feat: Complete subpage redesign - all 5 issues fixed!

## ✅ All 5 Issues Resolved!

### 1. Subject in Body ✅
**Before:** Subject in sticky header
**After:** Subject inside scrollable content (Editor tab)

- More consistent with form patterns
- Better scrolling experience
- Cleaner header

### 2. Tabs Scroll-Proof ✅
**Before:** Tabs inside scrollable area
**After:** Tabs sticky at top (like GitHub file viewer)

```tsx
<div className="-mt-6 mb-6 sticky top-0 z-10 bg-background pb-4">
  <Tabs>...</Tabs>
</div>
```

- Tabs always visible while scrolling
- Easy to switch Editor ↔ Preview
- Professional UX

### 3. Default Values Loading ✅
**Before:** Empty editor (bad UX)
**After:** Default templates load automatically

**Backend Fix:**
- Added `event_label` and `channel_label` to API response
- Templates now load from `TemplateProvider::get_default_templates()`
- Rich default content for all events

**Frontend Fix:**
- `useEffect` properly sets subject/body from template
- RichTextEditor syncs with content prop
- Preview shows actual content immediately

### 4. Page Width Matched ✅
**Before:** Custom max-w-7xl (inconsistent)
**After:** Uses SettingsLayout (max-w-5xl)

- Matches all other settings pages
- Consistent visual width
- Professional appearance

### 5. Mobile + Contextual Header ✅
**Before:** Custom header implementation
**After:** Uses SettingsLayout with contextual header

**Contextual Header Features:**
- Title + Description in header
- Back button
- Reset to Default button
- Save Template button (from SettingsLayout)
- Mobile responsive (SettingsLayout handles it)

**Mobile Strategy:**
- SettingsLayout handles responsive breakpoints
- Tabs stack nicely on mobile
- Cards adapt to screen size
- Touch-friendly buttons

---

## Architecture Changes:

**Before (Dialog-like):**
```
Custom full-height layout
├── Custom sticky header
├── Subject in header
├── Tabs in body
└── Custom footer
```

**After (Proper Subpage):**
```
SettingsLayout (max-w-5xl)
├── Contextual Header (sticky)
│   ├── Title + Description
│   └── Actions (Back, Reset, Save)
├── Sticky Tabs (scroll-proof)
└── Content (scrollable)
    ├── Editor Tab (Card)
    │   ├── Subject input
    │   └── Rich text editor
    └── Preview Tab (Card)
        ├── Subject preview
        └── Email preview
```

**Benefits:**
- ✅ Consistent with all settings pages
- ✅ Proper contextual header
- ✅ Mobile responsive
- ✅ Default templates load
- ✅ Scroll-proof tabs
- ✅ Professional UX

**Next:** Card insert buttons + Email appearance settings 🚀

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

@@ -2,17 +2,27 @@ import React, { useState, useEffect } from 'react';
 import { useNavigate, useSearchParams } from 'react-router-dom';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { api } from '@/lib/api';
+import { SettingsLayout } from '../components/SettingsLayout';
+import { Card, CardContent } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { RichTextEditor } from '@/components/ui/rich-text-editor';
 import { Label } from '@/components/ui/label';
-import { Badge } from '@/components/ui/badge';
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
-import { ArrowLeft, Eye, Edit, Save, RotateCcw } from 'lucide-react';
+import { ArrowLeft, Eye, Edit, RotateCcw } from 'lucide-react';
 import { toast } from 'sonner';
 import { __ } from '@/lib/i18n';
 
 export default function EditTemplate() {
+  // Mobile responsive check
+  const [isMobile, setIsMobile] = useState(false);
+  
+  useEffect(() => {
+    const checkMobile = () => setIsMobile(window.innerWidth < 768);
+    checkMobile();
+    window.addEventListener('resize', checkMobile);
+    return () => window.removeEventListener('resize', checkMobile);
+  }, []);
   const navigate = useNavigate();
   const [searchParams] = useSearchParams();
   const queryClient = useQueryClient();
@@ -43,40 +53,35 @@ export default function EditTemplate() {
     }
   }, [template]);
 
-  const saveMutation = useMutation({
-    mutationFn: async () => {
-      return api.post('/notifications/templates', {
+  const handleSave = async () => {
+    try {
+      await api.post('/notifications/templates', {
         eventId,
         channelId,
         subject,
         body,
       });
-    },
-    onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['notification-templates'] });
       queryClient.invalidateQueries({ queryKey: ['notification-template', eventId, channelId] });
       toast.success(__('Template saved successfully'));
-      navigate(-1);
-    },
-    onError: (error: any) => {
+    } catch (error: any) {
       toast.error(error?.message || __('Failed to save template'));
-    },
-  });
+      throw error;
+    }
+  };
 
-  const resetMutation = useMutation({
-    mutationFn: async () => {
-      return api.del(`/notifications/templates/${eventId}/${channelId}`);
-    },
-    onSuccess: () => {
+  const handleReset = async () => {
+    if (!confirm(__('Are you sure you want to reset this template to default?'))) return;
+    
+    try {
+      await api.del(`/notifications/templates/${eventId}/${channelId}`);
       queryClient.invalidateQueries({ queryKey: ['notification-templates'] });
       queryClient.invalidateQueries({ queryKey: ['notification-template', eventId, channelId] });
       toast.success(__('Template reset to default'));
-      navigate(-1);
-    },
-    onError: (error: any) => {
+    } catch (error: any) {
       toast.error(error?.message || __('Failed to reset template'));
-    },
-  });
+    }
+  };
 
   // Get variable keys for the rich text editor
   const variableKeys = Object.keys(variables);
@@ -166,88 +171,49 @@ export default function EditTemplate() {
     `;
   };
 
-  if (isLoading) {
-    return (
-      <div className="flex items-center justify-center h-64">
-        <div className="text-muted-foreground">{__('Loading...')}</div>
-      </div>
-    );
-  }
-
   if (!eventId || !channelId) {
     return (
-      <div className="flex items-center justify-center h-64">
+      <SettingsLayout
+        title={__('Edit Template')}
+        description={__('Template editor')}
+      >
         <div className="text-muted-foreground">{__('Invalid template parameters')}</div>
-      </div>
+      </SettingsLayout>
     );
   }
 
   return (
-    <div className="flex flex-col h-full">
-      {/* Header */}
-      <div className="border-b bg-background sticky top-0 z-10">
-        <div className="max-w-7xl mx-auto w-full px-6 py-4">
-          <div className="flex items-center justify-between">
-            <div className="flex items-center gap-4">
-              <Button
-                variant="ghost"
-                size="sm"
-                onClick={() => navigate(-1)}
-                className="gap-2"
-              >
-                <ArrowLeft className="h-4 w-4" />
-                {__('Back')}
-              </Button>
-              <div>
-                <h1 className="text-2xl font-bold">
-                  {__('Edit Template')}
-                </h1>
-                <p className="text-sm text-muted-foreground mt-1">
-                  {template?.event_label} - {template?.channel_label}
-                </p>
-                <p className="text-xs text-muted-foreground mt-1">
-                  {__('Customize the notification template. Use variables like {customer_name} to personalize messages.')}
-                </p>
-              </div>
-            </div>
-            <div className="flex items-center gap-2">
-            <Button
-              variant="outline"
-              onClick={() => resetMutation.mutate()}
-              disabled={saveMutation.isPending || resetMutation.isPending}
-              className="gap-2"
-            >
-              <RotateCcw className="h-4 w-4" />
-              {__('Reset to Default')}
-            </Button>
-            <Button
-              onClick={() => saveMutation.mutate()}
-              disabled={saveMutation.isPending || resetMutation.isPending}
-              className="gap-2"
-            >
-              <Save className="h-4 w-4" />
-              {saveMutation.isPending ? __('Saving...') : __('Save Template')}
-            </Button>
-            </div>
-          </div>
+    <SettingsLayout
+      title={template?.event_label || __('Edit Template')}
+      description={`${template?.channel_label} - ${__('Customize the notification template. Use variables like {customer_name} to personalize messages.')}`}
+      onSave={handleSave}
+      saveLabel={__('Save Template')}
+      isLoading={isLoading}
+      action={
+        <div className="flex items-center gap-2">
+          <Button
+            variant="ghost"
+            size="sm"
+            onClick={() => navigate(-1)}
+            className="gap-2"
+          >
+            <ArrowLeft className="h-4 w-4" />
+            {__('Back')}
+          </Button>
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={handleReset}
+            className="gap-2"
+          >
+            <RotateCcw className="h-4 w-4" />
+            {__('Reset to Default')}
+          </Button>
         </div>
-
-        {/* Subject */}
-        <div className="max-w-7xl mx-auto w-full px-6 pb-4">
-          <Label htmlFor="subject" className="text-sm">{__('Subject / Title')}</Label>
-          <Input
-            id="subject"
-            value={subject}
-            onChange={(e) => setSubject(e.target.value)}
-            placeholder={__('Enter notification subject')}
-            className="mt-2"
-          />
-        </div>
-      </div>
-
-      {/* Body - Tabs */}
-      <div className="flex-1 overflow-y-auto">
-        <div className="max-w-7xl mx-auto w-full px-6 py-6">
+      }
+    >
+      {/* Tabs - Sticky in header area */}
+      <div className="-mt-6 mb-6 sticky top-0 z-10 bg-background pb-4">
         <Tabs value={activeTab} onValueChange={setActiveTab} className="w-full">
           <TabsList className="grid w-full max-w-md grid-cols-2">
             <TabsTrigger value="editor" className="flex items-center gap-2">
@@ -259,9 +225,30 @@ export default function EditTemplate() {
               {__('Preview')}
             </TabsTrigger>
           </TabsList>
+        </Tabs>
+      </div>
 
-          {/* Editor Tab */}
-          <TabsContent value="editor" className="space-y-4 mt-6">
+      {/* Editor Tab */}
+      {activeTab === 'editor' && (
+        <Card>
+          <CardContent className="pt-6 space-y-6">
+            {/* Subject */}
+            <div className="space-y-2">
+              <Label htmlFor="subject">{__('Subject / Title')}</Label>
+              <Input
+                id="subject"
+                value={subject}
+                onChange={(e) => setSubject(e.target.value)}
+                placeholder={__('Enter notification subject')}
+              />
+              <p className="text-xs text-muted-foreground">
+                {channelId === 'email'
+                  ? __('Email subject line')
+                  : __('Push notification title')}
+              </p>
+            </div>
+
+            {/* Body */}
             <div className="space-y-2">
               <Label htmlFor="body">{__('Message Body')}</Label>
               <RichTextEditor
@@ -270,14 +257,30 @@ export default function EditTemplate() {
                 placeholder={__('Enter notification message')}
                 variables={variableKeys}
               />
+              <p className="text-xs text-muted-foreground">
+                {__('Use the toolbar to format text and insert variables.')}
+              </p>
             </div>
-          </TabsContent>
+          </CardContent>
+        </Card>
+      )}
 
-          {/* Preview Tab */}
-          <TabsContent value="preview" className="mt-6">
-            <div className="space-y-2">
-              <Label>{__('Email Preview')}</Label>
-              <div className="rounded-lg border bg-white overflow-hidden">
+      {/* Preview Tab */}
+      {activeTab === 'preview' && (
+        <Card>
+          <CardContent className="pt-6 space-y-4">
+            {/* Subject Preview */}
+            <div>
+              <Label className="text-sm text-muted-foreground">{__('Subject')}</Label>
+              <div className="mt-2 p-3 bg-muted/50 rounded-md font-medium">
+                {subject || <span className="text-muted-foreground italic">{__('(No subject)')}</span>}
+              </div>
+            </div>
+
+            {/* Email Preview */}
+            <div>
+              <Label className="text-sm text-muted-foreground">{__('Email Preview')}</Label>
+              <div className="mt-2 rounded-lg border bg-white overflow-hidden">
                 <iframe
                   srcDoc={generatePreviewHTML()}
                   className="w-full border-0"
@@ -292,14 +295,13 @@ export default function EditTemplate() {
                   }}
                 />
               </div>
-              <p className="text-xs text-muted-foreground">
+              <p className="text-xs text-muted-foreground mt-2">
                 {__('This is how your email will look. Dynamic variables are highlighted in yellow.')}
               </p>
             </div>
-          </TabsContent>
-        </Tabs>
-        </div>
-      </div>
-    </div>
+          </CardContent>
+        </Card>
+      )}
+    </SettingsLayout>
   );
 }