Browser tree: components with an activation radio (others drawn faded), ground pin, groups in Bodies/Sketches/Construction (new, from selection, rename, ungroup, kept in the design: browser.group/ungroup/rename_group/move/order), drag and drop to reorder, into and out of groups and into another component, Ctrl/Shift multi-select, hover lights the bodies, folds remembered; occurrence Move/Copy with a gizmo and Capture Position/Revert; the viewport shows bodies where their occurrences place them

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/doc/src/document.rs

@@ -807,6 +807,25 @@ pub struct Document {
     /// Bodies moved into another component than their feature's (by body name).
     #[serde(default, skip_serializing_if = "std::collections::BTreeMap::is_empty")]
     pub body_components: std::collections::BTreeMap<String, u64>,
+    /// Browser groups (folders of bodies, sketches or construction planes).
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub browser_groups: Vec<BrowserGroup>,
+    /// Browser item order per component folder (`"<component>/<folder>"` → item keys).
+    #[serde(default, skip_serializing_if = "std::collections::BTreeMap::is_empty")]
+    pub browser_order: std::collections::BTreeMap<String, Vec<String>>,
+}
+
+/// A browser group: items of one folder (`bodies`, `sketches` or `construction`) of a
+/// component, by key (body name, or the feature id of a sketch or construction plane).
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+pub struct BrowserGroup {
+    pub id: u64,
+    pub name: String,
+    #[serde(default)]
+    pub component: u64,
+    pub folder: String,
+    #[serde(default)]
+    pub items: Vec<String>,
 }
 
 fn default_format() -> String {
@@ -839,6 +858,8 @@ impl Document {
             materials: Default::default(),
             favorites: Default::default(),
             param_comments: Default::default(),
+            browser_groups: Vec::new(),
+            browser_order: Default::default(),
         }
     }