add-in: auto-open taskpane phase 1 + final save after versioning + tracking id = fid

- manifest: TaskpaneId -> Office.AutoShowTaskpaneWithDocument (auto-open marker), bump 1.0.0.4
- metadataService.enableAutoOpenTaskpane: tag doc setting (idempotent, best-effort) called from detect() after sign-in
- versionFlow: final saveDocumentVerified at end of both versioning flows (bug: stamped docx never persisted -> reopen showed untracked)
- tracking id now uses ticket fid (TRACKING_ID_SOURCE="fid", rollback by switching to "guid"), resolveTrackingId + authService.getCurrentFid
- WordAddinGate: restore history.pushState/replaceState that office.js nullifies in taskpane (fixes Next App Router crash)

Co-Authored-By: Claude Code <noreply@anthropic.com>

wordaddin/services/authService.ts

@@ -189,3 +189,9 @@ export async function getAccessToken(): Promise<string | null> {
 export function getUsername(): string | undefined {
   return username ?? undefined;
 }
+
+/** fid ของเอกสารปัจจุบัน (จาก ticket ที่ sign-in ผ่าน) — null = ยังไม่ได้ sign-in หรือโหมด demo
+ *  ใช้เป็น tracking id ตอน Start Versioning (versionFlow.resolveTrackingId, 2026-11-05) */
+export function getCurrentFid(): string | null {
+  return currentFid;
+}