fix(cli): accept /s/ share URLs in import

[AayushMainali-Github]

Issue for this PR

Closes#36395

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

opencode import only accepted /share/<id> URLs. Share links in GitHub PR bodies still use /s/<id>, and opencode pr tries to import those, so import failed. parseShareUrl now accepts both /share/ and /s/. Updated the unit tests and the invalid-URL hint.

How did you verify your code works?

Ran bun test test/cli/import.test.ts in packages/opencode.

Screenshots / recordings

N/A

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

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