feat: add frontend-base sibling alongside legacy FPF plugin

[arbrandes]

Description

Adds frontend-app-sample/ alongside the existing frontend-plugin-sample/. The former does the same thing as the latter, but for the frontend-base version of Learner Dashboard.

tutor-contrib-sample registers both. The operator picks which one actually fires by enabling (or not) the frontend-base learner-dashboard app in tutor-mfe's FRONTEND_APPS filter.

Note that one of the README's links out to openedx/docs.openedx.org#1459, which hasn't merged yet.

How to test

Install tutor-contrib-sample from this repo and enable it as usual. Then enable the frontend-base version of Learner Dashboard by adding a tiny standalone Tutor plugin that flips the toggle:

# "$(tutor plugins printroot)"/fb-learner-dashboard.pyfromtutormfe.hooksimportFRONTEND_APPS@FRONTEND_APPS.add()def_enable_learner_dashboard(apps):
apps["learner-dashboard"]["enabled"] =Truereturnapps

Enable it:

tutor plugins enable fb-learner-dashboard

Now bind-mount frontend-app-sample/. This is required because it's not yet published to NPM:

tutor mounts add /path/to/sample-plugin/frontend-app-sample

Launch:

tutor dev launch

The frontend-base site should pick up the slot operation from @openedx/frontend-app-sample. The Archive/Unarchive buttons should now render via the new path on the frontend-base learner dashboard at http://apps.local.openedx.io:8080/learner-dashboard/ (note the 8080 port that tells it apart from the legacy version at port 1996).

Behind the scenes, tutor-mfe auto-detects the frontend-app- prefix and mounts it as a workspace package under packages/frontend-app-sample in the mfe-dev container, so edits hot-reload without rebuilds. You can check with:

tutor dev logs -f mfe-dev

LLM usage notice

Built with assistance from Claude.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.04%. Comparing base (00aa944) to head (b9679b8).

Additional details and impacted files

@@ Coverage Diff @@## main #45 +/- ##
=======================================
Coverage 93.04% 93.04% =======================================
Files 16 16 Lines 503 503 Branches 18 18 =======================================
Hits 468 468 Misses 24 24 Partials 11 11 

Flag	Coverage Δ
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