feat: add consumption tracking for services

Enhanced services module with comprehensive consumption tracking:
- Add usage field to ServiceBill interface (optional number)
- Add unit field to ServiceBill interface (kW, m³, or empty for internet)
- Updated AddServiceModal with consumption input field
- Auto-detect unit based on service type (electricity=kW, gas/water=m³, internet=none)
- Responsive grid layout for amount and consumption inputs
- Display consumption and unit in history list
- Show price per unit in history (amount/usage)
- Improved date display with responsive layout

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

app/services/page.tsx

@@ -105,12 +105,29 @@ export default function ServicesPage() {
                                             </div>
                                             <div>
                                                 <p className="text-white font-medium capitalize">{service?.label || bill.type}</p>
-                                                <p className="text-xs text-slate-500 capitalize">{new Date(bill.date).toLocaleDateString('es-AR', { dateStyle: 'long' })}</p>
+                                                <div className="flex flex-col sm:flex-row sm:items-center gap-1 sm:gap-2">
+                                                    <p className="text-xs text-slate-500 capitalize">{new Date(bill.date).toLocaleDateString('es-AR', { dateStyle: 'long' })}</p>
+                                                    {bill.usage && (
+                                                        <>
+                                                            <span className="hidden sm:inline text-slate-700">•</span>
+                                                            <p className="text-xs text-slate-400">
+                                                                Consumo: <span className="text-slate-300 font-medium">{bill.usage} {bill.unit}</span>
+                                                            </p>
+                                                        </>
+                                                    )}
+                                                </div>
                                             </div>
                                         </div>
                                         <div className="text-right">
                                             <p className="text-white font-mono font-medium">{formatCurrency(bill.amount)}</p>
-                                            <p className="text-xs text-slate-500 uppercase">{bill.period}</p>
+                                            <div className="flex flex-col items-end">
+                                                <p className="text-xs text-slate-500 uppercase">{bill.period}</p>
+                                                {bill.usage && bill.amount && (
+                                                    <p className="text-[10px] text-cyan-500/80 font-mono">
+                                                        {formatCurrency(bill.amount / bill.usage)} / {bill.unit}
+                                                    </p>
+                                                )}
+                                            </div>
                                         </div>
                                     </div>
                                 )

components/modals/AddServiceModal.tsx

@@ -22,11 +22,24 @@ export function AddServiceModal({ isOpen, onClose }: AddServiceModalProps) {
 
     const [type, setType] = useState('electricity')
     const [amount, setAmount] = useState('')
+    const [usage, setUsage] = useState('')
     const [period, setPeriod] = useState(new Date().toISOString().slice(0, 7)) // YYYY-MM
     const [date, setDate] = useState(new Date().toISOString().split('T')[0])
 
     if (!isOpen) return null
 
+    const getUnit = (serviceType: string) => {
+        switch (serviceType) {
+            case 'electricity': return 'kW'
+            case 'gas': return 'm³'
+            case 'water': return 'm³'
+            default: return ''
+        }
+    }
+
+    const unit = getUnit(type)
+    const showUsage = type !== 'internet'
+
     const handleSubmit = (e: React.FormEvent) => {
         e.preventDefault()
 
@@ -35,6 +48,8 @@ export function AddServiceModal({ isOpen, onClose }: AddServiceModalProps) {
         addServiceBill({
             type: type as any,
             amount: parseFloat(amount),
+            usage: usage ? parseFloat(usage) : undefined,
+            unit: unit || undefined,
             date: new Date(date).toISOString(),
             period: period,
             notes: ''
@@ -42,6 +57,7 @@ export function AddServiceModal({ isOpen, onClose }: AddServiceModalProps) {
 
         // Reset
         setAmount('')
+        setUsage('')
         onClose()
     }
 
@@ -81,22 +97,42 @@ export function AddServiceModal({ isOpen, onClose }: AddServiceModalProps) {
                         })}
                     </div>
 
-                    {/* Amount */}
+                    <div className="grid grid-cols-2 gap-4">
-                    <div className="space-y-2">
+                        {/* Amount */}
-                        <label className="text-xs font-medium text-slate-400 uppercase tracking-wider">Monto Factura</label>
+                        <div className={cn("space-y-2", !showUsage && "col-span-2")}>
-                        <div className="relative">
+                            <label className="text-xs font-medium text-slate-400 uppercase tracking-wider">Monto</label>
-                            <span className="absolute left-4 top-1/2 -translate-y-1/2 text-slate-400 font-semibold">$</span>
+                            <div className="relative">
-                            <input
+                                <span className="absolute left-4 top-1/2 -translate-y-1/2 text-slate-400 font-semibold">$</span>
-                                type="number"
+                                <input
-                                step="0.01"
+                                    type="number"
-                                placeholder="0.00"
+                                    step="0.01"
-                                value={amount}
+                                    placeholder="0.00"
-                                onChange={(e) => setAmount(e.target.value)}
+                                    value={amount}
-                                className="w-full pl-8 pr-4 py-3 bg-slate-950 border border-slate-800 rounded-lg focus:ring-2 focus:ring-cyan-500/50 focus:border-cyan-500 text-white text-lg font-mono outline-none"
+                                    onChange={(e) => setAmount(e.target.value)}
-                                required
+                                    className="w-full pl-8 pr-4 py-3 bg-slate-950 border border-slate-800 rounded-lg focus:ring-2 focus:ring-cyan-500/50 focus:border-cyan-500 text-white text-lg font-mono outline-none"
-                                autoFocus
+                                    required
-                            />
+                                    autoFocus
+                                />
+                            </div>
                         </div>
+
+                        {/* Usage */}
+                        {showUsage && (
+                            <div className="space-y-2">
+                                <label className="text-xs font-medium text-slate-400 uppercase tracking-wider">Consumo ({unit})</label>
+                                <div className="relative">
+                                    <input
+                                        type="number"
+                                        step="0.01"
+                                        placeholder="0"
+                                        value={usage}
+                                        onChange={(e) => setUsage(e.target.value)}
+                                        className="w-full px-4 py-3 bg-slate-950 border border-slate-800 rounded-lg focus:ring-2 focus:ring-cyan-500/50 focus:border-cyan-500 text-white text-lg font-mono outline-none"
+                                    />
+                                    <span className="absolute right-4 top-1/2 -translate-y-1/2 text-slate-500 text-sm font-medium">{unit}</span>
+                                </div>
+                            </div>
+                        )}
                     </div>
 
                     <div className="grid grid-cols-2 gap-4">

lib/types.ts

@@ -66,6 +66,8 @@ export interface ServiceBill {
   id: string
   type: 'electricity' | 'water' | 'gas' | 'internet'
   amount: number
+  usage?: number
+  unit?: string
   date: string
   period: string // YYYY-MM
   isPaid: boolean