Annotation - apply label to frame pixels directly

[ShrimpCryptid]

Use Case

Chantelle described that sometimes there are missing segmentations or parts of the image frame that she wants to label, especially for early segmentation validation. These labels would need to be applied directly to the frame and scientists would want to export them.

Acceptance Criteria

• Clicking on an empty part of the frame in annotation editing mode places a label marker in that position, and adds it to a (separate?) table in the annotations tab.
• Clicking on the marker again (or somewhere near it) will remove it.
• Clicking on the marker with a different annotation label will add the additional label to it.
• When exporting, the pixel data should be saved as a CSV with columns for time, X, Y, and labels.

Details

• Update canvas click and/or hover events to report XY pixels in addition to selected track.
• Update AnnotationData to support storing pixel coordinate pairs + times for labels.
• Update rendering in annotation.ts to handle + render frame pixel-based labels.

Questions:

• Should the pixel coordinates be a separate CSV, or saved into the same one?