models: rename a model's display name from the panel context menu

Adds a 'Rename' action to the model (non-group) context menu, mirroring
renameGroup: prompts via QInputDialog, trims, and calls
setModelDisplayName + notifyFederationChanged. The Federation already emits
modelChanged, so the panel item text updates in place.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/bonsaiviewer/modules/models/Commands.cpp

@@ -187,6 +187,22 @@ void renameGroup(SessionState& session, QWidget& host, const QString& group_id)
     session.setStatusMessage("Models", "Group renamed");
 }
 
+void renameModel(SessionState& session, QWidget& host, const QString& model_id) {
+    const Federation::Model* model = session.federation()->findById(model_id);
+    if (!model) return;
+
+    bool ok = false;
+    const QString name = QInputDialog::getText(
+        &host, "Rename Model", "Model name:", QLineEdit::Normal, model->display_name, &ok);
+    if (!ok) return;
+    const QString trimmed = name.trimmed();
+    if (trimmed.isEmpty()) return;
+
+    session.federation()->setModelDisplayName(model_id, trimmed);
+    session.notifyFederationChanged();
+    session.setStatusMessage("Models", "Model renamed");
+}
+
 void moveGroup(SessionState& session, const QString& id, const QString& parent_group_id) {
     session.federation()->setGroupParent(id, parent_group_id);
     session.notifyFederationChanged();

src/bonsaiviewer/modules/models/Commands.h

@@ -55,6 +55,7 @@ namespace bonsaiviewer::modules::models::commands {
 void toggleVisibility(SessionState& session, ItemKind kind, const QString& id);
 void addGroup(SessionState& session, QWidget& host, const QString& parent_group_id);
 void renameGroup(SessionState& session, QWidget& host, const QString& group_id);
+void renameModel(SessionState& session, QWidget& host, const QString& model_id);
 void moveGroup(SessionState& session, const QString& id, const QString& parent_group_id);
 void moveModels(SessionState& session, const QStringList& ids, const QString& parent_group_id);
 void removeGroup(SessionState& session, QWidget& host, const QString& group_id);

src/bonsaiviewer/modules/models/Panel.cpp

@@ -321,6 +321,12 @@ ModelsPanel::ModelsPanel(bonsaiviewer::SessionState* session_state,
                 parent_group_id = idOf(parent_index);
             }
 
+            QAction* rename = menu.addAction(
+                components::icons::makeSvgIcon(":/icons/cube.svg"), "Rename");
+            connect(rename, &QAction::triggered, this, [this, id]() {
+                commands::renameModel(*session_state_, *this, id);
+            });
+
             QAction* add_group = menu.addAction(
                 components::icons::makeSvgIcon(":/icons/folder-plus.svg"), "New Group");
             connect(add_group, &QAction::triggered, this, [this, parent_group_id]() {