a11y | A23 contain sidebar resizer in landmark

[BrianGenisio]

Summary

Closes #73 (A23). #sidebarResizer sat between <aside> and <main>, so axe reported region: 1 on empty-state in both themes. The separator now lives inside the sidebar landmark.

Changes

• Move the resizer to the end of <aside> and pin it to the right edge with absolute positioning. Drag math (clientX vs sidebar left) and arrow-key nudging are unchanged.
• Empty-state axe baseline is now {} in light and dark. Settings scans were already clean.
• DOM test asserts the separator is contained by #sidebar.

Test plan

• npm test
• A11Y_CI=1 axe run: empty-state region: 0 both themes; baseline updated
• Pointer: drag the grip; width persists after reload
• Keyboard: Tab to the separator, ArrowLeft / ArrowRight, double-click reset
• Light and dark grip visibility

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📥 Commits

Reviewing files that changed from the base of the PR and between 3d2deab and a0411cd.

📒 Files selected for processing (5)

• a11y-audits/8-5-26/wave-4-plan.md
• a11y-audits/tools/baseline.json
• public/app.css
• public/index.html
• tests/dom/render.test.js

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