fix(code-xr): lead with the narrative, sharpen what Code-XR is

[aMonteSl]

Two follow-ups on the v1.2.0 update.

The narrative goes first

ProjectDetailLayout now renders the release section after the narrative block instead of before it. The page reads hero → what the project is and how it got here → what 1.2.0 brought, which is the order a reader needs. "Versions & milestones" sitting immediately above "What's new in v1.2.0" also hands off well.

A better definition of Code-XR

The hero's featured card said "VS Code extension for XR visualization of software metrics" — that names a category, not a product, and it predates 1.2.0. Both places that define Code-XR now lead with the same concrete idea, taken from the extension's own pitch:

• Hero card: "VS Code extension that turns your codebase into a 3D city you can walk through, live as you edit" (still fits the card's two-line clamp in both languages).
• Project summary (project card, detail hero, and the SEO meta description): opens with the 3D city you walk through in your browser, says it keeps updating as you edit, and adds that no headset is needed although it works in VR — then the four analyses of 1.2.0.

Verification

npm run check and npm run build pass. Block order confirmed in the static export for both locales, the flip cards still work, and there are no console errors on a clean dev server.

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