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4a9b715b3a
Adds a test verifying that `transformedValue` exposes parse errors via
the returned signal's `parseErrors()` property when no FormField
context is present.
This ensures that:
- parse errors are still observable without DI-based field propagation
- the model is not updated when `parse` omits `value`
- valid input clears parse errors and updates the model
This test protects the documented contract that DI-based error
propagation is expected for FormValueControl usage, while standalone
usage relies on explicit consumption of `parseErrors()`.
(cherry picked from commit 71b8159b37)