feat: polish invoice editor and viewer UI with custom NumberInput

component

- Create custom NumberInput component with increment/decrement buttons
- Add 0.25 step increments for hours and rates in invoice forms
- Implement emerald-themed styling with hover states and accessibility
- Add keyboard navigation (arrow keys) and proper ARIA support
- Condense invoice editor tax/totals section into efficient grid layout
- Update client dropdown to single-line format (name + email)
- Add fixed footer with floating action bar pattern matching business
  forms
- Redesign invoice viewer with better space utilization and visual
  hierarchy
- Maintain professional appearance and consistent design system
- Fix Next.js 15 params Promise handling across all invoice pages
- Resolve TypeScript compilation errors and type-only imports

src/components/ui/textarea.tsx

@@ -1,18 +1,18 @@
-import * as React from "react"
+import * as React from "react";
 
-import { cn } from "~/lib/utils"
+import { cn } from "~/lib/utils";
 
 function Textarea({ className, ...props }: React.ComponentProps<"textarea">) {
   return (
     <textarea
       data-slot="textarea"
       className={cn(
-        "border-input placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 flex field-sizing-content min-h-16 w-full rounded-md border bg-transparent px-3 py-2 text-base shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
-        className
+        "border-input placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive bg-background text-foreground flex field-sizing-content min-h-16 w-full resize-y rounded-md border px-3 py-2 text-sm shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50",
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
-export { Textarea }
+export { Textarea };