feat: migrate from HashRouter to BrowserRouter for SEO

Phase 1: WordPress Rewrite Rules
- Add rewrite rule for /store/* to serve SPA page
- Add use_browser_router setting toggle (default: true)
- Flush rewrite rules on settings change

Phase 2: React Router Migration
- Add BrowserRouter with basename from WordPress config
- Pass basePath and useBrowserRouter to frontend
- Conditional router based on setting

Phase 3: Hash Route Migration
- Update EmailManager.php reset password URL
- Update EmailRenderer.php login URL
- Update TemplateOverride.php WC redirects
- All routes now use path format by default

This enables proper SEO indexing as search engines
can now crawl individual product/page URLs.

includes/Core/Notifications/EmailRenderer.php

@@ -259,7 +259,17 @@ class EmailRenderer {
 			// Generate login URL (pointing to SPA login instead of wp-login)
 			$appearance_settings = get_option('woonoow_appearance_settings', []);
 			$spa_page_id = $appearance_settings['general']['spa_page'] ?? 0;
-			$login_url = $spa_page_id ? get_permalink($spa_page_id) . '#/login' : wp_login_url();
+			$use_browser_router = $appearance_settings['general']['use_browser_router'] ?? true;
+			
+			if ($spa_page_id) {
+				$spa_url = get_permalink($spa_page_id);
+				// Use path format for BrowserRouter, hash format for HashRouter
+				$login_url = $use_browser_router 
+					? trailingslashit($spa_url) . 'login'
+					: $spa_url . '#/login';
+			} else {
+				$login_url = wp_login_url();
+			}
 			
 			$variables = array_merge($variables, [
 				'customer_id' => $data->get_id(),