Correctly handle partially-claimed users (#380)

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## Summary by CodeRabbit

* **New Features**
* Multi-ticket bulk claim with checkbox selection and "Claim Selected"
action
  * Auto-claim when exactly one eligible ticket exists
* Batch processing with aggregated success/error reporting and bulk
success alert

* **Improvements**
* Clear separation of claimable vs unclaimable items with status labels
(already claimed, refunded, invalid)
* Updated modals, messaging and titles for multi-select flows;
Cancel/Close reset selection state
* Enhanced loading guards, camera controls and state resets for more
resilient scanning flows
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: devksingh4