[codex] Update wiki MemBerry branding

[AP3X-Dev]

Summary

• Replace the wiki header badge with the MemBerry logo asset and split-color MemBerry wordmark.
• Shift wiki accent styling from yellow to MemBerry purple, including generated project graph styling.
• Add an animated purple aurora hero background with a left-side dark scrim and keep the previous hero background as a fallback token.
• Serve the logo through the wiki viewer and cover the header/logo/hero tokens in viewer tests.

Validation

• npm test --workspace @memberry/wiki
• npm run build --workspace @memberry/wiki
• Live smoke check on http://192.168.0.25:3200/wiki/_index after restarting the local wiki viewer.

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch codex/wiki-branding-hero

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