fix(compiler): keep spread arguments in call/new expressions and list foreign-decorated members in propDecorators

[Brooooooklyn]

Summary

Fixes #511 — two byte-parity divergences from ngtsc in setClassMetadata / decorator metadata emit:

1. Spread arguments were flattened. Argument::SpreadElement in call and new expressions converted the inner expression but dropped the ..., so f(...P) emitted as f(P) and new Box(...P) as new Box(P). Both convert_call_expression_with_optional and convert_new_expression now wrap the argument in OutputExpression::SpreadElement, which the emitter already prints as ...expr.

2. propDecorators skipped members whose decorators aren't Angular's. ngtsc lists any member with member.decorators.length > 0 (metadata.ts:107); decoratedClassMemberToMetadata filters the array to Angular decorators, so a member carrying only foreign/local decorators emits prop: []. We gated the whole entry on !angular_decorators.is_empty() and emitted nothing. Now gated on !decorators.is_empty(). This also fixes decorated signal-initializer members (@Foo() x = input(...)) — upstream's decorated branch wins, so they emit x: [], not the initializer-API entry.

Ground truth verified by compiling repros with real ngtsc (@angular/compiler-cli 22.x): emits { x: [], y: [{type: Input}] } and { c: [], d: [], b: [{type: core.Output}] }.

Changes

• src/output/oxc_converter.rs: preserve SpreadElement in call/new args (issue comment references).
• src/class_metadata/builders.rs: propDecorators entry unconditional on the member having decorators.
• New tests/spread_metadata_emit_test.rs (5 tests): spread preserved in full + partial mode for call and new; x: [] for foreign-decorated and decorated-signal members.
• Updated stale assertions in decorator_metadata_ngtsc_test.rs (c:[],d:[]) and integration_test.rs (foreignMember:[] + insta snapshot) to the ngc-verified shape.

Verification

• cargo test --all-features: all pass
• cargo check, cargo check --all-features, cargo fmt --all -- --check: clean
• cargo run -p oxc_angular_conformance: 1264/1264

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-07T07:56:22.636966Z	1bbca3b	New commits

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