fix(numberbox): skip traversal and inline buttons

[WinXaito]

I had some focus problems with the NumberBox (some ghost focus, handled by the Focus widget) and I don't think its relevant to have a focus on the inline button (if we works with the keyboard, we usually don't want the focus on the inline button. I may add a parameter for that if its necessary)

Pre-launch Checklist

• I have updated CHANGELOG.md with my changes
• I have run "dart format ." on the project (not on example app, lot of changes)
• I have added/updated relevant documentation

Before:

before.mp4

After:

after.mp4

Before / After with different Spin Buttons:

Before (inline mode):

before_2.mp4

After (compact)

after_2.mp4

After (inline)

after_3.mp4

[gemini-code-assist]

Code Review

This pull request addresses focus issues in the NumberBox widget by setting skipTraversal: true on its outer Focus widget and making the inline spin buttons non-focusable (focusable: false). A review comment identifies a typo in the CHANGELOG.md entry where "anymoregit" was written instead of "anymore" and provides a suggestion to fix it.

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