refactor(AModule): hoist format/tooltip resolution to the base module

Move resolveTooltipFormat() (and add resolveFormat()) from ALabel down into
AModule, and add a generic updateTooltip(Gtk::Widget&, ...) helper. This lets
modules that are not ALabel-derived reuse the shared tooltip logic instead of
re-implementing it. Migrate gamemode (the only non-ALabel module reading
tooltip-format) to updateTooltip(box_, ...). ALabel inherits the resolvers.

include/ALabel.hpp

@@ -34,18 +34,7 @@ class ALabel : public AModule {
   bool setLabelMarkup(const Glib::ustring& markup);
   bool setTooltipMarkup(const Glib::ustring& markup);
 
-  // Resolve the tooltip format string: prefers `tooltip-format-<state>` (when a
-  // non-empty state is given), then `tooltip-format`, then `defaultFormat`.
-  std::string resolveTooltipFormat(const std::string& defaultFormat,
-                                   const std::string& state = "") const {
-    if (!state.empty() && config_["tooltip-format-" + state].isString()) {
-      return config_["tooltip-format-" + state].asString();
-    }
-    if (config_["tooltip-format"].isString()) {
-      return config_["tooltip-format"].asString();
-    }
-    return defaultFormat;
-  }
+  // resolveTooltipFormat() / resolveFormat() are inherited from AModule.
 
   // Combined label + tooltip helper. Builds a single fmt argument store from
   // `args`, renders `labelFormat` into the label and the resolved tooltip format

include/AModule.hpp

@@ -1,11 +1,16 @@
 #pragma once
 
+#include <fmt/args.h>
+#include <fmt/format.h>
 #include <glibmm/dispatcher.h>
 #include <glibmm/markup.h>
 #include <gtkmm.h>
 #include <gtkmm/eventbox.h>
 #include <json/json.h>
 
+#include <string>
+#include <utility>
+
 #include "IModule.hpp"
 
 namespace waybar {
@@ -40,6 +45,40 @@ class AModule : public IModule {
   SCROLL_DIR getScrollDir(GdkEventScroll* e);
   bool tooltipEnabled() const;
 
+  // --- Generic format/tooltip resolution (config-only, usable by any module,
+  // ALabel-derived or not). Prefers `<key>-<state>`, then `<key>`, then default.
+  std::string resolveFormat(const std::string& defaultFormat, const std::string& state = "") const {
+    if (!state.empty() && config_["format-" + state].isString()) {
+      return config_["format-" + state].asString();
+    }
+    if (config_["format"].isString()) {
+      return config_["format"].asString();
+    }
+    return defaultFormat;
+  }
+  std::string resolveTooltipFormat(const std::string& defaultFormat,
+                                   const std::string& state = "") const {
+    if (!state.empty() && config_["tooltip-format-" + state].isString()) {
+      return config_["tooltip-format-" + state].asString();
+    }
+    if (config_["tooltip-format"].isString()) {
+      return config_["tooltip-format"].asString();
+    }
+    return defaultFormat;
+  }
+
+  // Generic tooltip for any widget: honors the `tooltip` toggle and
+  // `tooltip-format`, formats with the given args and applies it. Lets modules
+  // that are not ALabel-derived (e.g. gamemode) reuse the shared logic.
+  template <typename... Args>
+  void updateTooltip(Gtk::Widget& widget, const std::string& defaultFormat, Args&&... args) {
+    if (!tooltipEnabled()) {
+      return;
+    }
+    widget.set_tooltip_markup(
+        fmt::format(fmt::runtime(resolveTooltipFormat(defaultFormat)), std::forward<Args>(args)...));
+  }
+
   std::vector<int> pid_children_;
   const std::string name_;
   const Json::Value& config_;

src/modules/gamemode.cpp

@@ -210,10 +210,7 @@ auto Gamemode::update() -> void {
   lastStatus = status;
 
   // Tooltip
-  if (tooltip) {
-    std::string text = fmt::format(fmt::runtime(tooltip_format), fmt::arg("count", gameCount));
-    box_.set_tooltip_markup(text);
-  }
+  updateTooltip(box_, tooltip_format, fmt::arg("count", gameCount));
 
   // Label format
   std::string str = fmt::format(fmt::runtime(showAltText ? format_alt : format),