text: Title: Issue with column widths in document chooser when there are long filenames
  Body: ### Issue Summary
  
  When there are long filenames (without spaces) for documents, the column widths of the table in the document chooser are stretched (especially when the browser width is narrow) so it is difficult to read the document title.
  
  ### Steps to Reproduce
  
  1. Upload a document with a long filename (with no spaces)
  2. Edit a page with a document chooser
  3. View the modal in a narrow browser window
  
  See attached screengrab
  
  ![image](https://github.com/user-attachments/assets/8c24ccbe-5170-4aaa-a082-9f27e4356741)
  
  ### Technical details
  
  -   Python version: unknown, I'm just raising this from an editorial perspective
  -   Django version: unknown, I'm just raising this from an editorial perspective
  -   Wagtail version: 6.1.3
  -   Browser version: Chrome 128
  
  ### Working on this
  
  
  
  Anyone can contribute to this. View our [contributing guidelines](https://docs.wagtail.org/en/latest/contributing/index.html), add a comment to the issue once you’re ready to start.
  