- editor-shell: redirect to / if not authenticated on load
- file-tree: open file in first clean matching panel, create new panel if all dirty
- Editor: add openDocumentIn() with targetElement for precise panel targeting
- panels: skip onDocumentOpened if targeted at a different panel
- FileEditorRegistry: add Godot extensions (gd, gdshader, gdshaderinc, gdinclude, glsl, tscn, tres, cs, gdextension)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>