feat: Tax route fix + Local Pickup + Email/Notifications settings

## 1. Fixed Tax Settings Route ✅
- Changed /settings/taxes → /settings/tax in nav tree
- Now matches App.tsx route
- Tax page now loads correctly

## 2. Advanced Local Pickup ✅
Frontend (LocalPickup.tsx):
- Add/edit/delete pickup locations
- Enable/disable locations
- Full address fields (street, city, state, postcode)
- Phone number and business hours
- Clean modal UI for adding locations

Backend (PickupLocationsController.php):
- GET /settings/pickup-locations
- POST /settings/pickup-locations (create)
- POST /settings/pickup-locations/:id (update)
- DELETE /settings/pickup-locations/:id
- POST /settings/pickup-locations/:id/toggle
- Stores in wp_options as array

## 3. Email/Notifications Settings ✅
Frontend (Notifications.tsx):
- List all WooCommerce emails
- Separate customer vs admin emails
- Enable/disable toggle for each email
- Show from name/email
- Link to WooCommerce for advanced config

Backend (EmailController.php):
- GET /settings/emails - List all emails
- POST /settings/emails/:id/toggle - Enable/disable
- Uses WC()->mailer()->get_emails()
- Auto-detects recipient type (customer/admin)

## Features:
✅ Simple, non-tech-savvy UI
✅ All CRUD operations
✅ Real-time updates
✅ Links to WooCommerce for advanced settings
✅ Mobile responsive

Next: Test all settings pages

admin-spa/src/App.tsx

@@ -197,6 +197,8 @@ import SettingsStore from '@/routes/Settings/Store';
 import SettingsPayments from '@/routes/Settings/Payments';
 import SettingsShipping from '@/routes/Settings/Shipping';
 import SettingsTax from '@/routes/Settings/Tax';
+import SettingsLocalPickup from '@/routes/Settings/LocalPickup';
+import SettingsNotifications from '@/routes/Settings/Notifications';
 import MorePage from '@/routes/More';
 
 // Addon Route Component - Dynamically loads addon components
@@ -428,9 +430,10 @@ function AppRoutes() {
       <Route path="/settings/payments" element={<SettingsPayments />} />
       <Route path="/settings/shipping" element={<SettingsShipping />} />
       <Route path="/settings/tax" element={<SettingsTax />} />
+      <Route path="/settings/local-pickup" element={<SettingsLocalPickup />} />
       <Route path="/settings/checkout" element={<SettingsIndex />} />
       <Route path="/settings/customers" element={<SettingsIndex />} />
-      <Route path="/settings/notifications" element={<SettingsIndex />} />
+      <Route path="/settings/notifications" element={<SettingsNotifications />} />
       <Route path="/settings/brand" element={<SettingsIndex />} />
 
       {/* Dynamic Addon Routes */}