refactor: Fix React Compiler violation in Tooltip

[frankieyan]

Part of #1066.

• File: src/tooltip/tooltip.tsx
• Violation: Hooks must be the same function on every render (Error, line 136): tooltip.useState('open') (AriaKit store hook). Note: the child.ref access on line 147 is guarded by eslint-disable react-hooks/refs but does not currently produce a recorded compiler error.

Steps

1. Reproduce and confirm the violation.
2. Fix: migrate tooltip.useState('open') to useStoreState(tooltip, 'open') from @ariakit/react, per #conditional-hook-calls. Same migration as refactor: Fix React Compiler violations in Menu #1068 (menu) and refactor: Fix React Compiler violations in Tabs #1070 (tabs); can be batched into one PR.
3. Confirm the count dropped; let the hook update the record file.
4. Verify memoization in the compiled output.