamping.
• Switched span-related operations from text to editableText to ensure operations apply to the editable spannable buffer.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
android/src/main/java/com/swmansion/enriched/utils/EnrichedSelection.kt	Uses view.length() for selection clamping instead of text?.length.
android/src/main/java/com/swmansion/enriched/EnrichedTextInputView.kt	Updates selection clamping and span redraw logic to use length() / editableText.
android/src/main/java/com/swmansion/enriched/EnrichedDragHandler.kt	Uses view.length() for pre-drop text length capture.
android/src/main/java/com/swmansion/enriched/CheckListClickHandler.kt	Uses editableText as the spannable source for checklist span hit-testing and toggling.

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