Enable WalletConnect direct signing

[towanTG]

Summary

• enable WalletConnect direct signing flags for Cosmos, Kujira, Maya, THORChain, Near, and Tron
• replace the THOR-only custom broadcast path with a WalletConnect Cosmos Amino signer wired into the standard Cosmos toolboxes
• make the NEAR WalletConnect signer use sign-and-send instead of returning a fake signed transaction tuple
• add a regression test and changeset for @swapkit/wallets

Verification

• bun test
• bun run --filter @swapkit/wallets type-check
• bun biome check packages/wallets/src/walletconnect/index.ts packages/wallets/test/walletconnect.test.ts
• bun run build:ci

Note: full bun biome check . still reports pre-existing package.json formatting issues in untouched files.