This simplifies the rect calculations by making the gap between pixels
into a padding applied directly to the leaf nodes. This means the gaps
won't be present in the overlay layer, so when dragging a node around it
is always over an OverlayNode and the pendingAction won't be unset.
Also simplifies onDrop handling
This PR is a large refactoring of the layout code to move as much of the
layout state logic as possible into a unified model class, with atoms
and derived atoms to notify the display logic of changes. It also fixes
some latent bugs in the node resize code, significantly speeds up
response times for resizing and dragging, and sets us up to fully
replace the React-DnD library in the future.
This will ensure that the webview cannot capture the pointer events and
disrupt the drag functionality.
This also fixes an issue where greedy and imprecise bounds calculations
could result in thrashing of the layoutState.pendingAction field, which
could cause the placeholder to flicker.
This also fixes issues where some React Effects that were supposed to be
debounced or throttled were being invoked too much. This is because
useEffect regenerates the callback when it is run, resulting in the
debounce or throttle never taking effect. Moving the throttled or
debounced logic to a separate callback solves this.
Adds the implementation for the "Magnify Block" context menu item. This
will pop a block out of the layout and bring it to the foreground.
This also cleans up some block styling to make radii more consistent.
<img width="814" alt="image"
src="https://github.com/user-attachments/assets/c81521e1-c91f-4bb5-9eec-ff0eda178268">
