Show feature and body actions on their rows in the Design sidebar

Each Feature tree row now carries Edit, Show/hide and Delete, and each
Bodies row carries Move, Show/hide and Delete. These act on that row
instead of on the selection. The eye shows a closed eye when the item
is hidden. Every clickable icon in the sidebar now highlights on hover.

Rename and Color now come first in the right-click menu, as items of
their own instead of inside Modify. This applies wherever they appear,
whether opened from the viewport or from a Bodies row.

Clicking an already-selected row no longer starts a rename; use F2,
the row's right-click menu, or the Rename command.

scripts/CAD/gen_offer_table.py

@@ -114,7 +114,7 @@ def main():
         "struct OfferVerb {",
         "    const char* id;",
         "    const char* name;        // drawing-office word (L10); marked L(); translated at use",
-        "    int         row;         // 0..7, the ratified index — NEVER reorder",
+        "    int         row;         // index into kOfferRowNames, the ratified address — NEVER reorder",
         "    const char* key;         // shortcut shown in the row, or nullptr",
         "    const char* action;",
         "    const char* refusal;     // why this row is greyed, in the product's own words",
@@ -135,11 +135,20 @@ def main():
         "// Row labels, in ratified order.",
         "static const char* const kOfferRowNames[] = {",
     ]
+    # A flat row's label is never shown, so it is not marked for translation.
     for s in A["slots"]:
-        lines.append(f'    {tstr(s["label"])},')
+        lines.append(f'    {cstr(s["label"]) if s.get("flat") else tstr(s["label"])},')
     lines += [
         "};",
         f"static const int kOfferRowCount = {len(slots)};",
+        "// A flat row is not a family: its verbs come first, at the top level of the offer, each",
+        "// an item of its own.",
+        "static const bool kOfferRowFlat[] = {",
+    ]
+    for s in A["slots"]:
+        lines.append(f'    {"true" if s.get("flat") else "false"},')
+    lines += [
+        "};",
         "",
         "static const OfferVerb kOfferVerbs[] = {",
     ]

scripts/CAD/tool_atlas.json

@@ -67,6 +67,12 @@
       "angle": 225,
       "label": "Modify",
       "why": "edits or removes what is already there"
+    },
+    {
+      "id": "top",
+      "label": "Top",
+      "flat": true,
+      "why": "the verbs a selection is opened for most. A flat slot is not a family: its verbs sit first, at the top level of the offer, each an item of its own, and its label is never shown. Appended last, so no ratified index moved."
     }
   ],
   "selections": [
@@ -1044,7 +1050,7 @@
     {
       "id": "rename",
       "name": "Rename…",
-      "slot": "modify",
+      "slot": "top",
       "key": "F2",
       "feature": "Tree",
       "mcp": null,
@@ -1084,7 +1090,7 @@
     {
       "id": "colour",
       "name": "Color",
-      "slot": "modify",
+      "slot": "top",
       "key": null,
       "feature": null,
       "mcp": null,