ui: restore a 50px top header with centered brand; rename to CoRE.Vizion+
Re-add the top header as a 50px bar injected by ensureHeader() on every layout page (skipped on login), with the brand centered. The layout height now subtracts both header and footer. Rebrand the project CoRE.Vision → CoRE.Vizion+ everywhere: header + footer brand, all page <title>s, the login card, and the FastAPI OpenAPI title (applies on next backend restart). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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