Initial QOffice implementation

src/io/desktopOfficeFiles.ts

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+export type OfficeFileKind = "docx" | "xlsx" | "pptx" | "eml" | "mail";
+
+const mimeTypes: Record<OfficeFileKind, string> = {
+  docx: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+  xlsx: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+  pptx: "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+  eml: "message/rfc822",
+  mail: "application/octet-stream"
+};
+
+export function isDesktopOfficeBridgeAvailable() {
+  return Boolean(window.qoffice?.isDesktop && window.qoffice.openOfficeFile && window.qoffice.saveOfficeFile);
+}
+
+export async function openDesktopOfficeFile(kind: OfficeFileKind): Promise<File | null> {
+  const result = await window.qoffice?.openOfficeFile?.(kind);
+  if (!result || result.canceled) {
+    return null;
+  }
+
+  if (!result.base64Data) {
+    throw new Error("Desktop-оболочка QOffice не вернула данные файла.");
+  }
+
+  return new File([base64ToBytes(result.base64Data)], result.fileName ?? `qoffice.${kind}`, {
+    type: mimeTypes[kind]
+  });
+}
+
+export async function saveDesktopOfficeFile(kind: OfficeFileKind, defaultFileName: string, blob: Blob) {
+  const bridge = window.qoffice;
+  if (!bridge?.saveOfficeFile) {
+    throw new Error("Desktop-оболочка QOffice недоступна.");
+  }
+
+  const base64Data = bytesToBase64(new Uint8Array(await blob.arrayBuffer()));
+  return bridge.saveOfficeFile(kind, defaultFileName, base64Data);
+}
+
+export function bytesToBase64(bytes: Uint8Array) {
+  let binary = "";
+  const chunkSize = 0x8000;
+  for (let index = 0; index < bytes.length; index += chunkSize) {
+    binary += String.fromCharCode(...bytes.slice(index, index + chunkSize));
+  }
+  return btoa(binary);
+}
+
+export function base64ToBytes(base64Data: string) {
+  const binary = atob(base64Data);
+  const bytes = new Uint8Array(binary.length);
+  for (let index = 0; index < binary.length; index += 1) {
+    bytes[index] = binary.charCodeAt(index);
+  }
+  return bytes;
+}