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chore(studio): migrate useStaticEffectEvent to React 19 useEffectEvent (#46415)

Studio is on `react@^19.2.6`, and `useEffectEvent` shipped stable in
React 19.2 with the same signature as the userland polyfill. This drops
the local hook in `apps/studio` and `apps/www` in favor of the built-in.

**Removed:**
- `apps/studio/hooks/useStaticEffectEvent.ts`
- `apps/www/hooks/useStaticEffectEvent.ts`
- `.claude/skills/use-static-effect-event/` — skill is obsolete

**Changed:**
- 26 call sites: dropped the `useStaticEffectEvent` import, added
`useEffectEvent` to the existing `react` import, renamed call sites
- `.claude/CLAUDE.md`: `apps/studio` row updated React 18 → React 19
- `.claude/skills/vercel-composition-patterns/SKILL.md`: removed stale
"Studio uses React 18, skip these patterns" warning

## To test

- `pnpm typecheck --filter=studio` — passes locally
- `pnpm typecheck --filter=www` — passes locally
- `grep -rn "useStaticEffectEvent"` returns nothing outside
`node_modules`
- Smoke-test areas that use the hook: schema visualizer edges
(intersection check), spreadsheet import, sign-in/CLI login flows, side
panels with unsaved-changes prompts

**Out of scope:** pre-existing Tailwind lint warning on
`DefaultEdge.tsx:141` (`outline` + `outline-1` conflict) — unrelated to
this migration

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Refactor**
* Internal event handling migrated to React’s built-in event hooks
across the Studio app; no user-facing changes.

* **Documentation**
* Clarified React 19 compatibility and noted Studio now targets React
19.
  * Removed obsolete documentation for a deprecated internal hook.

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