Align Studio with the shared AlvenX brand system

[AlbertXXuu]

Problem and outcome

OpenMultimodalLab still mixed the product lockup with the canonical wordmark and treated the Studio wordmark as static. This change gives the README and Studio the shared AlvenX identity, keeps MULTIMODAL EVIDENCE as separate text, and makes the header wordmark an accessible return-to-top control that preserves the current URL, browser history, selected view, inputs, and results. Studio status surfaces now stay within the approved blue, indigo, violet, and slate palette.

Scope

• Replace the README and packaged header asset with the canonical subtitle-free wordmark.
• Preserve the former project lockup for the unchanged social preview and make its Windows rebuild path deterministic.
• Add the native header home control, responsive styling, documentation, and a real Chromium interaction test.
• Install Playwright Chromium in the Studio CI job so the browser test cannot silently skip.
• No benchmark evidence, model configuration, package API, schema, or version changes.

Evidence

• Python 3.13 full suite: 204 tests passed, 3 documented optional/Windows skips; the new Chromium test executed.
• Python 3.11 full suite: 204 tests passed, 2 documented skips.
• Targeted Studio and social-preview suite: 29 tests passed, 2 documented skips; Chromium interaction test executed.
• Repository audit: 196 text files, 283 Markdown links, and 1056 JSON/JSONL documents passed.
• Contributor smoke: PASS, 3 of 3 records successful with the socket network guard enforced.
• Verified report bundle: 4 sources and 5 outputs.
• Runtime license policy: PASS.
• Wheel built and passed a fresh Python 3.11 install, doctor, mock run, and report outside the checkout.
• Shared brand validation: 22 hashed assets, 5 unified README headers, and 5 header navigation contracts passed.
• Workspace validation passed for all 5 repositories.
• Rebuilt social preview SHA-256 matches the committed PNG: f44b868678f4b64a598666fd4f383f7025d2bcec3a7b0aa2334bef093e49f7c0.

Compatibility and risk

The Studio behavior change is limited to the wordmark control and approved palette tokens. The browser test adds a Chromium download to the Studio CI job. The social-preview builder disables the Chromium sandbox only while rendering its generated local file with embedded assets; it does not navigate to remote content.

Checklist

• The change is focused and does not include unrelated files.
• New behavior has automated tests or a documented reason it cannot.
• Core tests pass on a supported Python version.
• python scripts/check_repository.py passes.
• User-visible commands and behavior are documented.
• Model, data, media, and dependency licenses are documented when relevant.
• No secrets, private media, model weights, raw runs, or personal paths are committed.
• Mock results are not presented as real-model capability.
• Experiment numbers link to raw evidence and state their limitations.