Phase 4: Docked Material Editor & Toolbar Reorganization

[fernandotonon]

Goal

Bring the material editor into the main window as a dock panel and reorganize toolbars for better discoverability.

4a. Dock Material Editor

• Load MaterialEditorWindow.qml in QQuickWidget inside right-side QDockWidget
• Keep float/undock option for dual-monitor workflows

4b. Reorganize Toolbars

• File: Import, Export, Save Scene
• Transform: Select, Translate, Rotate, Scale, World/Local toggle
• Create: Add Primitive dropdown
• View: Grid, Normals, Mesh Info, ViewCube toggles (currently buried in Options menu)

4c. Status Bar

• Current transform mode + space, selection info, FPS counter

Depends on: Phase 3
Part of: UX Redesign Roadmap