first commit

Frontend/Electron/preload.cjs

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+const { contextBridge, ipcRenderer } = require('electron');
+
+contextBridge.exposeInMainWorld('cryptoAPI', {
+    deriveAuthKeys: (password, salt) => ipcRenderer.invoke('crypto:deriveAuthKeys', password, salt),
+    encryptData: (plaintext, keyHex, ivHex) => ipcRenderer.invoke('crypto:encryptData', plaintext, keyHex, ivHex),
+    decryptData: (ciphertext, keyHex, ivHex, tagHex) => ipcRenderer.invoke('crypto:decryptData', ciphertext, keyHex, ivHex, tagHex),
+    generateKeys: () => ipcRenderer.invoke('crypto:generateKeys'),
+    randomBytes: (size) => ipcRenderer.invoke('crypto:randomBytes', size),
+    sha256: (data) => ipcRenderer.invoke('crypto:sha256', data)
+});