ImportScreen has no nav backstack, so an unkeyed hiltViewModel() resolved
to the Activity's ViewModelStore and was retained across imports. Its
one-shot `load` guard then showed the *previous* file's parsed state on
the next import — trivially reachable now that the in-app Restore button
lets you export→restore or restore twice in one session (worst case: the
picker still holds file A, so tapping Import writes A's events after you
picked B). Keying the VM by the file uri hands each distinct file a fresh
VM (fresh Loading state); the same uri (rotation) reuses it and holds the
result.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
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