fix(solid): exclude keys shared across splitProps groups on the proxy path

[spokodev]

Problem

splitProps proxy path duplicates a key that is shared across two groups, disagreeing with its own plain-object path and with the documented contract that a property belongs to a single group.

Repro

// plain object source
const [g1, g2, rest] = splitProps({ a: 1, b: 2, c: 3 }, ["a", "b"], ["b", "c"]);
// g2.b === undefined, "b" in g2 === false, Object.keys(g2) === ["c"], { ...g2 } === { c: 3 }   (correct)

// createStore proxy source (same as component props at runtime)
const [state] = createStore({ a: 1, b: 2, c: 3 });
const [p1, p2, prest] = splitProps(state, ["a", "b"], ["b", "c"]);
// ACTUAL:   p2.b === 2, "b" in p2 === true, Object.keys(p2) === ["b", "c"], { ...p2 } === { b: 2, c: 3 }
// EXPECTED: p2.b === undefined, "b" in p2 === false, Object.keys(p2) === ["c"], { ...p2 } === { c: 3 }

The key b is consumed by the first group but still leaks into the second group through get, has, enumeration, and spread.

Root cause

splitProps has two implementations. The plain-object path walks each property once and assigns it to the first group that lists it (first-match break), so keys are exclusive. The proxy path instead builds one Proxy per group whose get/has/keys each test k.includes(property) against that group's own key list, with no cross-group exclusion. A key present in two groups is therefore reported by both proxied groups. Component props and stores are proxies at runtime, so the proxy path is the one that actually runs for components.

Fix

In the proxy branch, track keys claimed by earlier groups and let each group own only its not-yet-claimed keys. get, has, and keys all read from that owned set, bringing the proxy path to parity with the plain-object first-match semantics. The rest proxy is unchanged, since it already excludes keys.flat().

Authority

Solid docs state splitProps partitions props and each property belongs to one group, and the plain-object implementation in the same function already enforces this with a first-match break.

Tests

Added a case to packages/solid/test/component.spec.ts asserting first-group-only ownership for both a plain object and a createStore proxy across get, has, keys, and spread. It fails on the current proxy path (expected 2 to be undefined) and passes with the fix.

packages/solid suite: 482 passing plus the new test. The only failure is the unrelated pre-existing web/test/transition.spec.tsx "Transition memo stale read (#2046)" flake, which is nondeterministic and passes when run in isolation on the clean tree.

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