fix hide/show graph window

src/roast.ts

@@ -18,6 +18,7 @@ interface Window {
     logTemp?: Function; //function to log a temputure event
     exportCSV?: Function; //function to export the events to CSV
     showGraph?: Function; // function to render or display graphs using libraries like Chart.js for visual representation of logged events
+    hideGraph?: Function; //function to hind the graph popup
 }
 
 
@@ -168,6 +169,14 @@ function showGraph(): void {
     }
 }
 
+function hideGraph(): void {
+    const graphContainer = document.getElementById("graph-container");
+    if (graphContainer) {
+        graphContainer.classList.add("hidden");
+        graphContainer.classList.remove("graph-display-flex");
+    }
+}
+
 // Expose functions to the global scope (allowing html direct access)
 if (typeof window !== 'undefined') {
     window.startTimer = startTimer;
@@ -179,4 +188,5 @@ if (typeof window !== 'undefined') {
     window.logTemp = logTemp;
     window.exportCSV = exportCSV;
     window.showGraph = showGraph;
+    window.hideGraph = hideGraph;
 }