fix(app): prevent resize crash after Close File - #2603
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Closes #2598.
Close File cleared the canvas pixmap but left the main window's Image live, so a fit-mode resize treated an empty canvas as loaded and divided by zero. The shared reset now restores that invariant.
Verified in both Fit Window and Fit Width with 29 focused E2E tests, Ruff, Ty, and a real GUI close-and-resize flow.