[CharInv] Migrate from deprecations

[imnasnainaec]

Parts of #3180, #3879

Notes for review:

• In most places, replaced <Grid> with <Grid2>, <Stack>, <div>, or nothing, as fit the design need.
• Moved Save and Cancel buttons from bottom of CharInv into child component CharacterEntry at top

Notes for testing:

• 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)
• To test CharInvCompleted, go to Data Cleanup > Create Character Inventory, click on any character tile with multiple occurrences, do a Find & Replace, then doing so with another character, then change the status on several character, then click Save, then back in Data Cleanup click on the newest tile under "You've completed:"
• Test with a few different UI languages

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Currently on QA, you have to scroll to the bottom to see the Save/Cancel buttons:

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This pr moves the Save/Cancel buttons up next to the "Advanced" option:

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.11%. Comparing base (b518748) to head (6ea8e21).
⚠️ Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
...oals/CharacterInventory/CharInv/CharacterEntry.tsx	77.77%	4 Missing ⚠️
...CharacterInventory/CharInv/CharacterList/index.tsx	50.00%	2 Missing ⚠️
src/goals/CharacterInventory/CharInv/index.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3885      +/-   ##
==========================================
- Coverage   74.12%   74.11%   -0.02%     
==========================================
  Files         288      288              
  Lines       10620    10615       -5     
  Branches     1327     1327              
==========================================
- Hits         7872     7867       -5     
  Misses       2362     2362              
  Partials      386      386              

Flag	Coverage Δ
backend	85.43% <ø> (ø)
frontend	65.50% <75.00%> (-0.03%)	⬇️

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[jasonleenaylor]

Reviewed 7 of 8 files at r1, 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)