replace gmail resync with Gmail REST API, remove mbsync dependency

First sync still uses IMAP with app password. Subsequent syncs use
Gmail API history.list + messages.get with OAuth for faster, more
reliable incremental sync. Dispatch gmail-sync handler for gmail
accounts instead of generic email-sync. Show sync button for synced
accounts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/reimport-gmail.ts

@@ -1,33 +0,0 @@
-import { join } from 'node:path';
-import { unlinkSync } from 'node:fs';
-import { openEmailDb } from '../src/servers/api/email/email-db';
-import { importMaildir } from '../src/servers/queue/handlers/gmail-sync';
-
-const DATA_PATH = process.env.DATA_PATH ?? join(process.cwd(), 'data');
-const email = process.argv[2];
-
-if (!email) {
-  console.error('Usage: bun scripts/reimport-gmail.ts <email>');
-  process.exit(1);
-}
-
-const maildirPath = join(DATA_PATH, email, 'Gmail', 'Maildir');
-const dbPath = join(DATA_PATH, email, 'emails.db');
-
-// Delete existing DB for a fresh import
-try {
-  unlinkSync(dbPath);
-  console.log(`Deleted ${dbPath}`);
-} catch {
-  console.log('No existing DB to delete');
-}
-
-const db = openEmailDb(email);
-
-console.log(`Importing from ${maildirPath}...`);
-const result = await importMaildir({ maildirPath, emailAccount: email, db, onProgress: (saved, skipped) => {
-  process.stdout.write(`\r  saved ${saved}, skipped ${skipped}`);
-}});
-
-console.log(`\nDone: saved ${result.saved}, skipped ${result.skipped}, errors ${result.errors}`);
-db.close();