docs: record automated smoke results for the network spinner

[razinkele]

Post-merge validation of the network loading spinner (#11). Annotates the smoke checklist with programmatically-verified results (Chromium via Playwright, forcing is-loading and reading computed styles/geometry):

• Spinner shows + clears in both apps; veil fully covers the canvas (outputCoversCanvas: true).
• MosaicSES's separate skin copy carries the CSS (::before resolves in that app).
• Reduced-motion → no ring rotation.
• Modal z-order → spinner (5/6) below the fork modal (1000).
• Dark theme (deep-ocean) → legible (dark label on the always-light canvas/veil).

Docs-only; no code change. Interaction-dependent items (leverage re-show, compartment drill-in, node-modal click) left for a manual pass.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between c958a88 and 1c34136.

📒 Files selected for processing (1)

• docs/2026-07-02-network-spinner-smoke-checklist.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/spinner-smoke-results

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