QA review tooltip + comment improvements

[SuaYoo]

Resolves #1761

Changes

• Switches QA review page chip tooltip colors to dark text on light background
• Shows newest comment when hovering over comment cell in QA tab page list to match tooltip in QA review page list
• Validates textarea max entry for description and comments

Manual testing

1. Log in as crawler
2. Select to reviewed archived item with page comments
3. Go to QA tab
4. Hover over comment icon in "Pages" table. Verify tooltip with latest comment is shown
5. Click page to go into review
6. Hover over page heuristic preview chip. Verify tooltip renders dark-on-light
7. Click page comment button to open comment dialog
8. Enter text. Verify max length text help updates as expected
9. Try to save with over max length. Verify you're prevented from saving
10. Limit text to max length. Verify you're able to save
11. Repeat 8-10 for review description

Screenshots

Page	Image/video
Archived Item Detail - QA - Pages	Short comment: Long comment:
Archived Item - QA Review - Page comment dialog
Archived Item - QA Review - Item review dialog
Archived Item - QA Review - Page heuristic chip tooltip

[emma-sg]

From Discord: we've hidden arrows here because properly doing arrows with borders would likely require forking shoelace's tooltip element — we'll maybe come back to this later?