feat: Standardize table UI across Orders and Products modules

**Issue:**
- Orders and Products had inconsistent table styling
- Orders: px-3 py-2, no hover, no header bg
- Products: p-3, hover effect, header bg

**Solution:**
1. Added comprehensive Table/List UI Standards to PROJECT_SOP.md
2. Updated Orders table to match Products standard

**Changes to PROJECT_SOP.md:**
- Added "Table/List UI Standards" section
- Defined required classes for all table elements
- Specified padding: p-3 (NOT px-3 py-2)
- Specified header: bg-muted/50 + font-medium
- Specified rows: hover:bg-muted/30
- Added empty state and mobile card patterns

**Changes to Orders/index.tsx:**
- Container: border-border bg-card → border (match Products)
- Header: border-b → bg-muted/50 + border-b
- Header cells: px-3 py-2 → p-3 font-medium text-left
- Body rows: Added hover:bg-muted/30
- Body cells: px-3 py-2 → p-3
- Empty state: px-3 py-12 → p-8 text-muted-foreground

**Result:**
✅ Consistent padding across all modules (p-3)
✅ Consistent header styling (bg-muted/50 + font-medium)
✅ Consistent hover effects (hover:bg-muted/30)
✅ Consistent container styling (overflow-hidden)
✅ Documented standard for future modules

PROJECT_SOP.md

@@ -260,6 +260,81 @@ When updating an existing module to follow this pattern:
 </Toolbar>
 ```
 
+#### Table/List UI Standards
+
+All CRUD list pages MUST follow these consistent UI patterns:
+
+**Table Structure:**
+```tsx
+<div className="hidden md:block rounded-lg border overflow-hidden">
+  <table className="w-full">
+    <thead className="bg-muted/50">
+      <tr className="border-b">
+        <th className="w-12 p-3">{/* Checkbox */}</th>
+        <th className="text-left p-3 font-medium">{__('Column')}</th>
+        {/* ... more columns */}
+      </tr>
+    </thead>
+    <tbody>
+      <tr className="border-b hover:bg-muted/30 last:border-0">
+        <td className="p-3">{/* Cell content */}</td>
+        {/* ... more cells */}
+      </tr>
+    </tbody>
+  </table>
+</div>
+```
+
+**Required Classes:**
+
+| Element | Classes | Purpose |
+|---------|---------|---------|
+| **Container** | `rounded-lg border overflow-hidden` | Rounded corners, border, hide overflow |
+| **Table** | `w-full` | Full width |
+| **Header Row** | `bg-muted/50` + `border-b` | Light background, bottom border |
+| **Header Cell** | `p-3 font-medium text-left` | Padding, bold, left-aligned |
+| **Body Row** | `border-b hover:bg-muted/30 last:border-0` | Border, hover effect, remove last border |
+| **Body Cell** | `p-3` | Consistent padding (NOT `px-3 py-2`) |
+| **Checkbox Column** | `w-12 p-3` | Fixed width for checkbox |
+| **Actions Column** | `text-right p-3` or `text-center p-3` | Right/center aligned |
+
+**Empty State Pattern:**
+```tsx
+<tr>
+  <td colSpan={columnCount} className="p-8 text-center text-muted-foreground">
+    <IconComponent className="w-12 h-12 mx-auto mb-2 opacity-50" />
+    {primaryMessage}
+    {helperText && <p className="text-sm mt-1">{helperText}</p>}
+  </td>
+</tr>
+```
+
+**Mobile Card Pattern:**
+```tsx
+<div className="md:hidden space-y-2">
+  {items.map(item => (
+    <Card key={item.id} className="p-4">
+      {/* Card content */}
+    </Card>
+  ))}
+</div>
+```
+
+**Rules:**
+1. ✅ **Always use `p-3`** for table cells (NOT `px-3 py-2`)
+2. ✅ **Always add `hover:bg-muted/30`** to body rows
+3. ✅ **Always use `bg-muted/50`** for table headers
+4. ✅ **Always use `font-medium`** for header cells
+5. ✅ **Always use `last:border-0`** to remove last row border
+6. ✅ **Always use `overflow-hidden`** on table container
+7. ❌ **Never mix padding styles** between modules
+8. ❌ **Never omit hover effects** on interactive rows
+
+**Responsive Behavior:**
+- Desktop: Show table with `hidden md:block`
+- Mobile: Show cards with `md:hidden`
+- Both views must support same actions (select, edit, delete)
+
 #### Variable Product Handling in Order Forms
 
 When adding products to orders, variable products MUST follow the Tokopedia/Shopee pattern:

admin-spa/src/routes/Orders/index.tsx

@@ -392,11 +392,11 @@ export default function Orders() {
           </div>
 
           {/* Desktop: Table */}
-          <div className="hidden md:block rounded-lg border border-border bg-card overflow-auto">
+          <div className="hidden md:block rounded-lg border overflow-hidden">
             <table className="min-w-[800px] w-full text-sm">
-              <thead className="border-b">
-                <tr className="text-left">
-                  <th className="px-3 py-2 w-12">
+              <thead className="bg-muted/50">
+                <tr className="border-b">
+                  <th className="w-12 p-3">
                     <Checkbox
                       checked={allSelected}
                       onCheckedChange={toggleAll}
@@ -404,39 +404,39 @@ export default function Orders() {
                       className={someSelected ? 'data-[state=checked]:bg-gray-400' : ''}
                     />
                   </th>
-                  <th className="px-3 py-2">{__('Order')}</th>
-                  <th className="px-3 py-2">{__('Date')}</th>
-                  <th className="px-3 py-2">{__('Customer')}</th>
-                  <th className="px-3 py-2">{__('Items')}</th>
-                  <th className="px-3 py-2">{__('Status')}</th>
-                  <th className="px-3 py-2 text-right">{__('Total')}</th>
-                  <th className="px-3 py-2 text-center">{__('Actions')}</th>
+                  <th className="text-left p-3 font-medium">{__('Order')}</th>
+                  <th className="text-left p-3 font-medium">{__('Date')}</th>
+                  <th className="text-left p-3 font-medium">{__('Customer')}</th>
+                  <th className="text-left p-3 font-medium">{__('Items')}</th>
+                  <th className="text-left p-3 font-medium">{__('Status')}</th>
+                  <th className="text-right p-3 font-medium">{__('Total')}</th>
+                  <th className="text-center p-3 font-medium">{__('Actions')}</th>
                 </tr>
               </thead>
               <tbody>
                 {filteredOrders.map((row) => (
-                  <tr key={row.id} className="border-b last:border-0">
-                    <td className="px-3 py-2">
+                  <tr key={row.id} className="border-b hover:bg-muted/30 last:border-0">
+                    <td className="p-3">
                       <Checkbox
                         checked={selectedIds.includes(row.id)}
                         onCheckedChange={() => toggleRow(row.id)}
                         aria-label={__('Select order')}
                       />
                     </td>
-                    <td className="px-3 py-2">
+                    <td className="p-3">
                       <Link className="underline underline-offset-2" to={`/orders/${row.id}`}>#{row.number}</Link>
                     </td>
-                    <td className="px-3 py-2 min-w-32">
+                    <td className="p-3 min-w-32">
                       <span title={row.date ?? ""}>
                         {formatRelativeOrDate(row.date_ts)}
                       </span>
                     </td>
-                    <td className="px-3 py-2">{row.customer || '—'}</td>
-                    <td className="px-3 py-2">
+                    <td className="p-3">{row.customer || '—'}</td>
+                    <td className="p-3">
                       <ItemsCell row={row} />
                     </td>
-                    <td className="px-3 py-2"><StatusBadge value={row.status} /></td>
-                    <td className="px-3 py-2 text-right tabular-nums font-mono">
+                    <td className="p-3"><StatusBadge value={row.status} /></td>
+                    <td className="p-3 text-right tabular-nums font-mono">
                       {formatMoney(row.total, {
                         currency: row.currency || store.currency,
                         symbol: row.currency_symbol || store.symbol,
@@ -446,7 +446,7 @@ export default function Orders() {
                         decimals: store.decimals,
                       })}
                     </td>
-                    <td className="px-3 py-2 text-center space-x-2">
+                    <td className="p-3 text-center space-x-2">
                       <Link className="btn text-sm underline underline-offset-2" to={`/orders/${row.id}`}>{__('Open')}</Link>
                       <Link className="btn text-sm underline underline-offset-2" to={`/orders/${row.id}/edit`}>{__('Edit')}</Link>
                     </td>
@@ -455,7 +455,7 @@ export default function Orders() {
 
                 {filteredOrders.length === 0 && (
                   <tr>
-                    <td className="px-3 py-12 text-center" colSpan={8}>
+                    <td className="p-8 text-center text-muted-foreground" colSpan={8}>
                       <div className="flex flex-col items-center gap-2">
                         <PackageOpen className="w-8 h-8 opacity-40" />
                         <div className="font-medium">{__('No orders found')}</div>