Removes the custom `bech32Polymod` and related Bech32 decoding functions from `js/nostr/nip46Client.js` in favor of using `nostr-tools` library implementation via `nip19.decode`. This reduces code duplication and relies on the standard library for decoding npubs.
Breaking Changes:
- None. `decodeNpubToHex` now strictly requires `nostr-tools` to be available, which is consistent with the rest of the file's dependencies.
Tests:
- Verified with targeted unit tests (`tests/nostr/nip46Client.test.js`).
- Verified with a reproduction script (`tests/repro_issue.mjs`) ensuring `decodeNpubToHex` correctly decodes valid npubs and handles invalid inputs.
Co-authored-by: PR0M3TH3AN <[email protected]>
