feat: add time offset configuration

template/sysroot/include/Api/Syscall.hpp

@@ -113,6 +113,13 @@ namespace Montauk {
     static constexpr uint64_t SYS_BTLIST       = 87;
     static constexpr uint64_t SYS_BTINFO       = 88;
 
+    // Power management
+    static constexpr uint64_t SYS_SUSPEND      = 89;
+
+    // Timezone
+    static constexpr uint64_t SYS_SETTZ         = 90;
+    static constexpr uint64_t SYS_GETTZ         = 91;
+
     // Audio control commands (for SYS_AUDIOCTL)
     static constexpr int AUDIO_CTL_SET_VOLUME = 0;
     static constexpr int AUDIO_CTL_GET_VOLUME = 1;

template/sysroot/include/gui/desktop.hpp

@@ -52,6 +52,7 @@ struct DesktopSettings {
     bool show_shadows;      // window shadows on/off
     bool clock_24h;         // 24-hour clock format
     int ui_scale;           // 0=Small, 1=Default, 2=Large
+    int tz_offset_minutes;  // timezone offset from UTC in minutes
 };
 
 struct DesktopState {

template/sysroot/include/montauk/syscall.h

@@ -249,6 +249,10 @@ namespace montauk {
     // Timekeeping (wall-clock)
     inline void gettime(Montauk::DateTime* out) { syscall1(Montauk::SYS_GETTIME, (uint64_t)out); }
 
+    // Timezone offset (total minutes from UTC)
+    inline void settz(int offset_minutes) { syscall1(Montauk::SYS_SETTZ, (uint64_t)(int64_t)offset_minutes); }
+    inline int gettz() { return (int)syscall0(Montauk::SYS_GETTZ); }
+
     // Random number generation
     inline int64_t getrandom(void* buf, uint32_t len) {
         return syscall2(Montauk::SYS_GETRANDOM, (uint64_t)buf, (uint64_t)len);