[WordCard, goals] Migrate from deprecated Grid

[imnasnainaec]

Part of #3787

Notes for review:

• In most places, replaced <Grid> with <Grid2>, <Stack>, <Box>, <div>, or nothing, as fit the design need.
• <Stack direction="row"> can be used in place of <Grid2> when we don't want the items in the row to wrap to a second row in a narrow window
• Moved Save and Cancel buttons from bottom of CharInv into child component CharacterEntry at top
• Do a side-by-side visual comparison between this and master (on QA) to make sure appearance is (roughly) the same or (subjectively) improved on all edited components
• Try each edited component with various window widths > 350px (we don't support narrower than that)
• Test *Completed components by clicking a completed goal tile in Data Cleanup under "You've completed:"
  • For MergeDupsCompleted, first go to Data Cleanup > Merge Duplicates, and merge and/or delete words in various combinations
  • For WordCard and ReviewEntriesCompleted, first go to Data Cleanup > Review Entries and edit several entries, including adding multiple semantic domains to a sense
• Test with a few different UI languages

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This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 56.89655% with 25 lines in your changes missing coverage. Please review.

Project coverage is 65.99%. Comparing base (15b0b4c) to head (678602d).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
...oals/CharacterInventory/CharInv/CharacterEntry.tsx	77.77%	4 Missing ⚠️
...riesTable/Cells/EditCell/EditSensesCardContent.tsx	33.33%	4 Missing ⚠️
src/components/Buttons/UndoButton.tsx	25.00%	3 Missing ⚠️
...CharacterInventory/CharInv/CharacterList/index.tsx	50.00%	2 Missing ⚠️
src/goals/MergeDuplicates/MergeDupsCompleted.tsx	60.00%	2 Missing ⚠️
...geDuplicates/MergeDupsStep/MergeDragDrop/index.tsx	50.00%	2 Missing ⚠️
src/goals/ReviewEntries/ReviewEntriesCompleted.tsx	0.00%	2 Missing ⚠️
...s/ReviewEntriesTable/Cells/EditCell/EditDialog.tsx	60.00%	2 Missing ⚠️
...iewEntriesTable/Cells/EditCell/EditSenseDialog.tsx	0.00%	2 Missing ⚠️
src/goals/CharacterInventory/CharInv/index.tsx	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3879      +/-   ##
==========================================
- Coverage   74.53%   65.99%   -8.55%     
==========================================
  Files         287      236      -51     
  Lines       10670     6060    -4610     
  Branches     1326      762     -564     
==========================================
- Hits         7953     3999    -3954     
+ Misses       2334     1813     -521     
+ Partials      383      248     -135     

Flag	Coverage Δ
backend	?
frontend	65.99% <56.89%> (-0.09%)	⬇️

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