fix(table): avoid arrow caret flash

[hhhjin]

Summary

Plain ArrowUp / ArrowDown navigation in table cells could briefly flash the native caret before the selection moved to the adjacent cell.

Issue:

Screen.Recording.2026-03-29.at.21.00.54.mov

Previous flow:

• overrideSelectionFromCell watched for the browser selection update
• once the new selection left the current cell, it scheduled moveSelectionFromCell in a setTimeout
• that corrected the final selection after native caret movement had already painted
• result: the final selection was right, but an intermediate caret flash could still appear

Updated flow:

• plain collapsed vertical table navigation is handled earlier in withTable.moveLine
• when the caret is still able to move within the current cell, native vertical movement is preserved
• once the caret reaches the visual first or last line, moveSelectionFromCell moves selection to the adjacent cell
• result: table navigation is resolved before native caret motion can paint the intermediate flash

Behavior covered by the new path:

• multi-block cells
• soft-break cells
• soft-wrapped single-block cells

What stays the same:

• overrideSelectionFromCell still handles shift-based table selection expansion
• moveSelectionFromCell remains the transform that performs the actual cross-cell move

Testing

• pnpm install --ignore-scripts
• pnpm turbo build --filter=./packages/table
• pnpm turbo typecheck --filter=./packages/table
• pnpm lint:fix
• bun test packages/table/src/lib

Checklist

• pnpm typecheck
• pnpm lint:fix
• bun test
• pnpm brl
• pnpm changeset
• ui changelog

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[changeset-bot]

🦋 Changeset detected

Latest commit: 42eeb13

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@platejs/table	Patch
@platejs/ai	Patch
@platejs/csv	Patch

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Project	Deployment	Actions	Updated (UTC)
plate	Ready	Preview, Comment	Mar 29, 2026 11:30pm

[zbeyens]

Awesome, we were blocked on this one before Codex.
Note I did an update to task skill. Aiming best one-shot PRs with dev-browser and TDD.