Draft: Recentre as part of stage measure thing

Joe Knapperrequested to merge
recentre-from-rom into v3

Closes #499

Julian, review this before I'm ready and I'll assign it to you

This MR contains the following

  • Currently, a separate recentre thing

Before merge:

  • Combine into the stage measure thing
  • Replace lateral offset with percent of FOV
  • Tests

Merge checklist:

  • All new/changed functions have up to date typehints and docstrings
  • Any UI updates have a before and after screenshot in the MR description
  • Unit testing of new functionality has similar or better coverage than similar existing code
  • This code has been tested on a microscope
    • Webapp has been recompiled, with aesthetic changes checked in light and dark mode (if changed)
    • With updated settings JSON (if changed)
    • SmartScan and live stitching work
Edited by Joe Knapper

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