fix(toolbar): fix issue mentioned in #290

[NaoCoding]

Fix #290

This pull request enhances the user experience in the shape and arrow picker toolbars by improving how the currently selected pointer is visually indicated and ensuring pointer type updates are handled consistently. The changes focus on adding selection state to toolbar buttons and updating pointer logic when toggling toolbars.

UI Improvements:

• Added a selected prop to both shape and arrow picker buttons, using PlaitBoard.isPointer to visually indicate which pointer is currently active. [1] [2]

Pointer Logic Updates:

• Updated the pointer type logic in the creation toolbar: when toggling the shape or arrow picker, the pointer type is set to either the current pointer or the button's pointer, depending on whether the current pointer matches the type being toggled. [1] [2]

Codebase Consistency:

• Updated imports to include PlaitBoard from @plait/core in both arrow-picker.tsx and shape-picker.tsx for the new selection logic. [1] [2]

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[pubuzhixing8]

LGTM, Thanks for you contributing @NaoCoding .