Develop team (#1)

* draft

* Adjust IME candidate scrolling and space behavior

* Remove IME buffer label and update remaining counter

* Align Meshtastic handling and stabilize chat UI

- Align Meshtastic send/receive flow: add routing ACK decoding/log mapping, ack timeouts, channel tracking, and richer RX/TX diagnostics.

- Persist and manage PKI peer keys; add PKI backoff on NO_CHANNEL/UNKNOWN_PUBKEY and fall back to PSK when needed.

- Improve chat UI state handling: safer app switching with exit callbacks, active app clearing on menu return, and safer chat container cleanup.

- Fix Contacts → Compose parent selection to avoid UI tree mismatch; add broadcast compose support and refine action button behavior.

- Add UI debug logging for screen/parent validity and child counts to diagnose black-screen/stacking issues.

- Apply timezone offset helpers for display-time formatting and reuse in screenshot timestamps.

* Add changelog entry and time helpers

src/main.cpp

@@ -20,6 +20,7 @@ extern "C"
     extern const lv_image_dsc_t Chat;
     extern const lv_image_dsc_t Setting;
     extern const lv_image_dsc_t contact;
+    extern const lv_image_dsc_t team_icon;
     extern const lv_image_dsc_t shutdown;
     // Note: img_usb is already declared in images.h (C++ linkage)
 }
@@ -30,11 +31,18 @@ extern "C"
 
 // Forward declarations for app entry functions (implemented in ui_*.cpp)
 void ui_gps_enter(lv_obj_t* parent);
+void ui_gps_exit(lv_obj_t* parent);
 void ui_chat_enter(lv_obj_t* parent);
+void ui_chat_exit(lv_obj_t* parent);
 void ui_contacts_enter(lv_obj_t* parent);
+void ui_contacts_exit(lv_obj_t* parent);
+void ui_team_enter(lv_obj_t* parent);
+void ui_team_exit(lv_obj_t* parent);
 void ui_setting_enter(lv_obj_t* parent);
+void ui_setting_exit(lv_obj_t* parent);
 #ifdef ARDUINO_USB_MODE
 void ui_usb_enter(lv_obj_t* parent);
+void ui_usb_exit(lv_obj_t* parent);
 #endif
 
 // GPS data access - now provided by GpsService
@@ -81,29 +89,37 @@ typedef struct
     void* user_data;
 } app_t;
 
+static app_t* s_active_app = nullptr;
+
 // App entry functions (implemented in ui_*.cpp files, global scope)
 
 app_t ui_gps_main = {
     .setup_func_cb = ui_gps_enter,
-    .exit_func_cb = nullptr,
+    .exit_func_cb = ui_gps_exit,
     .user_data = nullptr,
 };
 
 app_t ui_chat_main = {
     .setup_func_cb = ui_chat_enter,
-    .exit_func_cb = nullptr,
+    .exit_func_cb = ui_chat_exit,
     .user_data = nullptr,
 };
 
 app_t ui_contacts_main = {
     .setup_func_cb = ui_contacts_enter,
-    .exit_func_cb = nullptr,
+    .exit_func_cb = ui_contacts_exit,
+    .user_data = nullptr,
+};
+
+app_t ui_team_main = {
+    .setup_func_cb = ui_team_enter,
+    .exit_func_cb = ui_team_exit,
     .user_data = nullptr,
 };
 
 app_t ui_setting_main = {
     .setup_func_cb = ui_setting_enter,
-    .exit_func_cb = nullptr,
+    .exit_func_cb = ui_setting_exit,
     .user_data = nullptr,
 };
 
@@ -124,21 +140,21 @@ app_t ui_shutdown_main = {
 #ifdef ARDUINO_USB_MODE
 app_t ui_usb_main = {
     .setup_func_cb = ui_usb_enter,
-    .exit_func_cb = nullptr,
+    .exit_func_cb = ui_usb_exit,
     .user_data = nullptr,
 };
 #endif
 
 #ifdef ARDUINO_USB_MODE
-const char* kAppNames[6] = {"GPS", "Chat", "Contacts", "USB Mass Storage", "Setting", "Shutdown"};
-const lv_image_dsc_t* kAppImages[6] = {&gps_icon, &Chat, &contact, &img_usb, &Setting, &shutdown};
-app_t* kAppFuncs[6] = {&ui_gps_main, &ui_chat_main, &ui_contacts_main, &ui_usb_main, &ui_setting_main, &ui_shutdown_main};
-#define NUM_APPS 6
+const char* kAppNames[7] = {"GPS", "Chat", "Contacts", "Team", "USB Mass Storage", "Setting", "Shutdown"};
+const lv_image_dsc_t* kAppImages[7] = {&gps_icon, &Chat, &contact, &team_icon, &img_usb, &Setting, &shutdown};
+app_t* kAppFuncs[7] = {&ui_gps_main, &ui_chat_main, &ui_contacts_main, &ui_team_main, &ui_usb_main, &ui_setting_main, &ui_shutdown_main};
+#define NUM_APPS 7
 #else
-const char* kAppNames[5] = {"GPS", "Chat", "Contacts", "Setting", "Shutdown"};
-const lv_image_dsc_t* kAppImages[5] = {&gps_icon, &Chat, &contact, &Setting, &shutdown};
-app_t* kAppFuncs[5] = {&ui_gps_main, &ui_chat_main, &ui_contacts_main, &ui_setting_main, &ui_shutdown_main};
-#define NUM_APPS 5
+const char* kAppNames[6] = {"GPS", "Chat", "Contacts", "Team", "Setting", "Shutdown"};
+const lv_image_dsc_t* kAppImages[6] = {&gps_icon, &Chat, &contact, &team_icon, &Setting, &shutdown};
+app_t* kAppFuncs[6] = {&ui_gps_main, &ui_chat_main, &ui_contacts_main, &ui_team_main, &ui_setting_main, &ui_shutdown_main};
+#define NUM_APPS 6
 #endif
 
 #if LVGL_VERSION_MAJOR == 9
@@ -205,9 +221,13 @@ static void create_app(lv_obj_t* parent, const char* name, const lv_image_dsc_t*
         }
         if (c == LV_EVENT_CLICKED) {
             set_default_group(app_g);
+            if (s_active_app && s_active_app != func_cb && s_active_app->exit_func_cb) {
+                (*s_active_app->exit_func_cb)(parent);
+            }
             if (func_cb->setup_func_cb) {
                 (*func_cb->setup_func_cb)(parent);
             }
+            s_active_app = func_cb;
             menu_hidden();
         } },
         LV_EVENT_CLICKED, app_fun);
@@ -229,6 +249,10 @@ void menu_name_label_event_cb(lv_event_t* e)
 // App entry functions are implemented in ui_gps.cpp, ui_chat.cpp, ui_setting.cpp
 
 } // namespace
+void ui_clear_active_app()
+{
+    s_active_app = nullptr;
+}
 
 // GPS data access - now provided by TLoRaPagerBoard
 // GPS data collection task is now in TLoRaPagerBoard class