Button CORE

Dark mode Background

Name and description	Type	Value
`[size]` Size of the button	`TuiSizeXS \| TuiSizeL`	`'l'`
`[loading]` Loading indicator (import `TuiButtonLoading` )	`boolean`
AppearanceApplied as a host directive
`[appearance]` Appearance of the element	`string`	`'primary'`
`[tuiAppearanceState]` Manual interactive state override	`TuiInteractiveState \| null`	`null`
`[tuiAppearanceFocus]` Manual focus state override	`null \| boolean`	`null`
`[tuiAppearanceMode]` Custom manual mode for the appearance	`null \| string[] \| string`	`null`
IconsApplied as a host directive
`[iconStart]` Icon on the left side	`string`	`''`
`[iconEnd]` Icon on the right side	`string`	`''`