chore: add npm package metadata links

[xianzuyang9-blip]

Summary

• add package homepage metadata pointing to the repository README
• add npm-standard bugs.url metadata for the GitHub issue tracker

Verification

• npm view '@metamask/solana-wallet-snap@2.8.0' name version homepage repository bugs main files --json
• parsed packages/snap/package.json with Node after the edit
• npm pack --dry-run --json --ignore-scripts against a scratch copy of the package manifest

This is metadata-only and does not change runtime code.

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Note

Low Risk
Metadata-only manifest edits with no effect on snap runtime or published bundle behavior.

Overview
Adds standard npm package metadata to @metamask/solana-wallet-snap in packages/snap/package.json: a homepage field pointing at the repo README and a bugs.url field for the GitHub issue tracker.

No runtime, build, or dependency changes—only what registries and tooling surface for discoverability and support links.

^{Reviewed by Cursor Bugbot for commit 63bb3ba. Bugbot is set up for automated code reviews on this repo. Configure here.}