v4.7.39 — Logo-as-Watermark Option

Added a Watermark Source setting (Text / Institute Logo) for the print watermark. Institute Logo tiles the configured logo instead of text, with its own Watermark Logo Size control; opacity and horizontal/vertical spacing are shared with the existing text watermark — no duplicate controls.

Note: a non-transparent logo (e.g. with a white background) will show a visible tile edge when repeated — use a transparent PNG for a clean result.

Full Changelog: v4.7.38...v4.7.39