feat(niri/workspaces): add window icons via window-rewrite

Adds format-window-separator, window-rewrite and window-rewrite-default
options plus the {windows} format replacement to the niri/workspaces
module (rebased onto master; coexists with ignore-workspaces).

include/modules/niri/workspaces.hpp

@@ -9,6 +9,7 @@
 #include "AModule.hpp"
 #include "bar.hpp"
 #include "modules/niri/backend.hpp"
+#include "util/regex_collection.hpp" // Added for rewrite rules
 
 namespace waybar::modules::niri {
 
@@ -26,6 +27,10 @@ class Workspaces : public AModule, public EventHandler {
   std::string getIcon(const std::string& value, const Json::Value& ws);
   bool isWorkspaceIgnored(const std::string& name);
   bool handleScroll(GdkEventScroll* /*unused*/) override;
+  // Added for window rewrite
+  void populateWindowRewriteConfig();
+  void populateFormatWindowSeparatorConfig();
+  std::string getRewrite(const std::string& app_id, const std::string& title);
 
   const Bar& bar_;
   Gtk::Box box_;
@@ -37,6 +42,12 @@ class Workspaces : public AModule, public EventHandler {
   bool sort_by_id_ = false;
   bool sort_by_name_ = false;
   bool sort_by_coordinates_ = false;
+
+  // Added for window rewrite
+  util::RegexCollection m_windowRewriteRules;
+  std::string m_windowRewriteDefault;
+  std::string m_formatWindowSeparator;
+ 
 };
 
 }  // namespace waybar::modules::niri