Style: Unify cart Continue Shopping button with wishlist style

Updated cart dropdown Continue Shopping buttons to use btn-outline
class (matching wishlist style) instead of btn-text across all pages.

Changes:
- shop.html: btn-text → btn-outline
- contact.html: btn-text → btn-outline
- product.html: btn-text → btn-outline
- about.html: btn-text → btn-outline

All cart Continue Shopping buttons now have consistent styling
with the wishlist Continue Shopping button (purple outline style).

PERFORMANCE_QUICK_REF.md

@@ -3,21 +3,25 @@
 ## What Was Done
 
 ### 🗄️ Database (Backend)
+
 - Added 6 new high-performance indexes
 - Total: **44 active indexes**
 - All tables analyzed and optimized
 - Vacuum completed for space reclamation
 
 ### 🚀 Frontend API Cache
+
 - New file: `api-cache.js` (intelligent caching)
 - Request deduplication (prevents duplicate calls)
 - Auto-cleanup every 60 seconds
 - Custom TTL per endpoint (5-30 minutes)
 
 ### 📄 Pages Updated
+
 All pages now use optimized API cache:
+
 - [home.html](website/public/home.html)
-- [shop.html](website/public/shop.html) 
+- [shop.html](website/public/shop.html)
 - [portfolio.html](website/public/portfolio.html)
 - [blog.html](website/public/blog.html)
 - [product.html](website/public/product.html)
@@ -35,6 +39,7 @@ Frontend-Backend:   ✅ Verified Working
 ## Verify It's Working
 
 ### 1. Browser Console (F12)
+
 ```javascript
 // You should see cache messages like:
 [Cache] FETCH: /api/products
@@ -46,11 +51,13 @@ window.apiCache.getStats()
 ```
 
 ### 2. Network Tab (F12 → Network)
+
 - First page visit: You'll see API calls
 - Navigate to another page and back: Fewer/no API calls
 - This means cache is working! 🎉
 
 ### 3. Command Line Test
+
 ```bash
 cd /media/pts/Website/SkyArtShop
 ./test-api-performance.sh
@@ -59,12 +66,14 @@ cd /media/pts/Website/SkyArtShop
 ## How It Works
 
 ### Before Optimization
+
 ```
 User → Page → fetch('/api/products') → Server → Database → Response
 User → Page → fetch('/api/products') → Server → Database → Response (duplicate!)
 ```
 
 ### After Optimization
+
 ```
 User → Page → apiCache.fetch('/api/products') → Server → Database → Response → CACHE
 User → Page → apiCache.fetch('/api/products') → CACHE (instant!) ⚡
@@ -73,13 +82,16 @@ User → Page → apiCache.fetch('/api/products') → CACHE (instant!) ⚡
 ## Cache Control
 
 ### Clear Cache Manually
+
 ```javascript
 // In browser console (F12)
 window.clearAPICache();  // Clears all cached data
 ```
 
 ### Adjust Cache Time
+
 Edit `website/public/assets/js/api-cache.js`:
+
 ```javascript
 this.ttlConfig = {
   '/api/products': 5 * 60 * 1000,   // 5 minutes (default)
@@ -90,6 +102,7 @@ this.ttlConfig = {
 ## Monitoring
 
 ### Check Active Indexes
+
 ```sql
 SELECT indexname FROM pg_indexes 
 WHERE schemaname = 'public' 
@@ -97,6 +110,7 @@ AND indexname LIKE 'idx_%';
 ```
 
 ### Watch PM2 Logs
+
 ```bash
 pm2 logs skyartshop
 ```
@@ -111,6 +125,7 @@ pm2 logs skyartshop
 ## What Was NOT Changed
 
 ✅ **Zero functionality changes**
+
 - All features work exactly the same
 - User experience unchanged
 - Admin panel unchanged  
@@ -122,16 +137,19 @@ pm2 logs skyartshop
 ## Troubleshooting
 
 ### Cache not working?
+
 1. Hard refresh: `Ctrl+Shift+R`
 2. Check console for errors
 3. Verify api-cache.js loads: `curl http://localhost:5000/assets/js/api-cache.js`
 
 ### Slow queries?
+
 1. Run: `./test-api-performance.sh`
 2. Check if responses are >50ms
 3. Review database indexes
 
 ### Pages not loading?
+
 1. Check PM2: `pm2 status`
 2. Check logs: `pm2 logs skyartshop`
 3. Restart: `pm2 restart skyartshop`