feat: simplify cmd bar keyword, add File menu class/struct/enum, remove Align Members

- Command bar shows static keyword (struct/class/enum) without dropdown or colon
- Right-click keyword in cmd bar for class↔struct conversion (enum blocked)
- File menu: New Class (Ctrl+N), New Struct (Ctrl+T), New Enum (Ctrl+E)
- Project explorer right-click: New Class/Struct/Enum on Project node
- Explorer right-click: Convert to Class/Struct on class/struct items
- Remove Align Members submenu, performRealignment, computeStructAlignment
- Remove screenshot code and screenshot.png

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_compose.cpp

@@ -1920,54 +1920,9 @@ private slots:
         }
     }
 
-    void testComputeStructAlignment() {
-        NodeTree tree;
-        tree.baseAddress = 0;
-
-        Node root;
-        root.kind = NodeKind::Struct;
-        root.name = "Root";
-        root.parentId = 0;
-        int ri = tree.addNode(root);
-        uint64_t rootId = tree.nodes[ri].id;
-
-        // Int32 has alignment 4
-        Node f1;
-        f1.kind = NodeKind::Int32;
-        f1.name = "a";
-        f1.parentId = rootId;
-        f1.offset = 0;
-        tree.addNode(f1);
-
-        QCOMPARE(tree.computeStructAlignment(rootId), 4);
-
-        // Add Hex64 (alignment 8) — max should become 8
-        Node f2;
-        f2.kind = NodeKind::Hex64;
-        f2.name = "b";
-        f2.parentId = rootId;
-        f2.offset = 8;
-        tree.addNode(f2);
-
-        QCOMPARE(tree.computeStructAlignment(rootId), 8);
-    }
-
-    void testComputeStructAlignmentEmpty() {
-        NodeTree tree;
-        Node root;
-        root.kind = NodeKind::Struct;
-        root.name = "Empty";
-        root.parentId = 0;
-        int ri = tree.addNode(root);
-        uint64_t rootId = tree.nodes[ri].id;
-
-        // Empty struct → alignment 1
-        QCOMPARE(tree.computeStructAlignment(rootId), 1);
-    }
-
     void testCommandRowRootNameSpan() {
         // Name span should cover the class name in the merged command row
-        QString text = "source\u25BE \u00B7 0x0 \u00B7 struct\u25BE MyClass {";
+        QString text = "source\u25BE \u00B7 0x0 \u00B7 struct MyClass {";
         ColumnSpan nameSpan = commandRowRootNameSpan(text);
         QVERIFY(nameSpan.valid);
 

tests/test_editor.cpp

@@ -941,19 +941,13 @@ private slots:
 
         // Set CommandRow text with root class (simulates controller.updateCommandRow)
         m_editor->setCommandRowText(
-            QStringLiteral("source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct\u25BE _PEB64 {"));
+            QStringLiteral("source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct _PEB64 {"));
 
         // RootClassName should be allowed on CommandRow (line 0)
         bool ok = m_editor->beginInlineEdit(EditTarget::RootClassName, 0);
         QVERIFY2(ok, "RootClassName edit should be allowed on CommandRow");
         QVERIFY(m_editor->isEditing());
         m_editor->cancelInlineEdit();
-
-        // RootClassType should be allowed on CommandRow (line 0)
-        ok = m_editor->beginInlineEdit(EditTarget::RootClassType, 0);
-        QVERIFY2(ok, "RootClassType edit should be allowed on CommandRow");
-        QVERIFY(m_editor->isEditing());
-        m_editor->cancelInlineEdit();
     }
 
     // ── Test: CommandRow root class name editable ──
@@ -962,7 +956,7 @@ private slots:
 
         // Set CommandRow with root class
         m_editor->setCommandRowText(
-            QStringLiteral("source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct\u25BE _PEB64 {"));
+            QStringLiteral("source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct _PEB64 {"));
 
         // Line 0 is CommandRow
         const LineMeta* lm = m_editor->metaForLine(0);
@@ -1008,7 +1002,7 @@ private slots:
 
         // Set command row text (simulates controller.updateCommandRow)
         QString cmdText = QStringLiteral(
-            "source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct\u25BE _PEB64 {");
+            "source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct _PEB64 {");
         m_editor->setCommandRowText(cmdText);
         QApplication::processEvents();
 
@@ -1086,7 +1080,7 @@ private slots:
         m_editor->applyDocument(m_result);
 
         QString cmdText = QStringLiteral(
-            "source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct\u25BE _PEB64 {");
+            "source\u25BE \u00B7 0xD87B5E5000 \u00B7 struct _PEB64 {");
         m_editor->setCommandRowText(cmdText);
         QApplication::processEvents();
 

tests/test_type_selector.cpp

@@ -62,7 +62,7 @@ private slots:
     // ── Chevron span detection ──
 
     void testChevronSpanDetected() {
-        QString text = QStringLiteral("[\u25B8] source\u25BE \u00B7 0x1000 \u00B7 struct\u25BE Alpha {");
+        QString text = QStringLiteral("[\u25B8] source\u25BE \u00B7 0x1000 \u00B7 struct Alpha {");
         ColumnSpan span = commandRowChevronSpan(text);
         QVERIFY(span.valid);
         QCOMPARE(span.start, 0);
@@ -79,7 +79,7 @@ private slots:
     // ── Existing spans unbroken by chevron prefix ──
 
     void testSpansWithPrefix() {
-        QString text = QStringLiteral("[\u25B8] source\u25BE \u00B7 0x1000 \u00B7 struct\u25BE Alpha {");
+        QString text = QStringLiteral("[\u25B8] source\u25BE \u00B7 0x1000 \u00B7 struct Alpha {");
 
         ColumnSpan src = commandRowSrcSpan(text);
         QVERIFY(src.valid);