[LEIP-409] Add StorageHelper with fallback to internal storage #77
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Creates a new StorageHelper utility class that provides robust storage selection with fallback logic. The helper tries primary external storage first (checking if it's mounted and writable), then falls back to internal storage if external is unavailable.
This replaces the previous approach where external storage was required and would throw exceptions if unavailable. The new approach ensures the app can always find a suitable storage location.
Changes: