🐛 fix(search): close modal when clicking current page result

[welpo]

Summary

This PR fixes an issue where clicking on a search result that leads to the current page didn't close the search modal. The modal now closes correctly when clicking on such results, matching the behavior of hitting enter on a highlighted result.

Related issue

Resolves #348.

Changes

• Updated the click event listener for search results to check if the clicked link matches the current page URL.
• Implemented URL normalisation to handle cases with text fragments and trailing slashes.
• Added checks for Ctrl/Cmd key presses to allow opening results in new tabs without closing the modal.

Accessibility

The changes improve accessibility by ensuring consistent behavior between keyboard navigation (enter key) and mouse clicks for search results leading to the current page.

Type of change

• [x] Bug fix (fixes an issue without altering functionality)
• [ ] New feature (adds non-breaking functionality)
• [ ] Breaking change (alters existing functionality)
• [ ] UI/UX improvement (enhances user interface without altering functionality)
• [ ] Refactor (improves code quality without altering functionality)
• [ ] Documentation update
• [ ] Other (please describe below)

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Checklist

• [x] I have verified the accessibility of my changes
• [x] I have tested all possible scenarios for this change
• [ ] I have updated theme.toml with a sane default for the feature
• [ ] I have made corresponding changes to the documentation:
  • [ ] Updated config.toml comments
  • [ ] Updated theme.toml comments
  • [ ] Updated "Mastering tabi" post in English
  • [ ] (Optional) Updated "Mastering tabi" post in Spanish
  • [ ] (Optional) Updated "Mastering tabi" post in Catalan

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