Fix build: restore global File alias hidden by TFT_eSPI's FS_NO_GLOBALS

TFT_eSPI's default User_Setup.h enables SMOOTH_FONT, which makes it
define FS_NO_GLOBALS before including FS.h. Any TU that includes
ST7735Display.h before SPIFFS.h/FS.h (e.g. simple_repeater MyMesh.h via
target.h) then loses the global File/FS aliases and fails to compile.
Re-export the fs:: aliases right after including TFT_eSPI.h.

src/helpers/ui/ST7735Display.h

@@ -6,6 +6,18 @@
 #include "TFT_eSPI.h"
 #include <helpers/RefCountedDigitalPin.h>
 
+#if defined(ESP32) && defined(FS_NO_GLOBALS)
+// TFT_eSPI with SMOOTH_FONT defines FS_NO_GLOBALS before including FS.h,
+// which suppresses the global aliases the rest of the codebase relies on.
+#include <FS.h>
+using fs::FS;
+using fs::File;
+using fs::SeekMode;
+using fs::SeekSet;
+using fs::SeekCur;
+using fs::SeekEnd;
+#endif
+
 class ST7735Display : public DisplayDriver {
   bool _isOn;
   RefCountedDigitalPin* _peripher_power;