Refs #426: Add wikilink filename-with-spaces regression test

[devin-ai-integration]

Summary

Adds a regression test for issue #426 covering go-to-definition resolution for a wikilink pointing at a Markdown filename containing spaces.

The new test creates a temporary vault with:

• source.md containing [[git command]]
• git command.md as the target file

It then constructs a Vault, calls goto_definition, and asserts that exactly one definition is returned and that it points to git command.md.

Review & Testing Checklist for Human

• Confirm a test-only change is appropriate for Filenames containing spaces are not supported in wikilinks. #426, since the current resolver already handles the literal [[git command]] case.
• Verify the test captures the user-reported “jump” behavior accurately enough, or decide whether additional editor/LSP coverage is needed.
• Run cargo test gotodef::tests::wiki_link_to_filename_with_spaces_resolves or the full test suite locally if desired.

Notes

No production resolver logic is changed in this PR.

Link to Devin session: https://app.devin.ai/sessions/fe48ade6ff2f43a3a702a4652f42495f
Requested by: @Feel-ix-343

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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