Refactor: Recover middleware now uses RenderError + add full notifications view

- Replaced http.Error with helpers.RenderError in Recover middleware
- Custom 500.html now rendered with layout and topbar on panic
- RenderError gracefully checks template existence and falls back to plain response
- Added /account/notifications full view page (index)
- Linked "Back to notifications" from notification read view
- Fixed typo in template path for notifications/index.html
- Improved layout consistency across error and account pages

middleware/recover.go

@@ -4,6 +4,7 @@ import (
 	"log"
 	"net/http"
 	"runtime/debug"
+	"synlotto-website/helpers"
 )
 
 func Recover(next http.Handler) http.Handler {
@@ -12,7 +13,8 @@ func Recover(next http.Handler) http.Handler {
 			if rec := recover(); rec != nil {
 				log.Printf("🔥 Recovered from panic: %v\n%s", rec, debug.Stack())
 
-				http.Error(w, "Internal server error", http.StatusInternalServerError)
+				// ✅ Call your custom template-based fallback
+				helpers.RenderError(w, r, http.StatusInternalServerError)
 			}
 		}()
 		next.ServeHTTP(w, r)