Use uploaded brand logo assets in design system previews

[mturac]

Summary

• mirror logo-like uploads from project assets into logos before preview and finalize adoption
• prefer real wordmark/logotype names when filling an empty logo slot while keeping explicit logo path resolution extension-first
• add regression coverage for preview/finalize mirroring, dedupe, collision bounds, and ranking

Fixes #5913

Surface area

• Brand extraction previews
• Logo asset adoption and finalization
• Logo ranking regression coverage
• Database or migrations
• Public API contract changes

Validation

• Regression coverage verifies empty-logo adoption now prefers wordmark/logotype-like filenames when supported extensions tie.
• pnpm --dir apps/daemon exec vitest run -c vitest.config.ts tests/logo-priority.test.ts tests/brand-extraction-engine.test.ts
• pnpm --filter @open-design/daemon typecheck
• git diff --check

[lefarcen]

Thanks — the regression scope is clear from the summary and linked issue.

Two quick housekeeping items before pool review scopes this cleanly:

• please add the Surface area checklist
• please add a short Validation section with what you actually ran / verified

Also marking this for QA validation because this changes the brand preview/logo adoption path that users see. Nothing needed from you right now — we’ll follow up here once it reaches QA.