Add a shadcn-style Tooltip prototype

Campaign: v0-good-first-issues Seed id: shadcn-tooltip-prototype

Summary

Build a shadcn-style Tooltip prototype on top of the base Tooltip work.

Scope

• Add the shadcn-facing Tooltip prototype after the base Tooltip API is available.
• Match existing shadcn style conventions; use shadcn Hover Card/Dialog as trigger/content styling references.
• Add a minimal trigger/content demo.

Acceptance criteria

• The demo shows the tooltip opening from an interactive trigger.
• The implementation keeps positioning expectations modest and documented.
• The docs link back to the base Tooltip prototype.

References

• packages/prototypes/shadcn/src/hover-card/root.ts
• packages/prototypes/shadcn/src/hover-card/trigger.ts
• packages/prototypes/shadcn/src/hover-card/content.ts
• packages/prototypes/shadcn/test/hover-card.test.ts
• packages/prototypes/shadcn/src/dialog/trigger.ts
• packages/prototypes/shadcn/src/dialog/content.ts
• packages/prototypes/shadcn/test/dialog.test.ts
• apps/www/src/content/docs/en/ui-libraries/shadcn
• internal/issues/v0-good-first-issues.json#base-tooltip-prototype

Out of scope

• A full floating-ui integration.
• HoverCard behavior.

Maintainer notes

Category: prototype Difficulty: small