Scale back to the add button's margin centering

[imnasnainaec]

Scales #214 back to the one change in it that stands on its own, now that the upstream fix it was working around has landed and been built.

paranext/paranext-core#2667 moved the platform Button's press nudge off the shared --tw-translate-y custom property onto transform. Verified it is consumable, not just merged:

• ff22ea69aa9 is an ancestor of paranext-core main
• the committed lib/platform-bible-react/dist was rebuilt after it (238ace491d3, 779ab347d27, 35a09c06276), and the live class in both the ESM and CJS bundles is now tw:active:not-aria-[haspopup]:transform-[translateY(1px)]
• this repo resolves platform-bible-react as a lockfile link to ../paranext-core/lib/platform-bible-react, so there is no version to bump — pulling paranext-core main is enough

The browser applies translate before transform, so a caller's -translate-x-1/2 -translate-y-1/2 composes with the nudge instead of replacing it. Translate-centering a platform Button is correct again.

What's kept

Centering the suggestion "+" by margin inside an inset-y-0 box, in TokenChip.tsx, plus a test for it. This one earns its place independent of the bug it was written for:

• it keeps centering out of the transform channel entirely, so it can't be re-broken by a future Button variant, animation utility, or anything else that writes translate — #2667 only moved the current nudge, and the Button still carries tw:transition-all
• it drops a percentage translate resolved against a containing block whose height needn't be an even number of pixels, on a 10px icon sitting against the input border

What's dropped

• The arc split button (ArcOverlay.tsx) and its test, back to what main had. Keep icon buttons centered while pressed #214 centered it with an inline style transform, which #2667's own note lists among the things that still override the nudge — so that button would have silently lost its press feedback.
• Both not.toMatch(/translate/) assertions. Their premise — that a translate utility on a platform Button is unsafe — is no longer true, and the assertion would forbid an approach that is now fine. The invariant lives upstream in button.test.tsx, where it covers every caller rather than these two.

Test plan

• npx jest — 63 suites, 1785 tests pass
• npm run lint — eslint, stylelint, tsc --noEmit, dependency scope all clean
• Not verified by hand in the running app; the centering swap is like-for-like (the containing block is the tw:relative span, and the button has a definite h-2.5), but a visual check of the "+" against the gloss input border is worth doing before this comes out of draft.

Follow-ups

• Keep icon buttons centered while pressed #214 and Fix centered icon buttons swallowing their own clicks #236 can both close unmerged — Keep icon buttons centered while pressed #214's remainder is here, and Fix centered icon buttons swallowing their own clicks #236 was the same workaround with no test.
• When the + for the suggestions dropdown is clicked, it moves #202 closes against paranext-core#2667, which is what actually fixes the reported symptom. This PR is a durability change, not the fix.

Branched from 202-suggestion-add-button-jumps (rebased onto main) so @alex-rawlings-yyc's commit keeps its attribution; the scale-back is the commit on top.

🤖 Generated with Claude Code

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This change is 

Summary by CodeRabbit

• Style

  • Improved the vertical alignment of the suggestion “+” button within gloss fields.
  • Preserved the button’s existing appearance and visibility behavior.

• Tests

  • Added coverage to verify the button remains vertically centered.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 01ebd514-9b45-4a6e-97b8-303c7c32afdd

📥 Commits

Reviewing files that changed from the base of the PR and between b9e9d80 and 678972f.

📒 Files selected for processing (2)

• src/__tests__/components/TokenChip.suggestions.test.tsx
• src/components/TokenChip.tsx

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📝 Walkthrough

Walkthrough

The TokenChip suggestion-add button now centers vertically with automatic margins. A test verifies the new styling.

Changes

TokenChip suggestion centering

Layer / File(s)	Summary
Suggestion button centering src/components/TokenChip.tsx, src/__tests__/components/TokenChip.suggestions.test.tsx	The button uses full vertical insets and automatic margins instead of translated top positioning. The test verifies the centering styles.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 67897

This is a localized change to center the suggestion button by margin and update its test coverage; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: alex-rawlings-yyc

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes scaling back changes while retaining margin-based centering for the add button, which matches the main pull request objective.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 202-center-add-button-by-margin

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[alex-rawlings-yyc]

@alex-rawlings-yyc reviewed 2 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on imnasnainaec).