Feat: Fix drag and drop issues for custom nodes

[KC-Miles]

This PR addresses the nodeSize error that occurs during drag and drop operations for custom nodes in GutenTap. The changes provide a more robust handling of drag and drop events, including fallback mechanisms for when the standard operation fails.

Changes:

Modified the endDragging method in the GutenTap component:

• Added a try-catch block around the nw function call.
• Implemented a fallback mechanism for moving nodes when an error occurs.
• Added handling for cases where nodeSize might be undefined.

Updated the startDragging method to ensure draggedNodePosition is always set.

Testing:

• Tested drag and drop operations with various custom nodes.
• Verified that the nodeSize error no longer occurs.
• Ensured that the fallback mechanism works correctly when the standard drag and drop operation fails.

Notes:

This change may slightly impact the performance of drag and drop operations due to the added try-catch block. However, the impact should be minimal and is outweighed by the improved reliability.

[johnpuddephatt]

Hey @KC-Miles, thanks for this!

1. Are you seeing drag/drop errors on the demo at https://gutentap.letsdance.agency/ ? I ask because I thought drop/drop was working after some changes I made in response to #3 . It wouldn't surprise me if there are still some issues because it was very temperamental for a long time, I would just like to be able to recreate the issue(s).

2. You've made changes to /lib/guten-tap.js. Changes need to be made within the /src/ folder and then built and then pushed. Otherwise whenever the build process is run the changes in /lib/ would be lost (also the changes you have made are currently not present in both /lib/guten-tap.js and /lib/guten-tap.umd.cjs whereas if they are made in /src/ and the build process is run then they will be present in both). If you need help with this just give me a shout – you should just be able to run npm install and then npm run build