Fixes three concrete builder issues in common/files/builder:\n- Use bool type from shape when selecting style source for difference bools\n- Persist :strokes correctly (fix typo :stroks)\n- Validate add-file-media params after assigning default id\n\nAlso adds regression tests in common-tests.files-builder-test and registers them in runner.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: raguirref <ricardoaguirredelafuente@gmail.com>