docs: fix the stablecoin trades page: working depeg filters, live wallet, Tron stream

[buddies2705]

Rewrites the stablecoin trades page so its examples run: the contradictory depeg filter becomes an any list with a USD floor and major counter tokens, the wallet example is a live USDC swapper, and the Tron stream uses the symbol filter that streams honour.

What changed

• PriceInUSD lt 0.95 gt 1.05 (an AND that matches nothing) replaced by any with two ranges, a USD floor and a counter-token list
• Depeg checks shown as 24-hour queries that return rows, with the stream form described
• Wallet flows by Transaction.Signer as a query and a stream; dead address replaced
• Tron stream filters Currency.Symbol; the contract-address filter is kept for queries
• sidebar_label, FAQ, related links; depeg anchor kept for the payments page link

Verification

• Every query and subscription on the page was executed with a live token: 4/4 queries returned rows; 5/5 subscriptions delivered messages within the timeout.

Fact checklist

• Tron subscriptions do not match Currency.SmartContract; Symbol works
• EVM address filters are case-insensitive in queries
• Solana wallet 3i51cKbLbaKAqvRJdCUaq9hsnvf9kqCfMujNgFj7nRKt swaps USDC many times an hour

IDE saved queries linked from this page are updated by IDE_QUERY_UPDATES_2026-09-venue.sql (repo root, git-excluded), to be run on the primary database.

Part of the crawled-not-indexed cleanup (P2 block): venue pages are rewritten around live examples so every query and stream on them returns data, and the three EVM screener pages are split so they stop being treated as copies of one another.

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