KindFlags refactor, indicator helpers, auto-padding, sizeof format fix

- Add KindFlags bitmask enum (KF_HexPreview, KF_Container, KF_String, KF_Vector)
- Add helper functions: isHexPreview(), flagsFor(), allTypeNamesForUI()
- Add editor helpers: clearIndicatorLine(), fillIndicatorCols(), resolvedSpanFor()
- Use SCI_FINDCOLUMN for UTF-8 safe column-to-position conversion
- Auto-emit hex padding nodes when changing type to smaller size
- Fix struct footer format: sizeof(Name)=0x... (no spaces)
- Add tests for sizeof recalculation after node deletion
- Add debug output to investigate sizeof refresh issue
- Replace icons.qrc with resources.qrc, add embedded fonts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/controller.h

@@ -64,7 +64,7 @@ public:
     void insertNode(uint64_t parentId, int offset, NodeKind kind, const QString& name);
     void removeNode(int nodeIdx);
     void toggleCollapse(int nodeIdx);
-    void setNodeValue(int nodeIdx, int subLine, const QString& text);
+    void setNodeValue(int nodeIdx, int subLine, const QString& text, bool isAscii = false);
     void duplicateNode(int nodeIdx);
     void showContextMenu(RcxEditor* editor, int line, int nodeIdx, int subLine, const QPoint& globalPos);
     void batchRemoveNodes(const QVector<int>& nodeIndices);
@@ -81,6 +81,7 @@ public:
     QSet<uint64_t> selectedIds() const { return m_selIds; }
 
     RcxDocument* document() const { return m_doc; }
+    void setEditorFont(const QString& fontName);
 
 signals:
     void nodeSelected(int nodeIdx);