Fix button alignment by removing negative margin

Remove mr-[-3em] from AddLocationButton, AddMonthButton, and PrintButton
to improve visual alignment and spacing consistency.

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

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

app/ui/AddMonthButton.tsx

@@ -19,7 +19,7 @@ export const AddMonthButton:React.FC<AddMonthButtonProps> = ({ yearMonth }) => {
     return(
         <div className="card card-compact shadow-s mb-4">
             <Link href={`/${locale}/year-month/${formatYearMonth(yearMonth)}/add`} className='grid self-center tooltip' data-tip={t("tooltip")}>
-                <span className='flex self-center mr-[-3em]'>
+                <span className='flex self-center'>
                     <CalendarDaysIcon className="h-[1em] w-[1em] cursor-pointer text-4xl"  />
                     <PlusCircleIcon className="h-[1em] w-[1em] cursor-pointer text-xl text-green-500 ml-[-.4em] mt-[-.4em]"  />
                     <span className="ml-1 mt-1 text-xs text-left leading-[1.2em] w-[6em]">{t("tooltip")}</span>