feat(ai): floating-chevron hero + docs link on the account modal

[ndemianc]

Builds on the merged classic account card (#50) — makes the signed-in Manage-account popover dynamic, per the approved direction.

What's new

• Floating-chevron hero. The exact levelcode.ai landing effect: three colored chevrons (#5fb4ff → #7d6bff → #5b3fd6) over four soft "portal" circles that drift up-and-back (portalDrift 7s, transform-origin: 50% 60%, staggered -1.4s per layer). It replaces the plain SD initials as the hero, so the modal moves. Lifted 1:1 from LandingPage.tsx (circles/paths/coords) + globals.css (the drift).
• Premium dialog. Full-bleed hero, 14px radius, soft shadow (0 18px 50px), entrance pop.
• Documentation link → https://levelcode.ai/ai/docs, in a tidy footer beside the Synced line.

Safety / a11y

• The docs link routes through the same fixed allow-list as Terms/Privacy — data-act="docs" → {type:'openExternal', target:'docs'} → openLegal() maps 'docs' → '/ai/docs'. No webview-supplied URL, so the open-redirect guard is intact.
• The hero is decorative (aria-hidden) and the motion honors prefers-reduced-motion (drift + pop both stop).
• Still model-agnostic. Light / One Dark keep the brand palette; high-contrast still defers to editor tokens (from redesign(ai): restyle the signed-in account card to the levelcode.ai classic look #50) — the hero is a decorative brand splash, not text/controls.

Preview

Approved mockup (animated, both themes): https://claude.ai/code/artifact/0c955831-6ce9-444f-95b2-c211b8706e88

Verification

• chat.html scripts parse (0 errors, vm.Script); extension.js node --check clean.
• Full gate 24 suites; the new structure (hero / portal / footer / docs action / reduced-motion) is present.
• A live in-editor render needs the VS Code host, so this is verified against the approved mockup (identical SVG + drift + tokens) + syntax/gate — not a screenshot of the running editor.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates the signed-in Manage-account popover UI in the levelcode-ai webview to match the levelcode.ai landing “portal” hero treatment, and adds a safe Documentation link routed through the extension’s existing allow-listed external navigation.

Changes:

• Replace the classic account card’s initials avatar with a full-bleed, decorative “portal” hero (animated chevrons + drifting circles) and update modal sizing/shadow/radius.
• Add a Documentation footer link in the popover and wire it into the existing openExternal message path.
• Extend the extension-side allow-list mapping (openLegal) to include the docs target (/ai/docs).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
extensions/levelcode-ai/media/chat.html	Adds the portal hero markup/CSS (with reduced-motion guard) and a new docs action/link in the signed-in account card footer.
extensions/levelcode-ai/extension.js	Extends the fixed allow-list in openLegal() to support the new docs target safely.

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