Deduplicate template error handling

[fabpot]

No description provided.

[upsun-dispatch]

📋 PR Summary

This PR deduplicates the exception-handling logic in Template::yield() and Template::yieldBlock() by extracting the two separate catch blocks into a single private handleException() helper. The single catch (\Throwable $e) now delegates to that helper, which enriches Twig Error instances (source context + line guessing) or wraps non-Twig throwables in a RuntimeError. A test confirms that a thrown Twig RuntimeError is enriched in place rather than re-wrapped.

Changes

Layer / File(s)	Summary
error handling refactor
src/Template.php	Replaced the duplicated catch (Error) / catch (\Throwable) blocks in yield() and yieldBlock() with a single catch that calls the new handleException() helper, which preserves the original enrich-vs-wrap behavior via an instanceof Error check.
tests
tests/ErrorTest.php	Added a test verifying a Twig RuntimeError thrown from a function is enriched (source context and line set) and re-thrown as the same instance rather than wrapped.