…#70061)

This reverts commit f8bc43f.

* temporarily add colliding level names to nontransactional setup_all blocks

* use transactional test case whenever we use setup_all

* fix timeout issue with BackpacksControllerTest

* revert temporary colliding level names

* rerun drone

* trying to set up

* not working

* get preview sw plumbed up

* checkpoint

* register active worker

* use current file

* fix received source handler

* experiment with base tag

* remove errant characters

* serve urls

* Serve service worker JS from / so it can control the root scope

* Define weblab2_project_service_worker as a webpack entry point (doesn't work! entry point never runs, wtf webpack)

* Service worker works/serves on /!!!

* remove entrypoint

* put things at the root, external http requests do not work

* update src

* channel idea

* go back to regular method

* ignore pre-determined files

* wip

* add additional font file

* auto refresh

* start setting up broadcast channel

* move more messages to broadcast channel

* use broadcast channel everywhere

* start of 404 page

* remove ignore list

* make nice not found page

* update css links

* fix infinite loop for /

* update comment

* don't send blank source, it gets confused

* fix different page bug

* updates

* todos

* hide preview while loading

* remove duplicate entrypoint

* add flag and remove logs

* comments and clean up

* reset service worker state on load

* more clean up

* more clean up

* post message to service worker directly

* add keep-alive message

* decrease keep alive interval

* undo unrelated changes and add todo

* remove unused message type

* address copilot comments

* WIP weblab2: allow ${channelId}.preview.codeprojects.org subdomains for projects

* make channel id lowercase

* Fix cloudformation error: go all in on *.preview approach

* poke ci

* poke ci

* Remove last vestiges of non-wildcard preview. domains

* remove console log

* fix level switching bug

* skip test for now

* fix assumption about port

* add local flag

* add comment

* update comment

* unregister sw on unload

* remove underscores from channel id

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Co-authored-by: Molly Moen <molly@code.org>

…lity (#70058)

* wrap card in link for better accessiblity

* fix failing tests