fix(wallets): trezorCoin returns Connect shortcuts

[Rob-Ferguson]

Fixes #529

Suite 26.8+ looks up Connect coin by shortcut only. Bitcoin / Testnet / Regtest throw Method_UnknownCoin.

trezorCoin() now returns btc / test / regtest. Shortcuts still work on 26.7.4. blockchainSetCustomBackend coin is regtest.

Address-confirm copy still says Bitcoin / Testnet / Regtest.

Tests assert "btc" and "test". No "regtest" assertion because TREZOR_DEV is captured at import.

@caravan/wallets minor: exported trezorCoin return values changed. Callers comparing to "Bitcoin" / "Testnet" / "Regtest" need to update.

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Latest commit: d3ca0b1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@caravan/wallets	Minor

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Project	Deployment	Actions	Updated (UTC)
caravan-coordinator	Ready	Preview	Aug 21, 2026 11:12pm

[jpcummins]

I ran through the manual Trezor test suite in the following scenarios:

Trezor Suite 26.7.4 without fix to establish baseline compatibility - 6 errors:

1. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH)
2. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH-P2WSH)
3. sign testnet transaction w/ 2 outputs and 3 inputs (P2WSH)
4. sign mainnet transaction w/ 2 outputs and 3 inputs (P2SH)
5. Confirm testnet P2SH multisig address
6. Confirm mainnet P2SH multisig address

Trezor Suite 26.7.4 with fix to test backwards compatibility - 6 errors. No new errors introduced:

1. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH)
2. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH-P2WSH)
3. sign testnet transaction w/ 2 outputs and 3 inputs (P2WSH)
4. sign mainnet transaction w/ 2 outputs and 3 inputs (P2SH)
5. Confirm testnet P2SH multisig address
6. Confirm mainnet P2SH multisig address

Trezor Suite 26.8.2 without fix to confirm additional errors - 1 failure, 8 errors

1. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH)
2. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH-P2WSH)
3. sign testnet transaction w/ 2 outputs and 3 inputs (P2WSH)
4. sign mainnet transaction w/ 2 outputs and 3 inputs (P2SH)
5. sign mainnet transaction w/ 2 outputs and 3 inputs (P2SH-P2WSH)
6. sign mainnet transaction w/ 2 outputs and 3 inputs (P2WSH)
7. Confirm testnet P2SH multisig address
8. [failure] Confirm testnet P2WSH multisig address
9. Confirm mainnet P2SH multisig address

Trezor Suite 26.8.2 with fix to confirm additional errors - 6 errors:

1. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH)
2. sign testnet transaction w/ 2 outputs and 3 inputs (P2SH-P2WSH)
3. sign testnet transaction w/ 2 outputs and 3 inputs (P2WSH)
4. sign mainnet transaction w/ 2 outputs and 3 inputs (P2SH)
5. Confirm testnet P2SH multisig address
6. Confirm mainnet P2SH multisig address

I've confirmed this patch fixes the issue and doesn't introduce any backward incompatibility or other new errors.