Suppress redeem failure toasts when the dialog shows inline errors

Addresses greptile review: failed redemption from the Add Shared Item dialog
showed both a toast and the inline error. redeemPendingIfPossible gains a
showFailureToasts flag; the manual dialog path turns it off, while the
deep-link path keeps toasting.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
5071199100Dara Adedeji committed on 7/6/2026, 6:22:21 PMparentb748269

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