🔧 Add, update TFT sanity checks (#22928)

Marlin/src/inc/Conditionals_LCD.h

 #if ANY(FSMC_GRAPHICAL_TFT, SPI_GRAPHICAL_TFT, TFT_320x240, TFT_480x320, TFT_320x240_SPI, TFT_480x320_SPI, TFT_LVGL_UI_FSMC, TFT_LVGL_UI_SPI)
   #define IS_LEGACY_TFT 1
   #define TFT_GENERIC
-  #warning "Don't forget to update your TFT settings in Configuration.h."
 #endif
 
 #if ANY(FSMC_GRAPHICAL_TFT, TFT_320x240, TFT_480x320, TFT_LVGL_UI_FSMC)

Marlin/src/inc/SanityCheck.h

 
 #undef IS_U8GLIB_SSD1306
 #undef IS_EXTUI
-#undef IS_LEGACY_TFT
 
 #if ANY(TFT_GENERIC, MKS_TS35_V2_0, MKS_ROBIN_TFT24, MKS_ROBIN_TFT28, MKS_ROBIN_TFT32, MKS_ROBIN_TFT35, MKS_ROBIN_TFT43, MKS_ROBIN_TFT_V1_1R, TFT_TRONXY_X5SA, ANYCUBIC_TFT35, ANYCUBIC_TFT35, LONGER_LK_TFT28, ANET_ET4_TFT28, ANET_ET5_TFT35, BIQU_BX_TFT70)
   #if NONE(TFT_COLOR_UI, TFT_CLASSIC_UI, TFT_LVGL_UI)
     #error "TFT_COLOR_UI, TFT_CLASSIC_UI, TFT_LVGL_UI is required for your TFT. Please enable one."
-  #elif 1 < ENABLED(TFT_COLOR_UI) + ENABLED(TFT_CLASSIC_UI) + ENABLED(TFT_LVGL_UI)
+  #elif MANY(TFT_COLOR_UI, TFT_CLASSIC_UI, TFT_LVGL_UI)
     #error "Please select only one of TFT_COLOR_UI, TFT_CLASSIC_UI, or TFT_LVGL_UI."
   #endif
 #elif ANY(TFT_COLOR_UI, TFT_CLASSIC_UI, TFT_LVGL_UI)
   #error "Please select only one of TFT_RES_320x240, TFT_RES_480x272, TFT_RES_480x320, or TFT_RES_1024x600."
 #endif
 
-#if HAS_TFT_LVGL_UI && DISABLED(TFT_RES_480x320)
-  #error "(FMSC|SPI)TFT_LVGL_UI requires TFT_RES_480x320."
+#if ENABLED(TFT_LVGL_UI)
+  #if DISABLED(TFT_RES_480x320)
+    #error "TFT_LVGL_UI requires TFT_RES_480x320."
+  #elif DISABLED(SDSUPPORT)
+    #error "TFT_LVGL_UI requires SDSUPPORT."
+  #endif
 #endif
 
 #if defined(GRAPHICAL_TFT_UPSCALE) && !WITHIN(GRAPHICAL_TFT_UPSCALE, 2, 4)

Marlin/src/inc/Warnings.cpp

   #endif
 #endif
 
+#if IS_LEGACY_TFT
+  #warning "Don't forget to update your TFT settings in Configuration.h."
+#endif
+
 // Ender 3 Pro (but, apparently all Creality 4.2.2 boards)
 #if ENABLED(EMIT_CREALITY_422_WARNING) || MB(CREALITY_V4)
   #warning "Creality 4.2.2 boards may have A4988 or TMC2208_STANDALONE drivers. Check your board and make sure to select the correct DRIVER_TYPE!"