fix: preserve className styles on multi-config and non-style array targets

[Inv1x]

Summary

Fixes two related bugs where className-computed styles were silently destroyed:

• Non-style array targets (e.g. ["contentContainerStyle"]): deepMergeConfig did not merge className + inline styles for length-1 array targets. Inline values simply overwrote the className-computed value instead of producing a style array (the behavior already implemented for the ["style"] path).
• Multi-config components (e.g. ScrollView with both className→style and contentContainerClassName→contentContainerStyle): getStyledProps iterates over multiple configs, and each iteration produced a full props object via Object.assign. Later iterations overwrote earlier iterations' correctly-merged target props.

Reproduction

// Bug 1: contentContainerClassName styles destroyed by inline contentContainerStyle
<ScrollView
  contentContainerClassName="bg-green"
  contentContainerStyle={{ padding: 10 }}
/>
// Expected: contentContainerStyle = [{ backgroundColor: "#008000" }, { padding: 10 }]
// Actual:   contentContainerStyle = { padding: 10 }  ← className styles lost

// Bug 2: className styles destroyed on multi-config ScrollView
<ScrollView className="bg-red" style={{ paddingTop: 10 }} />
// Expected: style = [{ backgroundColor: "#f00" }, { paddingTop: 10 }]
// Actual:   style = { paddingTop: 10 }  ← className styles lost

Fix

1. Add a finalKey merge block for length-1 array targets in deepMergeConfig, mirroring the existing string-target merge logic.
2. Save each config iteration's computed target value in getStyledProps and restore them after the loop completes.

Test plan

• Added tests for ScrollView with contentContainerClassName + contentContainerStyle (non-overlapping props produce array, undefined/null preserves className)
• Added tests for multi-config ScrollView: className + style preserved when contentContainerClassName also present
• Added tests for FlatList contentContainerClassName + contentContainerStyle
• Added test for custom styled() with string target and style={undefined}
• Added test for consumed className sources cleanup
• All 1040 tests pass, typecheck and lint clean

[Copilot]

Pull request overview

Fixes cases where className-derived native styles were being lost when merging with inline props, especially for non-style array targets and multi-config components.

Changes:

• Update getStyledProps to preserve previously-merged target props across multiple config iterations.
• Update deepMergeConfig to merge className + inline styles for length-1 array targets (e.g. ["contentContainerStyle"]).
• Add/adjust tests covering ScrollView/FlatList and multi-config scenarios.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/native/styles/index.ts	Adjusts merge logic for multi-config iteration and length-1 array targets to avoid losing computed styles.
src/tests/native/className-with-style.test.tsx	Adds regression tests for non-style targets and multi-config components to ensure computed styles are preserved.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.