Fix hydrated innerHTML with attribute spreads

[puneetdixit200]

Fixes #2737.

This prevents an attribute-only spread from installing a child reconciliation effect when the spread props do not include child-bearing props. During hydration, that effect could clear existing innerHTML content on the first reactive spread update.

Added a regression test that hydrates server-rendered innerHTML, updates a spread-only data attribute, and verifies the content remains intact.

Verification:

• pnpm --dir packages/solid test web/test/element.spec.tsx
• git diff --check

Note: pnpm --dir packages/solid exec tsc --project web/tsconfig.build.json was attempted in a fresh checkout, but it requires generated local package links/types first and failed before checking this change.

[changeset-bot]

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Latest commit: 25a01be

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