fix(chains): correct Sova block explorer default URL

[esorense]

What is this PR solving?

This PR fixes a typo in the Sova chain definition:

• src/chains/definitions/sova.ts
• blockExplorers.default.url was hhttps://explorer.sova.io
• corrected to https://explorer.sova.io

This is a real correctness issue (not a design change).
The invalid scheme can break URL parsing and cause explorer-link checks/usages to fail.

Alternatives considered

• Keep the current value and rely on consumers to handle malformed URLs.
  • Rejected: pushes a bad config downstream.
• Add runtime normalization/fallback for malformed explorer URLs.
  • Rejected: unnecessary complexity for a single source typo.
• Apply a minimal source fix in the chain definition.
  • Chosen: smallest, safest, and most maintainable change.

Reviewer attention

Please focus on:

• The one-line change in src/chains/definitions/sova.ts.
• Confirming no unrelated chain definitions were modified.

Documentation impact

No documentation changes are required (no API or behavior contract changes beyond correcting bad data).

Tests

No new tests were added because existing coverage already validates explorer URLs in test/scripts/chains.test.ts (blockExplorer.url check).
This change is intended to make Sova pass that existing path with a valid URL scheme.

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