Dim command row address, fix source picker zoom/styling, lowercase menu items, margin spacing

- Apply IND_HEX_DIM to base address on command row so it matches source/struct grey
- Source picker QMenu respects Scintilla zoom level for font size
- Style source picker with dark theme selection color instead of system blue
- Disable blue selection background for picker-based edit targets (Source, Type, etc.)
- Rename menu items File/Process to file/process
- Add trailing space to margin offset text for breathing room

src/editor.h

@@ -45,7 +45,6 @@ public:
 
     void applySelectionOverlay(const QSet<uint64_t>& selIds);
     void setCommandRowText(const QString& line);
-    void setCommandRow2Text(const QString& line);
     void setEditorFont(const QString& fontName);
     static void setGlobalFontName(const QString& fontName);