fix(mui): respect custom startIcon when hideText is true on all button components

[tysoncung]

Summary

Fixes #7343

When hideText=true, all MUI button components (ShowButton, EditButton, DeleteButton, CloneButton, CreateButton, ListButton, RefreshButton, SaveButton, ExportButton, ImportButton) ignored any custom startIcon passed via props and always rendered the hardcoded default icon as children. If a user also passed startIcon through rest props, it would render as the MUI Button startIcon slot AND the default icon would render as children — causing a double-icon display.

Root Cause

The startIcon prop was not extracted from the rest/spread props, so it was passed through to the MUI <Button> component via {...restProps}. Meanwhile, the component always rendered its default icon as children when hideText=true, resulting in two icons.

Fix

For all 10 affected button components:

1. Extract startIcon from the rest/spread props
2. When hideText=true: render startIcon ?? defaultIcon as the button's children (no startIcon prop on the Button itself)
3. When hideText=false: use startIcon ?? <DefaultIcon /> as the Button's startIcon prop

This ensures a user-provided startIcon is respected in both modes, with the default icon as fallback.

Affected Components

Component	Default Icon
ShowButton	VisibilityOutlined
EditButton	EditOutlined
DeleteButton	DeleteOutline
CloneButton	AddBoxOutlined
CreateButton	AddBoxOutlined
ListButton	ListOutlined
RefreshButton	RefreshOutlined
SaveButton	SaveOutlined
ExportButton	ImportExportOutlined
ImportButton	ImportExportOutlined

Testing

Added MUI-specific tests for ShowButton covering:

• Custom startIcon with hideText=true renders only the custom icon
• Default icon renders when hideText=true with no custom startIcon
• Custom startIcon used in startIcon slot when hideText=false

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Latest commit: f118c74

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