Build tool: compact top-left card again; status row moved off the build bar

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/DESIGN.md

@@ -147,8 +147,9 @@ above, including:
   wall material and filter settings. G no longer picks, as the owner requested (it is now Replace).
 - **The build menu** is a bar of tabs and icon tiles along the bottom: Structure, Moving,
   Liquids, Machines, Molds. Hover a tile for its full description, cost and placement help;
-  gamepad players see the selected tile’s popup. The top-left card is hidden while building,
-  with variants, ghosts and status kept in the bar so the world stays clear.
+  gamepad players see the selected tile’s popup. While building, the top-left card shows a
+  compact summary (name, cost, variant chips, Replace, ghosts, how to place, status); the full
+  description is in the hover popup.
 - **No length limit when dragging.** Blocks out of the bot's reach become ghosts that it builds
   when it gets there.
 - **Pipes are thin:** sand, water and anything else loose passes them. Pumps and outlets are
@@ -168,6 +169,9 @@ above, including:
 - **Replace is held G, not Ctrl.** The owner hit the browser's Ctrl+W (close tab) and Ctrl+D
   (bookmark) while replacing and flying with WASD, and the game ignored WASD while Ctrl was held.
 
+- **The build tool has a compact top-left card** like the other tools. The owner asked for it
+  back after it was hidden; the long description stays in the hover popup.
+
 ## Ideas not built yet
 
 - **Concrete**, as a stronger wall material from rubble.