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/ui/LocationCard.tsx

@@ -48,7 +48,7 @@ export const LocationCard: FC<LocationCardProps> = ({ location, currency }) => {
     }
 
     return (
-        <div data-key={_id} className="card card-compact card-bordered max-w-[30em] bg-base-100 border-1 border-neutral my-1">
+        <div data-key={_id} className="card card-compact card-bordered sm:max-w-[35em] bg-base-100 border-1 border-neutral my-1">
             <div className="card-body">
                 <Link href={`/home/location/${_id}/edit`} className="card-subtitle tooltip" data-tip={t("edit-card-tooltip")}>
                     <Cog8ToothIcon className="h-[1em] w-[1em] absolute cursor-pointer top-[-.2rem] right-0 text-2xl" />