region visualization and misc QoL

[PeenScreeker]

This PR improves the following zoning UI features:

• Ensure correct region menu is shown based on tab selection
• Zoning edits only reset when "Cancel Edit" is clicked. Closing the zone menu no longer resets zone defs
• Zones render changes as properties are modified
• Newly created zones are initialized with default height
• Picking a corner below the current region bottom updates the region bottom value
• Point picking mode now shows visualization of region points before region is defined

Requires red changes to render zone visualization while picking points.

Checks

• I have thoroughly tested all of the code I have modified/added/removed to ensure something else did not break
• I have followed semantic commit messages e.g. feat: Add foo, chore: Update bar, etc...
• My branch has a clear history of changes that can be easy to follow when being reviewed commit-by-commit
• My branch is functionally complete; the only changes to be done will be those potentially requested in code review
• All changes requested in review have been fixuped into my original commits.
• Fully tokenized all my strings (no hardcoded English strings!!) and supplied bulk JSON strings below

[tsa96]

LGTM, so excited to show this off.

[tsa96]

Oh sorry I probably merged this too soon, wanted to get this in so I could rebase my typescript porting stuff on top