fix: Improve UX when minting more than 50 NFTs in a single transaction

[JiwaniZakir]

Fixes #3365

Previously, users could configure mints exceeding MAX_NFTS_PER_MINT in MintItemsModal and attempt to submit the transaction, only receiving an error after the fact. The modal had no pre-submission validation against the per-transaction mint limit. MintItemsModal.tsx now computes exceedsLimit by comparing totalMints against MAX_NFTS_PER_MINT after the reduce, disables the submit button via isDisabled, and surfaces a localized warning via t('mint_items_modal.limit_reached') in the existing error row before the user attempts submission. Verified by manually entering mint amounts exceeding 50 and confirming the button disables and the error message renders inline.

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[RocioCM]

Closing as the issue is already solved by #3367

[JiwaniZakir]

The inline validation approach is solid — catching the limit before submission is much better UX than surfacing a transaction error after the fact. One thing worth confirming: does exceedsLimit also handle the edge case where individual item quantities are modified after an initial valid total, or does it only recompute on explicit user input changes? Also, since @cyaiox noted this is fixed in #3367, it may be worth checking whether that PR's implementation handles the same validation path before closing this one out.