Marker link multiple pages with same name path fix

[Feldherren]

Pull Request Description

When editing a marker, and linking a marker to a page, the dropdown/popup/modal correctly populates with all pages that have a name matching the entered text, including what folder the page is in if multiple copies of it exist. However, when a page that shares a name with another page in a different folder is selected, the resulting link to a page does not take this into account, so often a marker ends up linking to the wrong page.
This pull request fixes this behaviour.

Changes Proposed

• Added getLinkText function to path.ts, which gets just a page name if unambiguous or gets the full path if more than one file exists with the same name (and also handles heading/id if entered)
• Updated onChooseItem in path.ts to use getLinkText
• Updated selectSuggestion in path.ts to use getLinkText

Related Issues

Fixes #450

Checklist

• I have read the contribution guidelines and code of conduct.
• I have tested the changes locally and they are working as expected.
• I have added appropriate comments and documentation for the code changes.
• My code follows the coding style and standards of this project.
• I have rebased my branch on the latest main (or master) branch.
• All tests (if applicable) have passed successfully.
• I have run linters and fixed any issues.
• I have checked for any potential security issues or vulnerabilities.

Screenshots (if applicable)

Entering the name of a page that is used for multiple pages:

Full path in Note to Open field:

Popup title (and preview) of page where the full path had to be used:

Pages that don't share their name with another page don't need or use the full path: