Snaps are on by default

Users can still turn them off. We are a precision modeling app after all
:)

src/bonsai/bonsai/bim/handler.py

@@ -336,3 +336,9 @@ def load_post(scene):
         WallAxisDecorator.install(bpy.context)
     if model_props.show_slab_direction:
         SlabDirectionDecorator.install(bpy.context)
+
+    if scene := bpy.context.scene:
+        # Snapping is off by default in Blender, but in BIM, it's more useful to be on
+        scene.tool_settings.use_snap = True
+        # Match default Bonsai snaps
+        scene.tool_settings.snap_elements_base = {"EDGE", "EDGE_PERPENDICULAR", "VERTEX", "EDGE_MIDPOINT", "FACE"}

src/bonsai/bonsai/bim/prop.py

@@ -588,14 +588,14 @@ class BIMFilterGroup(PropertyGroup):
 
 
 class BIMSnapGroups(PropertyGroup):
-    object: BoolProperty(name="Object")
-    polyline: BoolProperty(name="Polyline")
-    measure: BoolProperty(name="Measure")
+    object: BoolProperty(name="Object", default=True)
+    polyline: BoolProperty(name="Polyline", default=True)
+    measure: BoolProperty(name="Measure", default=True)
 
 
 class BIMSnapProperties(PropertyGroup):
-    vertex: BoolProperty(name="Vertex")
-    edge: BoolProperty(name="Edge")
-    edge_center: BoolProperty(name="Edge Center")
-    edge_intersection: BoolProperty(name="Edge Intersection")
-    face: BoolProperty(name="Face")
+    vertex: BoolProperty(name="Vertex", default=True)
+    edge: BoolProperty(name="Edge", default=True)
+    edge_center: BoolProperty(name="Edge Center", default=True)
+    edge_intersection: BoolProperty(name="Edge Intersection", default=True)
+    face: BoolProperty(name="Face", default=True)