fix(state): sort object keys before preview pagination

[shuaiyafei]

Loading more object properties should append the next alphabetically ordered batch without moving previously displayed rows. Sort the complete key list before slicing previews, and sort the frozen key snapshot used by cursor pagination so both paths agree.

Regression coverage exercises initial previews, show-more expansion, and cursor pages with 65 properties inserted in reverse order. Explicit key snapshots retain their supplied order, while arrays, Map, and Set keep their existing collection order.

Addresses the stable-ordering request in #1143.

Validation: pnpm build, pnpm check, pnpm test (408 passed), pnpm typecheck, and git diff --check.

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