fix(twitter): tolerate missing findGraphQLQueryId in tweets adapter

[zzhan111]

What

Guard the findGraphQLQueryId lookups in twitter/tweets.js so the adapter
tolerates the helper not being present.

Why

The 2026-05-25 refactor (f0cdfbf) extracted findGraphQLQueryId into
twitter/_helper.js for reuse across the Twitter adapters. That works when
adapters are executed with the helper loaded, but when tweets.js runs as a
standalone single-file eval (no _helper.js in scope), the bare call:

const userQueryId = findGraphQLQueryId('UserByScreenName', 'pLsOiyHJ1eFwPJlNmLp4Bg');

throws a ReferenceError before the hardcoded fallback id can ever be used —
so the adapter dies instead of degrading gracefully.

Change

const _findQueryId = typeof findGraphQLQueryId === 'function'
  ? findGraphQLQueryId
  : ((name, fallback) => fallback);
const userQueryId  = _findQueryId('UserByScreenName', 'pLsOiyHJ1eFwPJlNmLp4Bg');
const tweetsQueryId = _findQueryId('UserTweets', 'Y59DTUMfcKmUAATiT2SlTw');

When the shared helper is present it is used exactly as before; when it is
absent the adapter falls back to the hardcoded query ids. No behavioral change
for the helper-loaded path.

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