fix: corrige scroll do dropdown e ajusta botão Adicionar

- Adiciona collisionPadding e overflow-hidden no SearchableCombobox
- Reduz tamanho do botão Adicionar no checklist (size=sm)
- Adiciona espaçamento antes do botão Adicionar

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/tickets/new-ticket-dialog.tsx

@@ -1514,7 +1514,7 @@ export function NewTicketDialog({
                       />
                       Obrigatório
                     </label>
-                    <Button type="button" onClick={handleAddChecklistItem} className="h-9 gap-2">
+                    <Button type="button" onClick={handleAddChecklistItem} size="sm" className="ml-2 gap-2">
                       <Plus className="size-4" />
                       Adicionar
                     </Button>

src/components/ui/searchable-combobox.tsx

@@ -126,7 +126,8 @@ export function SearchableCombobox({
       </PopoverTrigger>
       <PopoverContent
         id={listId}
-        className={cn("z-50 w-[var(--radix-popover-trigger-width)] max-w-[480px] p-0", contentClassName)}
+        className={cn("z-50 w-[var(--radix-popover-trigger-width)] max-w-[480px] overflow-hidden p-0", contentClassName)}
+        collisionPadding={16}
       >
         <div className="border-b border-border/80 p-2">
           <Input
@@ -157,7 +158,7 @@ export function SearchableCombobox({
           </>
         ) : null}
         <ScrollArea
-          className={cn("max-h-60", scrollClassName)}
+          className={cn("max-h-60 overflow-y-auto", scrollClassName)}
           {...scrollProps}
         >
           {filtered.length === 0 ? (