Fix: System-wide type hardening and V3 API alignment

src/lib/ae_utils/ae_utils__crypto.ts

@@ -15,9 +15,9 @@ export const encrypt_content = async function encrypt_content(content: string, k
         'encrypt'
     ]);
     const encodedContent = await crypto.subtle.encrypt(
-        { name: 'AES-CBC', iv },
+        { name: 'AES-CBC', iv: iv.buffer as ArrayBuffer },
         key,
-        new TextEncoder().encode(content)
+        new TextEncoder().encode(content).buffer as ArrayBuffer
     );
     const base64 = btoa(String.fromCharCode(...new Uint8Array(encodedContent)));
     if (log_lvl) {
@@ -79,9 +79,9 @@ export const decrypt_content = async function decrypt_content(
     ]);
     const encryptedContent = Uint8Array.from(atob(base64Content), (c) => c.charCodeAt(0));
     const decryptedContent = await crypto.subtle.decrypt(
-        { name: 'AES-CBC', iv },
+        { name: 'AES-CBC', iv: iv.buffer as ArrayBuffer },
         key,
-        encryptedContent
+        encryptedContent.buffer as ArrayBuffer
     );
     const decodedContent = new TextDecoder().decode(decryptedContent);
     // console.log('Decrypted Content:', decodedContent);