editor: Fix invalid excerpt panic in `Editor::hover_links` (#40387)

Fixes ZED-17N
Fixes ZED-26Z

Release Notes:

- N/A *or* Added/Fixed/Improved ...
87adc96e0fLukas Wirth committed on 10/16/2025, 2:32:46 PM· committed by GitHubparentfba7f4d
2 files changedLine totals unavailable