Updates multiple-selector.tsx styling

[abeisleem]

Please see commit messages for details:

They are: Commit 1: (f30df1be6259ced12cbe99a35ba9bf87a1877bab)

• Sets heights ... particularly useful when in a grid, because the used Command component is set to h-full so it expands to fit the grid cell. Instead sets to h-auto so height depend on that of it's children
• sets height of div to min-h-10 so it matches Shadcn Select and Input elements height size and h-full so it expand to fit selected elements (h-full is removed later in commit 3)
• sets CommandPrimitive.Input w-full when hidePlaceholderWhenSelected = true ... useful to prevent unnecessary new lines
• removes CommandList 's mt-2 in favor or top-1. uses top-1 instead of top-2 to match spacing between Shadcn's SelectTrigger and SelectContent

Commit 2 (0af15b0e24b9a878cacde0855aa760049390c448):

• Makes padding of wrapping div conditional on if items are selected and the CommandPrimitive.Input padding conditional on if NO items are selected. This is useful to 1) center the placeholder when no items are selected 2) make the whole component clickable when no elements are selected (instead of precisely clicking on the CommandPrimitive.Input 3) maintain the padding when items are selected
• Add's onClick() coupled with cursor-text on wrapping div so a click anywhere on the field focuses on the CommandPrimitive.Input
• Add ml-1 on CommandPrimitive.Input only when items are selected, again maintain same padding as existing Shadcn components

Commit 3: (c2609fdd22ba5fa82df83f8521811907b9d0bf88)

• Removes unnecessary h-full on wrapping div element

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