feat: enhance layer masking functionality and brush controls

- Refactor LayersSheet component to support mask editing state and improve layer visibility handling.
- Introduce functions to collect mask layer IDs and count display layers excluding masks.
- Update BrushControls to include mask view mode options and a Done button for exiting mask editing.
- Modify brush session handling to support brush previews when editing masks.
- Implement a new BrushPreviewRenderer for rendering brush strokes with visual feedback.
- Add document geometry utilities for transforming points and resolving layer bounds.
- Ensure proper cleanup of brush preview on pointer leave and other interactions.

commands/ids.ts

@@ -18,12 +18,18 @@ export const commandIds = {
   documentSetLayerLocked: "document.setLayerLocked",
   documentRenameLayer: "document.renameLayer",
   documentSetLayerClippingMask: "document.setLayerClippingMask",
+  documentAddLayerMask: "document.addLayerMask",
+  documentRemoveLayerMask: "document.removeLayerMask",
   selectionSet: "selection.set",
   selectionClear: "selection.clear",
   selectionAddLayer: "selection.addLayer",
   toolSetActive: "tool.setActive",
   toolSetBrushSettings: "tool.setBrushSettings",
-  toolSetMaskEditLayer: "tool.setMaskEditLayer",
+  toolSetBrushPreview: "tool.setBrushPreview",
+  toolSetBrushStrokePreview: "tool.setBrushStrokePreview",
+  toolSetMaskViewMode: "tool.setMaskViewMode",
+  toolEnterMaskEdit: "tool.enterMaskEdit",
+  toolExitMaskEdit: "tool.exitMaskEdit",
   toolEnterTemporaryPan: "tool.enterTemporaryPan",
   toolExitTemporaryPan: "tool.exitTemporaryPan",
   transformBegin: "transform.begin",