Fix IMAP sync marking all emails as synced before fetching

Initialize newMaxUids with lastUid instead of mailbox maximum
to prevent marking unfetched emails as synced.

The bug sets newMaxUids to the highest UID before fetching,
causing all existing emails to be skipped when sync state
is saved early.

Fixes #45

packages/backend/src/services/ingestion-connectors/ImapConnector.ts

@@ -189,7 +189,10 @@ export class ImapConnector implements IEmailConnector {
 						currentMaxUid = lastMessage.uid;
 					}
 				}
-				this.newMaxUids[mailboxPath] = currentMaxUid;
+
+                                // Initialize with last synced UID, not the maximum UID in mailbox
+                                this.newMaxUids[mailboxPath] = lastUid || 0;
+
 
 				// Only fetch if the mailbox has messages, to avoid errors on empty mailboxes with some IMAP servers.
 				if (mailbox.exists > 0) {