Optimize mobile layouts and fix integration tab overflow

Mobile Card Layout Improvements:
- Remove redundant Card/CardContent wrappers in mobile layouts
- Use simple div with border-2 border-border rounded-lg p-4 space-y-3 bg-card
- This provides wider cards without extra padding from wrapper div
- Applied to all admin pages: AdminProducts, AdminOrders, AdminMembers, AdminConsulting, AdminEvents

Integration Tab Fix:
- Remove redundant Calendar ID display in Alert component
- The Calendar ID is already visible in the input field above
- This Alert was causing horizontal overflow on mobile
- Alert showed 'OAuth configured. Calendar ID: {long_email}@group.calendar.google.com'
- Removing this eliminates the overflow issue

src/pages/admin/AdminConsulting.tsx

@@ -410,8 +410,8 @@ export default function AdminConsulting() {
                 {/* Mobile Card Layout */}
                 <div className="md:hidden space-y-3 p-4">
                   {upcomingSlots.map((slot) => (
-                    <Card key={slot.id} className="border-2 border-border">
-                      <CardContent className="p-4 space-y-3">
+                    <div key={slot.id} className="border-2 border-border rounded-lg p-4 space-y-3 bg-card">
+                      <div>
                         <div className="flex items-start justify-between gap-2">
                           <div className="flex-1 min-w-0">
                             <div className="flex items-center gap-2 flex-wrap mb-1">
@@ -540,8 +540,8 @@ export default function AdminConsulting() {
                 {/* Mobile Card Layout */}
                 <div className="md:hidden space-y-3 p-4">
                   {pastSlots.slice(0, 20).map((slot) => (
-                    <Card key={slot.id} className="border-2 border-border">
-                      <CardContent className="p-4 space-y-2">
+                    <div key={slot.id} className="border-2 border-border rounded-lg p-4 space-y-3 bg-card">
+                      <div>
                         <div className="flex items-start justify-between gap-2">
                           <div className="flex-1 min-w-0">
                             <h3 className="font-semibold text-sm">