[IMPROVED] Migration code cleanup.
[FIXED] When local store migration fails, fall back to opening the old local store if possible.
[FIXED] Better migration of cloud preferences.
[FIXED] Better checking of when to perform cloud store migration.
[FIXED] Always migrate the local store, even when the cloud store is enabled.
[UPDATED] Removed the loading indicator in favor of a loading overlay.
[UPDATED] Sorted the file references lexicographically.
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