fix(pdf): rethrow download errors and check pre-baked font families

[gcutrini]

ref: https://app.clickup.com/t/86bbf0d90

The same two fixes as #318 (0f47091 and 38a3a7a), for the toolkit #317 added to v4.x:

• downloadBlob only logged a failed download, so createDocument().download() resolved and onError never ran. It rethrows the error after logging it.
• resolveFont registered a pre-baked container even when its fonts did not define the family, and pdfmake failed later while building the file. Such a container falls back to Helvetica, like a font URL that fails to load.

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