Pass framebuffer rotation through DisplayDriverConfig (#11534)

* tftSetup: pass framebuffer rotation via DisplayDriverConfig

Replaces the MESHTASTIC_FB_ROTATION environment variable with
DisplayDriverConfig::rotation(), which device-ui reads in
FBDriver::create(const DisplayDriverConfig &).

* tftSetup: carry framebuffer rotation in the panel config

Use the DisplayDriverConfig builder with panel_config_t::offset_rotation
instead of a dedicated rotation setter. Width and height fall back to the
device-ui defaults when the yaml does not set them.

* tftSetup: pass the framebuffer panel config unfiltered

Take Display.Width, Display.Height and Display.OffsetRotate straight from
the portduino config, like the CUSTOM_TFT branch does.

src/graphics/tftSetup.cpp

@@ -15,8 +15,6 @@
 #endif
 
 #if defined(ARCH_PORTDUINO) || !defined(HAS_FREE_RTOS)
-#include <cstdio>
-#include <cstdlib>
 #include <thread>
 #endif
 
@@ -351,15 +349,11 @@ void tftSetup(void)
 #elif defined(USE_FRAMEBUFFER)
         if (portduino_config.displayPanel == fb) {
             // Rotation from yaml Display.OffsetRotate: 1=90, 2=180, 3=270 deg
-            char rbuf[4];
-            snprintf(rbuf, sizeof(rbuf), "%d", portduino_config.displayRotate ? (portduino_config.displayOffsetRotate & 3) : 0);
-            if (setenv("MESHTASTIC_FB_ROTATION", rbuf, 1) != 0)
-                LOG_ERROR("Failed to set MESHTASTIC_FB_ROTATION, framebuffer will use its default rotation");
-            if (portduino_config.displayWidth && portduino_config.displayHeight)
-                displayConfig = DisplayDriverConfig(DisplayDriverConfig::device_t::FB, (uint16_t)portduino_config.displayWidth,
-                                                    (uint16_t)portduino_config.displayHeight);
-            else
-                displayConfig.device(DisplayDriverConfig::device_t::FB);
+            displayConfig.device(DisplayDriverConfig::device_t::FB)
+                .panel(DisplayDriverConfig::panel_config_t{.type = panels[portduino_config.displayPanel],
+                                                           .panel_width = (uint16_t)portduino_config.displayWidth,
+                                                           .panel_height = (uint16_t)portduino_config.displayHeight,
+                                                           .offset_rotation = (uint8_t)portduino_config.displayOffsetRotate});
         } else
 #endif
         {