Fix PyInstaller build failure from relative imports in node_editor

[Copilot]

PyInstaller builds fail with ImportError: attempted relative import with no known parent package when executing the bundled application. The error originates from relative imports in node_editor/node_editor.py.

Changes

node_editor/node_editor.py: Replace relative imports with absolute imports

# Before
from .style import STYLE
from .util import _dpg_lock

# After
from node_editor.style import STYLE
from node_editor.util import _dpg_lock

This aligns with the import pattern already used throughout the codebase (main.py, all test files).

Original prompt

Traceback (most recent call last):
File "main.py", line 25, in
File "pyimod02_importers.py", line 457, in exec_module
File "node_editor\node_editor.py", line 16, in
from .style import STYLE
ImportError: attempted relative import with no known parent package
[PYI-7300:ERROR] Failed to execute script 'main' due to unhandled exception!

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