Fix stuck isAuthenticatingWithShortLivedToken blocking auto-reauth

[allgandalf]

Explanation of Change

session.isAuthenticatingWithShortLivedToken was a regular persisted Onyx field. when a SignInWithShortLivedAuthToken request was interrupted between optimisticData (set true) and finallyData (set false), the optimistic IndexedDB write was already committed and never got cleared. on every later page load the stuck true rehydrated, and the abort check in Reauthentication.ts blocked every reauth attempt, so the user could not recover from a 407 without "Clear Cache and Restart".

moved the flag to a new RAM-only Onyx key RAM_ONLY_IS_AUTHENTICATING_WITH_SHORT_LIVED_TOKEN. an interrupted request can no longer persist a stuck value, and anyone currently stuck recovers on the next page load because the new key starts undefined.

full RCA (with logs) on the tracking issue: https://github.com/Expensify/Expensify/issues/637360#issuecomment-4466727707

Fixed Issues

$ https://github.com/Expensify/Expensify/issues/637360
PROPOSAL: N/A (internal RCA, see linked comment)

Tests

1. Sign in to NewDot as any test user
2. In devtools console run this to simulate the stuck-flag state:

(async () => {
  const db = await new Promise((r) => { const o = indexedDB.open('OnyxDB'); o.onsuccess = e => r(e.target.result); });
  const tx = db.transaction('keyvaluepairs', 'readwrite');
  const store = tx.objectStore('keyvaluepairs');
  const session = await new Promise((r) => { const o = store.get('session'); o.onsuccess = e => r(e.target.result); });
  session.isAuthenticatingWithShortLivedToken = true;
  await new Promise((r) => { const o = store.put(session, 'session'); o.onsuccess = e => r(e.target.result); });
  console.log('poisoned; reload now');
})();

3. Hard reload the NewDot tab
4. Wait for the authToken to expire (or sit idle past the TTL)
5. Send any message in any DM
6. Expected (with the fix): message sends successfully. reauth runs silently and a fresh token replaces the stale one
7. Expected (without the fix on main): 407 + "Your session has expired. Please sign in again." toast

• Verify that no errors appear in the JS console

Offline tests

N/A. The offline write queue is not affected by this change.

QA Steps

Same as Tests above.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
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• I included screenshots or videos for tests on all platforms
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  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari