[seer-by-sentry]

Fixes CLIENT-1QZ. The issue was that: Access violation read 0x0 occurs when Windows UI/Audio components crash during IME context initialization due to an invalid state.

• Introduced a global flag, gIMEInitialized, to track the completion of IMEManager initialization.
• Updated WinMain::WndProc to only process IME messages via TheIMEManager->serviceIMEMessage if gIMEInitialized is true, preventing premature message handling.
• Set gIMEInitialized = true in GameClient::init immediately following TheIMEManager->init().
• Added a null check for m_candidateWindow in IMEManager::init before accessing its methods, guarding against potential crashes if the window script fails to load.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 8180239

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