refactor: Simplify notification UI and improve UX

## ✅ UI/UX Improvements

### Channels Page

**Changes:**
1. ✅ Removed "Active/Inactive" badge (redundant with color)
2. ✅ Renamed "Built-in Channels" → "Channels"
3. ✅ Moved "Built-in" badge inline with title
4. ✅ Removed redundant "Subscribe" toggle for push
5. ✅ Unified "Enable/Disable" toggle for all channels
6. ✅ Auto-subscribe when enabling push channel

**Layout:**
- Title + Built-in badge (inline)
- Description
- Enable/Disable toggle + Configure button
- Green icon when enabled, gray when disabled

**Addon Channels:**
- Will show "Addon" badge instead of "Built-in"
- Same consistent layout

### Events Page

**Changes:**
1. ✅ Removed event-level toggle (too dense)
2. ✅ Cleaner header layout
3. ✅ Focus on per-channel toggles only

**Logic:**
- Each event can enable/disable specific channels
- Channel-level toggle (Channels page) = global on/off
- Per-event toggle (Events page) = event-specific on/off
- Both must be enabled for notification to send

### Expected Behavior

**Channel Toggle (Channels Page):**
- Disables/enables channel globally
- Affects all events
- Stored in `woonoow_email_notifications_enabled`
- Stored in `woonoow_push_notifications_enabled`

**Per-Event Channel Toggle (Events Page):**
- Enables/disables channel for specific event
- Stored in `woonoow_notification_settings`
- Independent per event

**Notification Sending Logic:**
```
if (channel_globally_enabled && event_channel_enabled) {
  send_notification();
}
```

---

**UI is now cleaner and more intuitive!** ✨

admin-spa/src/routes/Settings/Notifications/Channels.tsx

@@ -180,8 +180,8 @@ export default function NotificationChannels() {
         </div>
       </SettingsCard>
 
-      {/* Built-in Channels */}
-      <SettingsCard title={__('Built-in Channels')} description={__('Channels included with WooNooW')}>
+      {/* All Channels */}
+      <SettingsCard title={__('Channels')} description={__('Manage notification delivery channels')}>
         <div className="space-y-4">
           {builtinChannels.map((channel: NotificationChannel) => (
             <div key={channel.id} className="flex flex-col sm:flex-row sm:items-center gap-4 p-4 rounded-lg border bg-card">
@@ -192,19 +192,11 @@ export default function NotificationChannels() {
                 <div className="flex-1 min-w-0">
                   <div className="flex items-center gap-2 mb-2">
                     <h3 className="font-medium">{channel.label}</h3>
-                  </div>
-                  <div className="flex flex-wrap items-center gap-2 mb-2">
                     <Badge variant="secondary" className="text-xs">
                       {__('Built-in')}
                     </Badge>
-                    <Badge 
-                      variant={channel.enabled ? 'default' : 'secondary'} 
-                      className={`text-xs ${channel.enabled ? 'bg-green-500 hover:bg-green-600' : ''}`}
-                    >
-                      {channel.enabled ? __('Active') : __('Inactive')}
-                    </Badge>
                   </div>
-                  <p className="text-sm text-muted-foreground mt-1">
+                  <p className="text-sm text-muted-foreground">
                     {channel.id === 'email' &&
                       __('Email notifications powered by WooCommerce. Configure templates and SMTP settings.')}
                     {channel.id === 'push' &&
@@ -222,6 +214,10 @@ export default function NotificationChannels() {
                     checked={channel.enabled}
                     onCheckedChange={(checked) => {
                       toggleChannelMutation.mutate({ channelId: channel.id, enabled: checked });
+                      // If enabling push, also subscribe
+                      if (channel.id === 'push' && checked && pushSupported && !pushSubscribed) {
+                        subscribeToPush.mutate();
+                      }
                     }}
                     disabled={toggleChannelMutation.isPending}
                   />
@@ -239,24 +235,7 @@ export default function NotificationChannels() {
                   <Settings className="h-4 w-4 sm:mr-2" />
                   <span className="sm:inline">{__('Configure')}</span>
                 </Button>
-                {channel.id === 'push' && pushSupported && (
-                  <div className="flex items-center justify-between sm:justify-start gap-2 p-2 sm:p-0 rounded-lg sm:rounded-none border sm:border-0">
-                    <span className="text-sm text-muted-foreground">
-                      {pushSubscribed ? __('Subscribed') : __('Not subscribed')}
-                    </span>
-                    <Switch
-                      checked={pushSubscribed}
-                      onCheckedChange={(checked) => {
-                        if (checked) {
-                          subscribeToPush.mutate();
-                        } else {
-                          unsubscribeFromPush.mutate();
-                        }
-                      }}
-                      disabled={subscribeToPush.isPending || unsubscribeFromPush.isPending}
-                    />
-                  </div>
-                )}
+                
                 {channel.id === 'push' && !pushSupported && (
                   <Badge variant="destructive" className="text-xs w-full sm:w-auto justify-center">
                     {__('Not Supported')}

admin-spa/src/routes/Settings/Notifications/Events.tsx

@@ -130,12 +130,9 @@ export default function NotificationEvents() {
           <div className="space-y-6">
             {orderEvents.map((event: NotificationEvent) => (
               <div key={event.id} className="pb-6 border-b last:border-0">
-                <div className="flex items-start justify-between mb-4">
-                  <div className="flex-1">
-                    <h3 className="font-medium text-sm">{event.label}</h3>
-                    <p className="text-xs text-muted-foreground mt-1">{event.description}</p>
-                  </div>
-                  <Switch checked={event.enabled} disabled />
+                <div className="mb-4">
+                  <h3 className="font-medium text-sm">{event.label}</h3>
+                  <p className="text-xs text-muted-foreground mt-1">{event.description}</p>
                 </div>
 
                 {/* Channel Selection */}
@@ -193,12 +190,9 @@ export default function NotificationEvents() {
           <div className="space-y-6">
             {productEvents.map((event: NotificationEvent) => (
               <div key={event.id} className="pb-6 border-b last:border-0">
-                <div className="flex items-start justify-between mb-4">
-                  <div className="flex-1">
-                    <h3 className="font-medium text-sm">{event.label}</h3>
-                    <p className="text-xs text-muted-foreground mt-1">{event.description}</p>
-                  </div>
-                  <Switch checked={event.enabled} disabled />
+                <div className="mb-4">
+                  <h3 className="font-medium text-sm">{event.label}</h3>
+                  <p className="text-xs text-muted-foreground mt-1">{event.description}</p>
                 </div>
 
                 <div className="space-y-3">
@@ -255,12 +249,9 @@ export default function NotificationEvents() {
           <div className="space-y-6">
             {customerEvents.map((event: NotificationEvent) => (
               <div key={event.id} className="pb-6 border-b last:border-0">
-                <div className="flex items-start justify-between mb-4">
-                  <div className="flex-1">
-                    <h3 className="font-medium text-sm">{event.label}</h3>
-                    <p className="text-xs text-muted-foreground mt-1">{event.description}</p>
-                  </div>
-                  <Switch checked={event.enabled} disabled />
+                <div className="mb-4">
+                  <h3 className="font-medium text-sm">{event.label}</h3>
+                  <p className="text-xs text-muted-foreground mt-1">{event.description}</p>
                 </div>
 
                 <div className="space-y-3">