Integrate shopping cart into lesson resource selection side panel

[AlexVelezLl]

Summary

• Integrates shopping cart into lesson resource selection side panel.
• Implemts functionality to add selected resources to lesson.
• Adds a guard to show a closing confirmation modal when closing the modal with modified changes.

Compartir.pantalla.-.2025-01-13.16_12_02.mp4

References

Closes #12990.

Reviewer guidance

• Create or edit a lesson
• Change browser route path from "/lesson" to "lessontemp".
• Select/deselect resources to add to the lesson.
• Check the shopping cart, its reactiveness, buttons, etc.
• Check that save button works in different scenarios.

Implementation notes

As we shouldnt have repeated resources in a lesson, I have make sure to save unique resoures in the list. This implies that if a user is selecting a resource that is already in the lesson, it will just "ignore" it (because of the unification process). So it wont take it into account to make the save request, neither to show the close confirmation message if no new resources are being added. Does this makes sense?

[AlexVelezLl]

This isnt actually a completely new file, this was moved from https://github.com/learningequality/kolibri/pull/12996/files#diff-31fd90e627499b35b0a5e2f15e2b3fb570cb32543799343fd4549daf91bbe2a4

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.18.0a0.dev0_git.333.gdbf5bf14.pex
Windows Installer (EXE)	kolibri-0.18.0a0.dev0+git.333.gdbf5bf14-windows-setup-unsigned.exe
Debian Package	kolibri_0.18.0a0.dev0+git.333.gdbf5bf14-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.18.0a0.dev0+git.333.gdbf5bf14.dmg
Android Package (APK)	kolibri-0.18.0a0.dev0+git.333.gdbf5bf14-0.1.4-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.18.0a0.dev0+git.333.gdbf5bf14.zip
TAR file	kolibri-0.18.0a0.dev0+git.333.gdbf5bf14.tar.gz
WHL file	kolibri-0.18.0a0.dev0+git.333.gdbf5bf14-py2.py3-none-any.whl