[feat]: Update `<pf-v6-tooltip>` for PatternFly v6

Summary

Update `` to implement the PatternFly v6 Tooltip component.

Text popup on hover/focus for supplementary information, with configurable position and delay.

Prior Art

Requirements

• MUST implement PFv6 visual designs
• MUST provide end-user feature parity with `@patternfly/react-core` Tooltip
• MAY adjust element API to leverage web platform strengths
• SHOULD maintain CSS custom property theming compatibility
• SHOULD expose useful CSS shadow parts

Element-specific considerations

• Uses Floating UI for positioning; already a v5 dep - verify version bump needed for v6
• React `position`: `top`, `bottom`, `left`, `right`, `top-start`, `top-end`, etc. (12 values)
• React `trigger`: space-separated string, e.g. `"mouseenter focus"` - map to `trigger` attribute
• React `entryDelay`, `exitDelay` (ms) - map to attributes
• React `distance` (offset from target) - CSS custom property preferred
• React `flipBehavior` - Floating UI flip middleware options
• React `maxWidth` - CSS custom property preferred
• React `reference` prop (programmatic trigger target) - consider `for` attribute pattern (like ``)
• Tooltip MUST NOT receive focus itself (content only); trigger element holds focus

Checklist

Rename

• Delete `elements/pf-v5-tooltip/`
• Update `elements/package.json` exports
• Update `eslint.config.js` ignore globs if applicable
• Update docs `_snippets/` and `framework-integration/` references

Implementation

• API per `.claude/ADVICE.md`
• CSS uses v6 tokens, logical properties, nesting
• `@summary` and JSDoc on element class

Demos

• Demos match patternfly.org naming/structure
• CSS custom properties match computed styles from patternfly.org (Chrome MCP)
• Visual parity verified via Chrome MCP

Tests

• Public API covered (attributes, properties, events, slots)
• `a11ySnapshot` assertions

Reviews

• `/review-api` passes
• `/review-demos` passes
• `/review-a11y` passes
• `eslint` and `stylelint` pass

Ship

• Add changeset
• PR targets `staging/pfv6` (NOT `main`)