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dwindown 2e1083039d fix: Channel toggle not working and multiple API calls

## 🐛 Bug Fixes

### Issue 1: Toggle Not Saving
**Problem:** Channel toggle always returned `enabled: true`
**Root Cause:** Backend using `get_param()` instead of `get_json_params()`
**Fix:** Updated `toggle_channel()` to properly parse JSON POST data

**Backend Changes:**
```php
// Before
$channel_id = $request->get_param('channelId');
$enabled = $request->get_param('enabled');

// After
$params = $request->get_json_params();
$channel_id = isset($params['channelId']) ? $params['channelId'] : null;
$enabled = isset($params['enabled']) ? $params['enabled'] : null;
```

### Issue 2: Multiple API Calls (3x)
**Problem:** Single toggle triggered 3 requests
**Root Cause:** Query invalidation causing immediate refetch
**Fix:** Implemented optimistic updates with rollback

**Frontend Changes:**
- ✅ `onMutate` - Cancel pending queries + optimistic update
- ✅ `onSuccess` - Show toast only
- ✅ `onError` - Rollback + show error
- ✅ `onSettled` - Refetch to sync with server

**Request Flow:**
```
Before: Toggle → API call → Invalidate → Refetch (3 requests)
After:  Toggle → Optimistic update → API call → Refetch (2 requests)
```

### Benefits

1. **Instant UI feedback** - Toggle responds immediately
2. **Fewer API calls** - Reduced from 3 to 2 requests
3. **Error handling** - Automatic rollback on failure
4. **Better UX** - No flickering or delays

### Testing

- [x] Toggle email channel on/off
- [x] Toggle push channel on/off
- [x] Verify state persists on reload
- [x] Check network tab for request count
- [x] Test error handling (disconnect network)

---

**Channel toggles now work correctly!** ✅

2025-11-11 15:45:33 +07:00