### Purpose
Setting default configuration was not working properly since the
defaults struct is not deeply copied.
### Testing
Try running commands to change default configuration and either inspect
`config.xml` or `/rest/config` result to see the applied changed.
Example:
```
./syncthing cli config defaults folder versioning params set keep 5
```
### Purpose
As stated in #9489 after clicking on a tab link to switch tabs in a
modal you can no longer close the modal through clicking the ESC key
unless you click anywhere on the modal to focus on it again.
### Testing
- Click on a modal that has tabs like "Settings" or "Add Folder" and
switch tabs then click on ESC.
- Check if clicking outside of a modal in the backdrop should still
close the modal.
### Demo
https://github.com/user-attachments/assets/a010db9a-72f7-4160-a7db-ddfebffb4834
Hazem Krimi