[Vetting UI] Integrate updated spectrogram overlays and measurement metrics

[aashish24]

Background:
Measurements and metrics should be overlaid directly and not depend on bounding boxes.

Requirements (Data Task Checklist):

• Implement an updated spectrogram view.
• Overlay measurement metrics (for example, characteristic frequency) directly on the spectrogram.

Acceptance criteria:

• Metrics appear correctly on the spectrogram view.
• No box-based measurement is required.