feat: add directional window resize constants and multi-battery monitoring with per-battery breakdown in panel

include/dwn.h

@@ -25,6 +25,11 @@
 #define MAX_NOTIFICATIONS 32
 #define MAX_KEYBINDINGS 64
 
+#define RESIZE_LEFT   1
+#define RESIZE_RIGHT  2
+#define RESIZE_TOP    4
+#define RESIZE_BOTTOM 8
+
 #define DEFAULT_BORDER_WIDTH 0
 #define DEFAULT_TITLE_HEIGHT 28
 #define DEFAULT_PANEL_HEIGHT 32
@@ -168,6 +173,7 @@ typedef struct {
     int drag_orig_x, drag_orig_y;
     int drag_orig_w, drag_orig_h;
     bool resizing;
+    int drag_direction;
 
     Client *pending_focus_client;
     long pending_focus_time;

include/systray.h

@@ -11,6 +11,7 @@
 #include <stdbool.h>
 
 #define MAX_TRAY_ICONS 32
+#define MAX_BATTERIES 4
 #define TRAY_ICON_SIZE 22
 #define TRAY_ICON_SPACING 4
 
@@ -59,6 +60,22 @@ typedef struct {
     int time_remaining;
 } BatteryState;
 
+typedef struct {
+    char name[32];
+    bool present;
+    bool charging;
+    int percentage;
+    unsigned long energy_now;
+    unsigned long energy_full;
+} SingleBattery;
+
+typedef struct {
+    int count;
+    SingleBattery batteries[MAX_BATTERIES];
+    bool any_charging;
+    int combined_percentage;
+} MultiBatteryState;
+
 typedef struct {
     Window window;
     int x, y;
@@ -70,6 +87,7 @@ typedef struct {
 extern WifiState wifi_state;
 extern AudioState audio_state;
 extern BatteryState battery_state;
+extern MultiBatteryState multi_battery_state;
 extern VolumeSlider *volume_slider;
 
 void systray_init(void);
@@ -106,6 +124,7 @@ void systray_lock(void);
 void systray_unlock(void);
 
 BatteryState systray_get_battery_snapshot(void);
+MultiBatteryState systray_get_multi_battery_snapshot(void);
 AudioState systray_get_audio_snapshot(void);
 
 void xembed_init(void);