Updates "Section Settings" Side panel UI

[AllanOXDi]

Summary

This PR updates the section title in the edit section UI

Closes #13107

After

Before

References

#13107

Reviewer guidance

1. See https://www.figma.com/design/lVJt5ukOrxS9qay0rXy7GC/0.18-Coach-updates?node-id=107-20607&p=f&t=VBq8IMW8iRQB1p7u-0

2. Navigate to Create quiz

3. Click on the Options button

4. Select the edit section

[github-actions[bot]]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.18.1.dev0_git.20250616162023.pex
Windows Installer (EXE)	kolibri-0.18.1.dev0+git.20250616162023-windows-setup-unsigned.exe
Debian Package	kolibri_0.18.1.dev0+git.20250616162023-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.18.1.dev0+git.20250616162023.dmg
Android Package (APK)	kolibri-0.18.1.dev0+git.20250616162023-0.1.4-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.18.1.dev0+git.20250616162023.zip
TAR file	kolibri-0.18.1.dev0+git.20250616162023.tar.gz
WHL file	kolibri-0.18.1.dev0+git.20250616162023-py2.py3-none-any.whl

[jtamiace]

Agreed, there shouldn't be a border beneath the title section, and there also shouldn't be a border on the bottom bar. I think the border under the title section is currently implemented in different side panels across the app and it'd be good to remove that at some point

[AllanOXDi]

HI @jtamiace does this change looks good to you?

[marcellamaki]

As a secondary thought - if you run into challenges with this (updating the CSS styles, the title/header patterns, etc.), this is really useful information for our side panel refactoring work! You can share that as part of our conversations

[marcellamaki]

The underline should be removed, it's part of the spec (see above). I think we have some further side panel cleanup here to do for consistency, but I don't think that's in scope for @AllanOXDi 's PR here. I will need to think then if we should merge this now for 0.18 patch 2 and have it not match, or if we should merge this into develop and do all of the cleanup in 0.19