Cleanup: Finalize template context integration and remove legacy code

- Replaced legacy TemplateContext calls with structured TemplateData usage
- Removed unused variables and redundant storage calls in notifications handler
- Ensured consistent use of BuildTemplateData across user-facing handlers
- Resolved all compile-time errors from refactor
- Ready for runtime testing and further layout integration

handlers/draw_handler.go

@@ -14,7 +14,7 @@ func NewDraw(db *sql.DB) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		log.Println("➡️ New draw form opened")
 
-		context := BuildTemplateContext(db, w, r)
+		context := helpers.TemplateContext(w, r, models.TemplateData{})
 		context["Page"] = "new_draw"
 		context["Data"] = nil