fix(mobile): prevent crash from null shortcut data

[sentry]

This PR addresses the TypeError: Cannot read property 'originId' of null that occurred when openHomeScreenShortcut was called with a shortcut item where item.data was null.

The original guard if (!item) return was insufficient, as it did not account for cases where the item itself was present but its data property was null. This led to a crash during background or shortcut launches when the OS delivered such an item.

The fix extends the guard to if (!item || !item.data) return, ensuring that the function safely returns early if either the item or its data payload is missing, thus preventing the null dereference.

Fixes BETTER-RAIL-49

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