chore: remove redux from package.json, update comments

[brian-smith-tcril]

Summary

Removes the redux packages now that no learning code uses them: #2168 removed the last store. Closes #2018, the last layer of its stack (above #2168, which is above #2164). Part of #1946.

What changed

Three commits, to keep each lock diff readable:

1. Regenerate package-lock.json from scratch (wipe the lock and node_modules, npm install, npm dedupe as chore: regenerate package-lock.json #2042 did) with package.json unchanged, so the diff is only the current ranges resolving to newer versions.
2. Remove @reduxjs/toolkit, react-redux, redux and reselect (the selector library, whose last import went in refactor: make the courseware redirects declarative and drop their fire-once guards #2146) from package.json and regenerate the same way. @types/react and @types/react-dom ^18 join devDependencies, as in frontend-template-application and frontend-app-authoring: without learning's own react-redux 7, a fresh install failed with ERESOLVE on @types/react 18 vs 19 (decision 4).
3. Remove or reword the comments that point readers at Redux in src; the plugin-overrides migration guide stays.

redux and react-redux remain in the tree only as frontend-platform's peers and frontend-plugin-framework's dependencies (one copy each), until the frontend-base port (#1905).

Testing

• npm run lint and npm run types clean; npm test: 124 suites, 1,279 tests; npm run build compiles with webpack's two usual asset-size warnings.
• npm ls @reduxjs/toolkit is empty.

Decisions

Every choice in this layer, with the reasons:

Full decision log

Decisions — remove the redux packages (#2018)

Layer 3 of the #2018 stack, above #2168 (which adopted
@edx/frontend-lib-special-exams 5.0.0 and removed learning's redux
store); closes #2018. This is the library-gated dependency removal #1978
described and handed to #2018 when #1977 closed it. Settled 2026-10-14.

1. Two lock regenerations, each from scratch. Both wipe
   package-lock.json and node_modules, run npm install, then
   npm dedupe (as chore: regenerate package-lock.json #2042 did). The first runs with package.json
   unchanged and is committed alone, so its diff is only the current
   ranges resolving to newer versions: 132 version changes, one major
   (ajv-formats 2 to 3, under copy-webpack-plugin's schema-utils).
   Without dedupe a fresh install hoists react-intl 10 (Paragon's peer
   range allows it), which is ESM-only and fails Jest, and @types/node
   26, which fails types; with dedupe the tree keeps react-intl 6.8.9 and
   @types/node 22 and no pins are needed. The second regeneration
   carries the removals, so its lock diff is only what they cause (plus
   electron-to-chromium 1.5.455 to 1.5.456, released between the two).
2. What leaves package.json: @reduxjs/toolkit, react-redux and
   redux, which no learning code imports since refactor!: adopt frontend-lib-special-exams v5 and drop the redux store #2168, and reselect,
   the selector library used with them, whose last import went in refactor: make the courseware redirects declarative and drop their fire-once guards #2146.
   @reduxjs/toolkit, redux-thunk, @types/react-redux and reselect
   leave the tree.
3. What still pulls redux in. Only frontend-platform (required peers:
   redux ^4.0.4, react-redux ^7.1.1 || ^8.1.1) and
   frontend-plugin-framework (dependencies: redux 4.2.1, react-redux
   8.1.1). npm satisfies both with one root copy each, react-redux 8.1.1
   and redux 4.2.1, which replaces learning's react-redux 7.2.9 and
   frontend-plugin-framework's nested copy. Both packages stay through the
   frontend-base port (Convert Learning to frontend-base #1905), which is when they leave.
4. @types/react and @types/react-dom ^18 join devDependencies.
   Without learning's own react-redux 7.2.9 (whose only peer is
   react), npm places frontend-platform's react-redux 8 peer at the
   root. Its optional @types/react peer (^16.8 || ^17.0 || ^18.0)
   applies to the root @types/react, which learning has as 18.3.31
   through react-intl, react-bootstrap and uncontrollable.
   @testing-library/react's optional @types/react-dom peer then
   resolved to 19.3.0, whose @types/react ^19.3.0 peer needs that same
   root copy to be 19, and a fresh install stopped with ERESOLVE. Learning
   listed neither type package; the org's React 18 apps list both:
   frontend-template-application, frontend-base and frontend-app-authoring
   (as devDependencies: ^18, frontend-base ^18.3.20 and ^18.3.6), and the
   frontend-base apps account, profile, instructor-dashboard and
   admin-console. Learning follows the template's spelling. No frontend-platform
   app had dropped its own react-redux before, which is why none hit
   this. The two go in the removal commit, not the first regeneration,
   because only the removal needs them; no overrides.
5. Comments that point at Redux go (a third commit):
   GoalUnsubscribe.jsx's "don't need to bother with redux" note,
   TourContext.tsx's "mirrors the former tours Redux slice" note, the
   "former end-tour thunks" parenthetical in ProductTours.jsx, and the
   "old reducer … immer" note in apiHooks.test.tsx (the test name
   already says what it checks) are removed. SequenceNavigation.test.jsx's
   TODO still holds (UnitButton prefers the cached unit's contentType
   over the "lock" fallback), so only its source changes, from Redux to
   useUnit.
6. Kept: the "Migrating from the Redux plugin store" section of
   src/generic/plugin-overrides/README.md, for plugins that still
   dispatch to the old store, and ADRs 0004 (model store), 0006 (thunk
   naming) and 0007 (testing, Draft), as history. No learning ADR for
   React Query: OEP-67 frontend ADR 0010 ("React Query") is the
   org-level decision.
7. No !. Nothing consumer-facing changes beyond refactor!: adopt frontend-lib-special-exams v5 and drop the redux store #2168's break,
   where plugins lost the store.
8. Verification (at the layer's head): lint and types clean; 124
   suites, 1,279 tests pass; npm run build compiles with webpack's two
   usual asset-size warnings; npm ls @reduxjs/toolkit is empty.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.16%. Comparing base (9c7d31d) to head (dfffb5a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2180      +/-   ##
==========================================
+ Coverage   95.85%   96.16%   +0.31%     
==========================================
  Files         373      373              
  Lines        6146     6025     -121     
  Branches     1516     1480      -36     
==========================================
- Hits         5891     5794      -97     
+ Misses        246      222      -24     
  Partials        9        9              

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[arbrandes]

See ya, Redux! 🥳