Resolve "node selection system refactor"

Closes #156 (closed)

electron/components/contextMenu.js

+const { Menu } = require('electron');
+const { BrowserWindow } = require('electron');
+const { sendToFrontend } = require('./ipc');
+
+const { screen } = require('electron');
+
+const contextTemplate = [
+    {
+        label: 'Ajouter',
+        submenu: [
+            {
+                label: 'Ajouter du texte',
+                click: () => { sendToFrontend(BrowserWindow.getFocusedWindow(),'addPage', { type: 'text', pos: getRelativeCursorPosition() }); }
+            },
+            {
+                label: 'Ajouter une vidéo',
+                click: () => { sendToFrontend(BrowserWindow.getFocusedWindow(), 'addPage', { type: 'video', pos: getRelativeCursorPosition() }); }
+            }
+        ]
+    },
+];
+
+function getRelativeCursorPosition() {
+    const cursorPosition = screen.getCursorScreenPoint();
+    // Get the position of the current window
+    const windowPosition = BrowserWindow.getFocusedWindow().getPosition();
+
+    // Calculate the cursor position relative to the current window
+    const cursorPositionRelativeToWindow = {
+        x: cursorPosition.x - windowPosition[0],
+        y: cursorPosition.y - windowPosition[1]
+    };
+
+    return cursorPositionRelativeToWindow;  
+}
+
+
+module.exports.popupMenu = Menu.buildFromTemplate(contextTemplate);
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