feat(tooltip): add showDelay/hideDelay props (#794)

[wanchun]

Closes #794

Adds showDelay and hideDelay Number props to FTooltip, mapped to the underlying popper's showAfter/hideAfter.

Implementation:

• tooltip.tsx: New showDelay and hideDelay props (Number, default 0) — passed through to popper
• 2 vitest tests verifying both delays work via fake timers

Files changed: 2. No lockfile. No test-infra changes.

[wanchun]

Closed as part of v3 rebuild from chore/test-infra. Original v1/v2 PRs being superseded by clean re-implementation (vitest + playwright + docs).