fix: preserve PreviewGroup imageRender contract

[Cherry7593]

What changed

Make GroupPreviewConfig omit the base imageRender member before redeclaring the grouped callback, and add a runtime regression test for its numeric current value.

Root cause

GroupPreviewConfig extends InternalPreviewConfig, but narrows imageRender from an optional info.current to a required one. Strict TypeScript consumers therefore report TS2430 for the published declaration.

The runtime contracts are genuinely different: single-image rendering may omit current, while PreviewGroup always supplies its active numeric index.

Why this shape

Omit<InternalPreviewConfig, 'imageRender'> preserves all other base members and allows the grouped callback to retain its stronger contract without invalid interface inheritance. Runtime JavaScript is unchanged.

Validation

• TypeScript 5.9.3 strict consumer with skipLibCheck: false passed
• upstream TypeScript 6 typecheck passed
• focused PreviewGroup suite: 17/17 passed
• complete upstream suite: 8/8 suites, 81/81 tests and 1 snapshot passed
• lint, Father ESM/CJS/declaration build, Less compile, and package output passed with the separately validated ESLint 10 command compatibility adjustment

The added test verifies imageRender receives current 0 initially and 1 after navigation.

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