Bonsai: wire Shift+Q quantity take off hotkey into Spatial tool

Fixes #4443. The Wall/Slab/other authoring tools (BimTool subclasses)
already bind Shift+Q to bim.perform_quantity_take_off via hotkey_S_Q,
but the Spatial tool has its own separate keymap/operator
(bim.spatial_hotkey) that never registered a Q entry, forcing users to
switch tools just to (re)calculate quantities for a selected element.
Added the same Shift+Q keymap entry and a matching hotkey_S_Q handler
to the Spatial tool, mirroring BimTool's existing behavior exactly
(including the same selected-objects guard).

The other part of the request, a bulk "calculate all quantities"
entry point, already exists today: bim.perform_quantity_take_off
computes quantities for every IfcElement when no objects are
selected, exposed via the Scene > Quantity Take-off panel regardless
of which workspace tool is active, so no change was needed there.

AI-generated, reviewed and tested by BIMvoice.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/bonsai/bonsai/bim/module/spatial/workspace.py

@@ -45,6 +45,7 @@ class SpatialTool(WorkSpaceTool):
         ("bim.spatial_hotkey", {"type": "T", "value": "PRESS", "shift": True}, {"properties": [("hotkey", "S_T")]}),
         ("bim.spatial_hotkey", {"type": "G", "value": "PRESS", "shift": True}, {"properties": [("hotkey", "S_G")]}),
         ("bim.spatial_hotkey", {"type": "H", "value": "PRESS", "shift": True}, {"properties": [("hotkey", "S_H")]}),
+        ("bim.spatial_hotkey", {"type": "Q", "value": "PRESS", "shift": True}, {"properties": [("hotkey", "S_Q")]}),
     )
 
     def draw_settings(context, layout, ws_tool):
@@ -184,3 +185,9 @@ class Hotkey(bpy.types.Operator, tool.Ifc.Operator):
 
     def hotkey_S_G(self):
         bpy.ops.bim.generate_space()
+
+    def hotkey_S_Q(self):
+        # Mirrors BimTool.hotkey_S_Q so quantities can be (re)calculated without switching tools.
+        if not bpy.context.selected_objects:
+            return
+        bpy.ops.bim.perform_quantity_take_off()