Document pg up/down on mac

[lawsie]

Summary

Page Up and Page Down keys don't exist on Mac. Add a modifier in the keyboard controls documentation to document the correct keys on Mac.

AI usage

Claude Sonnet 5 was my wingman today but all it really did was write the line, I did everything else.

Summary by CodeRabbit

• Bug Fixes
  • Updated shortcut instructions to display the correct Page Up/Page Down key labels based on the user’s platform.
  • macOS now shows Fn + ↑ ↓, while other platforms show PgUp PgDn.

[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: 4ec1d912-7bac-4345-b76b-272174208fe9

📥 Commits

Reviewing files that changed from the base of the PR and between e0d499b and ee41d49.

📒 Files selected for processing (1)

• accessibility/keyboardui.js

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📝 Walkthrough

Walkthrough

The keyboard shortcut display now shows Fn + ↑ ↓ on Mac and PgUp PgDn on other platforms. The 3D transform shortcut uses the platform-specific label.

Changes

Shortcut label rendering

Layer / File(s)	Summary
Platform-specific page-navigation shortcut accessibility/keyboardui.js	Defines the platform-specific pgUpDn label and uses it in the 3D transform shortcut display.

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

Suggested reviewers: tracygardner

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: documenting Mac equivalents for Page Up and Page Down.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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