feat: 🎸 Enable react-hooks lint rules and fix all stale-closure

[SlDo]

Enable react-hooks lint rules repo-wide; fix all stale-closure findings; add useEventCallback

eslint-plugin-react-hooks was installed but none of its rules were enabled — the class of bugs behind the recent Slider and Calendar stale closures was invisible to CI. rules-of-hooks and exhaustive-deps now run as errors (with rules-of-hooks off for Storybook CSF render functions, which are false positives).

• new @vega-ui/hooks export: useEventCallback — a stable-identity wrapper that always calls the latest handler (the industry "latest ref" pattern à la MUI/Radix/Floating UI), throws in development if called during render
• useScrollSnap: onSnapChanging/onSnapChange/getSnapPoint go through useEventCallback, so inline consumer callbacks no longer resubscribe the scrollend listener and observers on every render; the remaining deps are honest
• Calendar: onSelectDay no longer freezes the first onChange — it reads the latest callback through useEventCallback while keeping a stable identity (regression-tested by swapping onChange between renders)
• NumberField: decrement no longer clamps against a stale max; the native non-passive wheel listener is attached only while changeOnWheel is enabled and no longer resubscribes when min/max/step or the value change
• useSelection: a consumer-provided resolveRange no longer cascades identity changes into select/expand/toggle
• Collapsible: onChangeHidden fires only when hidden actually changes — an inline callback no longer re-triggers the notification effect on every parent render
• all remaining findings were stable-value dependencies added for free, plus three documented intentional suppressions (useMutationObserver per-field options deps, createContext shallow-by-value memoization, SnapScrollerContent unmount-only unregistration)