Skip module-level reset on initial SESSION load in HybridApp

[MelvinBot]

Explanation of Change

On HybridApp mobile, when NVP_TRY_NEW_DOT fires before the SESSION callback on app start (a normal Onyx delivery ordering on native), the SESSION callback's unconditional reset of currentTryNewDot and isLoadingTryNewDot permanently breaks the module state. Since Onyx already delivered the NVP value, the NVP callback never re-fires, leaving isLoadingTryNewDot stuck at true. This causes closeReactNativeApp to silently no-op via shouldBlockOldAppExit.

This PR skips the module-level reset on the initial undefined → accountID SESSION transition. Real account switches (accountID1 → accountID2) and sign-outs still trigger the reset as before. A new test verifies the exact ordering that breaks today (NVP before SESSION).

Fixed Issues

$ #88243
PROPOSAL: #88243 (comment)

Tests

// TODO: The human co-author must fill out the tests you ran before marking this PR as "ready for review"
// Please describe what tests you performed that validates your changed worked.

• Verify that no errors appear in the JS console

Offline tests

N/A — this change affects module-level callback ordering, not network state.

QA Steps

// TODO: The human co-author must fill out the QA tests you ran before marking this PR as "ready for review".

• Verify that no errors appear in the JS console

PR Author Checklist

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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[abzokhattab]

is that a safe change or does it cause any regressions? @MelvinBot

[MelvinBot]

This change is safe — no regression risk.

The guard (isInitialSessionLoad) only fires when currentSessionAccountID was undefined before the callback, which happens in two cases:

1. First app launch — skipping the reset is correct because there's nothing stale to clear, and it prevents wiping currentTryNewDot that may have arrived before SESSION (the exact race condition this fixes).
2. After sign-out → sign-in — currentSessionAccountID becomes undefined during sign-out, but the reset block already ran during the sign-out callback (accountID transitioned from a number to undefined). Skipping the redundant reset on the next sign-in is harmless.

Account switches (accountID₁ → accountID₂) still hit the reset block as before because currentSessionAccountID is a number, not undefined.

Both paths are covered by existing tests (line 118–156 for account switches, line 158–181 for the NVP-before-SESSION race).