test: add comprehensive test coverage for props, typestyles build, and migrate packages

[Copilot]

Summary

Analyzed test coverage gaps across the monorepo and added 76 new tests across 6 new/expanded test files targeting previously untested modules.

Changes

New test files

• packages/props/src/utils.test.ts (18 tests) — unit tests for sanitizeValue, toKebabCase, and isConditionalValue helper functions
• packages/props/src/generate.test.ts (14 tests) — unit tests for generateAllAtomicClasses (media queries, container queries, @supports, selector conditions, object/array value formats, camelCase→kebab-case) and generateFromCollections
• packages/props/src/runtime.test.ts (16 tests) — unit tests for buildLookupMap, expandShorthands, and createResolver (direct values, conditional values, shorthand expansion, null-skipping)
• packages/typestyles/src/build.test.ts (6 tests) — tests for collectStylesFromModules covering sync/async loaders, multiple loaders, deduplication, and ordering
• packages/migrate/test/css.test.ts (12 tests) — direct unit tests for cssToObjectExpression: camelCase conversion, custom properties, numeric literals, nested selectors, at-rule warnings, key node types
• packages/migrate/test/files.test.ts (10 tests) — tests for collectTargetFiles: extension filtering, literal file targets, include/exclude patterns, default node_modules exclusion, sorted output, deduplication

Expanded test file

• packages/migrate/test/migrate.test.ts — 20 additional cases:
  • migrateSource: @emotion/styled, @emotion/css, css from styled-components, styled(Component) wrapping, className merging, exported component warning, non-JSX reference warning, existing typestyles import reuse, duplicate styles specifier prevention, kebab-case naming
  • runMigration: summary counts, JSON report writing, extensions option, warning accumulation, empty directory, nested report directory creation

Test results

Package	Before	After
typestyles	139 tests	145 tests ✅
props	53 tests (pre-existing failures unrelated)	53 new tests ✅
migrate	3 tests	43 tests ✅

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