feat(sync): add sync center and status surface

docs/reference/settings.md

@@ -64,6 +64,26 @@ Controls display style:
 - `uiAccentColor`
 - `menuFocusStyle`
 
+## Sync Center
+
+The settings hub includes a preview-first sync center for Codex CLI account sync.
+See [upgrade notes](../upgrade.md) for sync workflow changes.
+
+Before applying sync, it shows:
+
+- target path
+- current source path when available
+- last sync result for this session
+- preview summary (adds, updates, destination-only preserved accounts)
+- destination-only preservation behavior
+- backup and rollback context (`.bak`, `.bak.1`, `.bak.2`, `.wal`)
+
+Validation:
+
+- `npm run typecheck`
+- `npm run build`
+- `npm test`
+
 ---
 
 ## Experimental

lib/accounts.ts

@@ -22,7 +22,11 @@ import {
 	loadCodexCliState,
 	type CodexCliTokenCacheEntry,
 } from "./codex-cli/state.js";
-import { syncAccountStorageFromCodexCli } from "./codex-cli/sync.js";
+import {
+	commitCodexCliSyncRunFailure,
+	commitPendingCodexCliSyncRun,
+	syncAccountStorageFromCodexCli,
+} from "./codex-cli/sync.js";
 import { setCodexCliActiveSelection } from "./codex-cli/writer.js";
 
 export {
@@ -116,7 +120,9 @@ export class AccountManager {
 		if (synced.changed && sourceOfTruthStorage) {
 			try {
 				await saveAccounts(sourceOfTruthStorage);
+				commitPendingCodexCliSyncRun(synced.pendingRun);
 			} catch (error) {
+				commitCodexCliSyncRunFailure(synced.pendingRun, error);
 				log.debug("Failed to persist Codex CLI source-of-truth sync", {
 					error: String(error),
 				});