Browser native confirm() dialog used for delete confirmation on Knowledge Base page

[androemeda]

Description

On the /admin/knowledge-base page, clicking the delete icon in the Actions column triggers a native browser confirm() dialog to confirm file deletion. This is inconsistent with the rest of the UI, looks unprofessional, and does not follow the app's design language.

Steps to Reproduce

1. Navigate to /admin/knowledge-base
2. Ensure at least one file is listed in the table
3. Click the red trash icon in the Actions column for any file
4. Observe that a native browser alert dialog appears:
   "Are you sure you want to delete this file?"

Screenshot

Proposed Fix

Replace the window.confirm() call in handleDeleteFile with a styled in-app modal dialog that:

• Displays the name of the file being deleted
• Provides Cancel and Delete buttons styled consistently with the site's blue-600, slate, and red-600 color palette