[lilbonekit]

• This PR suggests a bug fix and I've added the necessary tests.
• This PR introduces a new feature and I've discussed the update in an Issue or with the team.
• This PR is just a minor change like a typo fix.

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Closes #56.

LWK leaves explicit outputs out of balance() and per-transaction balances, so coins sent to the wallet's unconfidential addresses were missing from the token list, activity and snapshot getUTXOs. The fallback reader also dropped everything outside 0/0.

• Snapshot balances are now summed from the same UTXOs the snapshot returns, and the snapshot and fallback share one reader.
• Explicit coins are read at every external and change index under their own derivation path.
• Activity adds explicit inputs and outputs to LWK's per-transaction balance.
• CI: replaced jetli/wasm-pack-action, which fails with EXDEV when the lwk wasm cache misses, with taiki-e/install-action pinned to wasm-pack 0.14.0.

Max send is unchanged: the wallet's own send flow still spends confidential coins only.

[Arvolear]

LGTM!