Port display_gif_sd and display_speed_wifi to LVGL 9.6 + shared library

- both use shared/jc3636w518.ini, board library and perf monitor
- GIF decoded in the display color format, loop delay 1 ms,
  per-loop memory prints removed
- lv_conf: LVGL drive A: = SD card via LV_USE_FS_STDIO (/sdcard/)
- shared/README.md, CLAUDE.md and project README updated

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

10-OBD-Display-2024/display_gif_sd/src/main.cpp

@@ -1,5 +1,6 @@
 #include <Arduino.h>
-#include "scr_st77916.h"
+#include "jc3636w518.h"
+#include "perf_monitor.h"
 #include "SD_MMC.h"
 
 void my_print(const char* buf) {
@@ -9,7 +10,10 @@ void my_print(const char* buf) {
 void display_animation() {
   lv_obj_t* img;
 
-  img = lv_gif_create(lv_scr_act());
+  img = lv_gif_create(lv_screen_active());
+  // shown on a plain black screen: no transparency needed, so decode straight into the display's
+  // color format (no alpha blending, no conversion) to save CPU
+  lv_gif_set_color_format(img, lv_display_get_color_format(lv_display_get_default()));
 
   Serial.print("Available Heap before: ");
   Serial.println(esp_get_free_heap_size());
@@ -54,7 +58,7 @@ void display_text() {
   // lv_style_set_shadow_ofs_x(&style_text, 0);
   // lv_style_set_shadow_ofs_y(&style_text, 0);
 
-  lv_obj_t* label1 = lv_label_create(lv_scr_act());
+  lv_obj_t* label1 = lv_label_create(lv_screen_active());
 
   // Apply the style to the label
   lv_obj_add_style(label1, &style_text, LV_PART_MAIN);
@@ -70,14 +74,13 @@ void display_text() {
 void setup() {
   delay(200);
   Serial.begin(115200);
-  scr_lvgl_init();
-
-  lv_init();
+  lv_display_t* disp = scr_lvgl_init();
+  perf_monitor_begin(disp);
 
   //lv_log_register_print_cb(my_print);  // Register print function for LVGL logs
 
   // Get the active screen (root object for the display)
-  lv_obj_t* screen = lv_scr_act();
+  lv_obj_t* screen = lv_screen_active();
 
   // Set the background color of the entire screen to black
   lv_obj_set_style_bg_color(screen, lv_color_black(), 0);  // 0 is the part ID for the main part
@@ -105,13 +108,7 @@ void setup() {
 }
 
 void loop() {
-  lv_timer_handler();
-  vTaskDelay(5);
-
-  lv_mem_monitor_t mem_mon;
-  lv_mem_monitor(&mem_mon);
-  printf("Free memory: %d bytes\n", mem_mon.free_size);
-
-  Serial.print("Available Heap: ");
-  Serial.println(esp_get_free_heap_size());
+  perf_timer_handler();
+  vTaskDelay(1);
+  perf_monitor_print();
 }