## Summary
Migrates all unit tests from `tests-ui/` to colocate with their source
files in `src/`, improving discoverability and maintainability.
## Changes
- **What**: Relocated all unit tests to be adjacent to the code they
test, following the `<source>.test.ts` naming convention
- **Config**: Updated `vitest.config.ts` to remove `tests-ui` include
pattern and `@tests-ui` alias
- **Docs**: Moved testing documentation to `docs/testing/` with updated
paths and patterns
## Review Focus
- Migration patterns documented in
`temp/plans/migrate-tests-ui-to-src.md`
- Tests use `@/` path aliases instead of relative imports
- Shared fixtures placed in `__fixtures__/` directories
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7811-chore-migrate-tests-from-tests-ui-to-colocate-with-source-files-2da6d73d36508147a4cce85365dee614)
by [Unito](https://www.unito.io)
---------
Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>
This PR cleans up the base-layer utilities so they no longer pull
renderer or workbench code. The renderer-only `isPrimitiveNode` guard
now lives in `src/renderer/utils/nodeTypeGuards.ts`, and the node
help/model/ordering helpers have moved into `src/workbench/utils`. All
affected services, stores, scripts, and tests were updated to import
from the new locations.
The idea is to reduce the number of Base→Renderer/Base→Workbench edges
(higher scoped base/common utils should not import from
renderer/workbench layers).
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6621-refactor-move-renderer-dependent-utils-into-workbench-scope-2a36d73d36508167aff0fc8a22202d7f)
by [Unito](https://www.unito.io)
