[tevinch]

Fixes #3897.

A Combobox with a union value type such as string | Option rejects valid by and virtual.disabled callbacks when multiple is a boolean or true. The multiple branch applies NoInfer before EnsureArray, which can collapse the union to its common properties. It can also accept unrelated virtual options.

This follows the use-site approach suggested in the report: apply NoInfer after deriving the array or element type for by, virtual.options and virtual.disabled. Runtime code and the shared EnsureArray helper are unchanged.

The compiler-backed regression uses real Combobox JSX. It covers primitive/object and object/object unions, boolean and literal multiple modes, inferred arrays, incompatible callbacks/options, and option-driven type widening. It fails on the original source and passes with this change using the repository's TypeScript 5.4.3.

Validation:

• The original consumer fails with two TS2322 errors against npm 2.2.10 and compiles unchanged against the packed correction with TypeScript 5.9.2.
• Full npm test -- --runInBand: 56 suites, 2,046 tests and 100 snapshots pass; 36 tests skipped. An initial untouched-source run hit a Vue transition timing snapshot; the final full run passes without changing it.
• Repository formatting passes. React/Vue output built and the packed React declarations compile in a separate NodeNext consumer. An esbuild launcher stalled during the build; rerunning the same ESM compilation with its bundled binary completed it.

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