fix: throw when getExplorerLink has no block explorer URL available

[gabitoesmiapodo]

Summary

• getExplorerLink previously produced undefined/address/... or undefined/tx/... when called without explorerUrl on a chain that has no blockExplorers configured
• Extracts baseUrl before building the URL and throws 'No block explorer URL available for this chain' when neither source provides a URL
• Adds a test covering the new throw behavior

Test plan

• pnpm test src/utils/getExplorerLink.test.ts — 5 tests pass
• Existing callers that always provide a chain with block explorers (or an explicit explorerUrl) are unaffected
• pnpm build passes

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Project	Deployment	Actions	Updated (UTC)
components.dappbooster	Ready	Preview, Comment	Mar 25, 2026 7:16pm
demo.dappbooster	Ready	Preview, Comment	Mar 25, 2026 7:16pm
docs.dappbooster	Ready	Preview, Comment	Mar 25, 2026 7:16pm

[Copilot]

Pull request overview

This PR hardens getExplorerLink by preventing generation of malformed explorer URLs when a chain has no configured block explorer and no explicit explorerUrl is provided.

Changes:

• Extracts a baseUrl once and throws when no explorer base URL is available.
• Simplifies URL construction for address/tx paths using the extracted baseUrl.
• Adds a Vitest suite covering the new throw behavior and existing URL generation paths.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/utils/getExplorerLink.ts	Centralizes explorer base URL selection and throws a clear error when missing.
src/utils/getExplorerLink.test.ts	Adds tests for address/tx URL generation, custom explorer override, and missing-explorer error case.

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