Refactor: Streamline product management UI and enhance PWA behavior

**Product List Improvements:**
- Move Import/Export to settings menu for cleaner interface
- Replace Edit/Variants/Multi-Buys buttons with single Details action
- Remove Blazor UI button from product list
- Simplify product row actions for better mobile UX

**Product Details Enhancements:**
- Add Danger Zone section with Delete button at bottom
- Improve visual hierarchy and action placement

**Navigation Updates:**
- Remove hamburger menu toggle (desktop nav always visible)
- Rename Settings to Menu in mobile bottom nav
- Update settings drawer header and icon

**Code Cleanup:**
- Remove unused Blazor, Variations, and Variants endpoints (243 lines)
- Consolidate variant/multi-buy management within product details
- Clean up ProductsController for better maintainability

**PWA & Notifications:**
- Add proper PWA support detection (only show if browser supports)
- Implement session-based notification prompt tracking
- Prevent repeated prompts after dismissal in same session
- Respect permanent dismissal preferences
- Enhance iOS Safari detection and instructions

**Technical Details:**
- 6 files changed, 96 insertions(+), 286 deletions(-)
- Build successful with 0 errors
- All features production-ready

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

LittleShop/wwwroot/js/pwa.js

@@ -220,10 +220,20 @@ class PWAManager {
     }
 
     showManualInstallButton() {
+        // Don't show if PWA is not supported or already installed
         if (this.isInstalled() || document.getElementById('pwa-install-btn')) {
             return;
         }
 
+        // Only show if browser supports PWA (has beforeinstallprompt event or is iOS)
+        const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
+        const supportsPWA = 'serviceWorker' in navigator && ('BeforeInstallPromptEvent' in window || isIOS);
+
+        if (!supportsPWA) {
+            console.log('PWA: Browser does not support PWA installation');
+            return;
+        }
+
         const installBtn = document.createElement('button');
         installBtn.id = 'pwa-install-btn';
         installBtn.className = 'btn btn-primary btn-sm';
@@ -269,12 +279,17 @@ class PWAManager {
             const isChrome = navigator.userAgent.includes('Chrome');
             const isEdge = navigator.userAgent.includes('Edge');
             const isFirefox = navigator.userAgent.includes('Firefox');
+            const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
 
             let instructions = 'To install this app:\n\n';
 
-            if (isChrome || isEdge) {
+            if (isIOS) {
+                instructions += '1. Tap the Share button (□↑) in Safari\n';
+                instructions += '2. Scroll down and tap "Add to Home Screen"\n';
+                instructions += '3. Tap "Add" to install';
+            } else if (isChrome || isEdge) {
                 instructions += '1. Look for the install icon (⬇️) in the address bar\n';
-                instructions += '2. Or click the browser menu (⋮) → "Install LittleShop Admin"\n';
+                instructions += '2. Or click the browser menu (⋮) → "Install TeleShop Admin"\n';
                 instructions += '3. Or check if there\'s an "Install app" option in the browser menu';
             } else if (isFirefox) {
                 instructions += '1. Firefox doesn\'t support PWA installation yet\n';