feat(core): show red error header when USB data not connected

core/.changelog.d/2366.added

@@ -1 +1 @@
-Show blue dot when USB data pins are not connected
+Show red error header when USB data pins are not connected

core/embed/unix/profile.c

@@ -66,3 +66,9 @@ const char *profile_sdcard_path(void) {
   FILE_PATH(_sdcard_path, "/trezor.sdcard");
   return _sdcard_path;
 }
+
+const char *profile_usb_disconnect_path(void) {
+  SVAR(_disconnect_path);
+  FILE_PATH(_disconnect_path, "/trezor.usb_data_disconnected");
+  return _disconnect_path;
+}

core/embed/unix/profile.h

@@ -33,5 +33,6 @@ const char *profile_name(void);
 const char *profile_dir(void);
 const char *profile_flash_path(void);
 const char *profile_sdcard_path(void);
+const char *profile_usb_disconnect_path(void);
 
 #endif  // __TREZOR_PROFILE_H__

core/embed/unix/usb.c

@@ -27,6 +27,7 @@
 #include <time.h>
 #include <unistd.h>
 
+#include "profile.h"
 #include "touch.h"
 #include "usb.h"
 
@@ -252,7 +253,7 @@ void pendsv_kbd_intr(void) {}
 void mp_hal_set_vcp_iface(int iface_num) {}
 
 secbool usb_configured(void) {
-  if (access("/var/tmp/trezor.usb_data_disconnected", F_OK) == 0) {
+  if (access(profile_usb_disconnect_path(), F_OK) == 0) {
     return secfalse;
   }
 

core/src/apps/homescreen/homescreen.py

@@ -68,7 +68,7 @@ class Homescreen(HomescreenBase):
         # Differs for each model
 
         if not utils.usb_data_connected():
-            ui.display.bar(0, 0, 8, 8, ui.BLUE)
+            ui.header_error("NO USB CONNECTION")
 
         # TODO: support homescreen avatar change for R and 1
         if utils.MODEL in ("T",):