Prevent group delete at the same time as select or when panel is up

[RailKill]

This bug was introduced by me in #19, it allowed the user to delete nodes with the Delete key while the panel is open. This causes crashes because the node is no longer there while editing properties, as the Delete key is used in text-editing as well, but will delete the node at the same time. There was also a funny way to crash the program by selecting the node and deleting it within await 0.1 seconds, so the node is no longer there when the panel wants to open.

This PR fixes the 0.1 second crash window, and prevent crashes associated with triggering the Delete hotkey while panel is open. You can still delete nodes with the 'X' button while the panel is open, this works fine and doesn't crash the program, the problem is with the delete timing with the Delete key.

Summary by Sourcery

Prevent node deletion when the side panel is open or when a node is selected and deleted within a short time frame to fix crashes.

Bug Fixes:

• Fix crashes caused by deleting nodes with the Delete key while the side panel is open by adding checks to prevent deletion in this state.
• Resolve a crash issue that occurred when selecting and deleting a node within 0.1 seconds, ensuring the node is valid before setting it as active.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses a bug introduced in a previous commit (#19) that allowed users to delete nodes with the 'Delete' key while the panel is open, causing crashes. The changes prevent node deletion when the side panel is visible or when a node is being actively edited. Additionally, it fixes a crash that occurred when selecting and deleting a node within a 0.1-second window.

File-Level Changes

Files	Changes
Scripts/MonologueGraphEdit.gd	Modified the _input function to prevent node deletion when the side panel is visible or a node is being actively edited
Scripts/SidePanelNodes/SidePanelNodeDetails.gd	Updated the on_graph_node_selected function to set the active_graphnode only when the node is valid, not in moving mode, and is the only selected node

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[sourcery-ai]

Hey @RailKill - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[atomic-junky]

Seems good to me!