Shadcn-style command row: pill chips, chevron breadcrumbs, left-elide

- Add ROUNDBOX pill indicators behind editable SRC and ADDR spans
- Switch breadcrumb separator from > to › (U+203A)
- Collapse deep paths (>4 parts) with ellipsis
- Left-elide breadcrumb path to keep current selection visible
- Clear base-addr indicator before repainting (prevents smear)
- Wire pill + addr decorators into setCommandRowText refresh

src/editor.h

@@ -115,6 +115,7 @@ private:
     void applyFoldLevels(const QVector<LineMeta>& meta);
     void applyHexDimming(const QVector<LineMeta>& meta);
     void applyBaseAddressColoring(const QVector<LineMeta>& meta);
+    void applyCommandRowPills();
 
     void commitInlineEdit();
     int  editEndCol() const;