fix(scan): show block time for txs via the indexed /tx fallback

[satyakwok]

Completes the pair with indexer-rs #66. The /tx fallback added in #97 hardcoded timestamp: "0" because the indexed payload had no time field; the indexer now returns top-level block_timestamp, so normalizeTx reads it (same pattern the legacy path already uses). Harmless before the indexer deploys — block_timestamp is just undefined → 0, identical to today.

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Reviewing files that changed from the base of the PR and between 58c2bf5 and 3c1d24b.

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• apps/scan/lib/api.ts

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