Allow dropdown inputs to be manually enabled for DnD questions for accessibility

[sjd210]

Adds an accessibility setting to "Enable non-dragging alternative inputs". For now this only affects cloze/drag-and-drop questions, but is defined broadly enough that we can use the same setting for other inputs in the future if they apply (e.g. depending on how we implement reorder question accessibility).

Also adds a Dropdown/Drag and drop override toggle to all question and quiz pages containing these input types in the top right, equivalent to the context switcher on concept pages. The toggle is defaulted to Dropdown if the user has enabled the accessibility setting or is on a mobile device, and Drag and drop otherwise. If manually toggled, this overrides all other settings and the toggled input mode is enabled instead (e.g. allowing drag and drop at xs screens, if wanted).

I'm not 100% confident on things like:

• if we should hide the toggle for logged-in users with the new setting disabled (so they'd see no external change)
• the exact placement of these toggles - there could be an option to hide it? or we could add it to the sidebar instead? 🤷‍♀️

Thoughts welcome!

Also requires https://github.com/isaacphysics/isaac-sops-config/pull/22 for new accessibility setting to work. Merged!

---

Known problem: If a question is using dropdowns on first page load, then the first time drag and drop is switched to the dropzones will not load properly. This is a pre-existing issue (try some incremental page width changes on a live question) but is surfaced a lot more heavily here. This is sure to be some portalling shenanigans, and I don't think we should merge this without fixing it, but the rest is ready to review now.

[codecov]

Codecov Report

❌ Patch coverage is 57.89474% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.81%. Comparing base (3ebccb7) to head (aec330f).
⚠️ Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
...pp/components/content/IsaacDragAndDropQuestion.tsx	23.07%	10 Missing ⚠️
src/app/components/content/IsaacClozeQuestion.tsx	0.00%	3 Missing ⚠️
src/app/components/elements/PageMetadata.tsx	76.92%	3 Missing ⚠️
...onents/elements/markup/portals/InlineDropZones.tsx	0.00%	2 Missing ⚠️
...ents/elements/panels/UserAccessibilitySettings.tsx	33.33%	2 Missing ⚠️
src/app/state/reducers/userState.ts	75.00%	2 Missing ⚠️
...components/elements/quiz/QuizContentsComponent.tsx	88.88%	1 Missing ⚠️
src/app/state/selectors.tsx	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2159      +/-   ##
==========================================
+ Coverage   43.75%   43.81%   +0.06%     
==========================================
  Files         593      594       +1     
  Lines       25036    25085      +49     
  Branches     7427     8330     +903     
==========================================
+ Hits        10954    10992      +38     
- Misses      14032    14044      +12     
+ Partials       50       49       -1     

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