feat: improve mobile responsiveness across UI components

- Add responsive layout for action buttons (stack vertically on mobile, horizontal on sm+)
- Adjust card max-widths for better mobile display (LocationCard, MultiBillEdit)
- Improve button text sizing with responsive classes (text-sm on mobile, text-xs on sm+)
- Remove width constraints on file inputs and info boxes for full-width mobile layout
- Fine-tune icon positioning for better visual alignment

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

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

app/[locale]/home/multi-bill-edit/[year]/[month]/MultiBillEdit.tsx

@@ -107,7 +107,7 @@ export const MultiBillEdit: FC<MultiBillEditProps> = ({ locations, year, month }
             </div>
             <div className="p-[16px] pt-0">
                 {locations.map(location => (
-                    <div key={location._id} className="card card-compact card-bordered max-w-[30em] bg-base-100 border-1 border-neutral mb-2">
+                    <div key={location._id} className="card card-compact card-bordered max-w-[35em] bg-base-100 border-1 border-neutral mb-2">
                         <div className="card-body">
                             <h2 className="card-title text-[1rem]">
                                 {formatYearMonth(yearMonth)} {location.name}