feat: attachment preview

Signed-off-by: Sebastian <krupinski01@gmail.com>

src/types/mediaViewer.ts

@@ -0,0 +1,9 @@
+import type { MessagePartInterface } from "@MailManager/types/message"
+
+export interface MediaViewerItem {
+  id: string
+  title: string
+  mime: string
+  size?: number | null
+  meta: { index: number; attachment: MessagePartInterface }
+}