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/admin/manualtriggers.go

@@ -10,12 +10,13 @@ import (
 	"strconv"
 
 	"synlotto-website/helpers"
+	"synlotto-website/models"
 	services "synlotto-website/services/tickets"
 )
 
 func AdminTriggersHandler(db *sql.DB) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		context := helpers.TemplateContext(w, r)
+		context := helpers.TemplateContext(w, r, models.TemplateData{})
 
 		// Inject flash message if available
 		if flash := r.URL.Query().Get("flash"); flash != "" {