Openings get descriptions: zone is the keyword, this is the sentence

Eric's ask. Free text on any opening ("tall bookcase by the window —
kids reach the bottom rows"), edited in the opening settings sheet,
shown under the sheet's title, and surfaced as the cell's hover title
on the wall diagram. Stored in furniture.json like everything else.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jXZFSTZQKzAC8fqpWSz9g

data/furniture.json

@@ -110,7 +110,7 @@
         {
           "id": "library-kallax-d4",
           "label": "D4",
-          "zone": "cubes",
+          "zone": "campaign",
           "width_in": 13.25,
           "height_in": 13.25,
           "depth_in": 15.4