Struct headers: type+name format, auto-collapse, no footer when collapsed

- Add structTypeName field to Node for struct type names
- Struct headers now show: struct TYPENAME name {
- Auto-collapse structs/arrays by default
- Skip footer rendering when collapsed (cleaner view)
- Fix header span calculations for new format
- Disable brace matching (not needed for structured viewer)
- Change hover color to muted teal (distinct from keywords)

src/controller.cpp

@@ -1,4 +1,5 @@
 #include "controller.h"
+#include <Qsci/qsciscintilla.h>
 #include <QSplitter>
 #include <QFile>
 #include <QJsonDocument>
@@ -338,8 +339,8 @@ void RcxController::insertNode(uint64_t parentId, int offset, NodeKind kind, con
         n.offset = offset;
     }
 
-    // Assign ID before storing
-    n.id = m_doc->tree.m_nextId;
+    // Reserve unique ID atomically before pushing command
+    n.id = m_doc->tree.reserveId();
 
     m_doc->undoStack.push(new RcxCommand(this, cmd::Insert{n}));
 }
@@ -627,6 +628,10 @@ void RcxController::showContextMenu(RcxEditor* editor, int line, int nodeIdx,
             QStringLiteral("+0x") + QString::number(off, 16).toUpper().rightJustified(4, '0'));
     });
 
+    menu.addAction("Copy All as &Text", [editor]() {
+        QApplication::clipboard()->setText(editor->scintilla()->text());
+    });
+
     menu.exec(globalPos);
 }