IJHack / QtPass / 24963287061

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fix: null check in focusInput to prevent segfault (#1188)

When focusInput() is triggered during a nested event loop (e.g., ConfigDialog
wizard on first-run) or via single-instance wake-up, the timer can fire before the
window is fully initialized, causing a segfault in QLineEdit::selectAll().

Add null and visibility checks in focusInput(). Also reorder messageAvailable()
to call show()/raise() before focusInput() to ensure window is visible before
focusing in the single-instance wake-up flow.

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