Enhance boot sequence: add boot_test_mode global variable; adjust backlight delay and update display logic for test mode

esphome/cat-medication-tracker.yaml

@@ -2,14 +2,26 @@ substitutions:
   name: cat-medication-tracker
   friendly_name: "Cat Medication Tracker"
 
+globals:
+  - id: boot_test_mode
+    type: bool
+    restore_value: false
+    initial_value: 'true'
+
 esphome:
   name: ${name}
   friendly_name: ${friendly_name}
   on_boot:
-    priority: -10
+    - priority: -10
       then:
         - light.turn_on: backlight
+        - delay: 300ms
+        - lambda: |-
+            id(boot_test_mode) = true;
+        - component.update: my_display
         - delay: 1s
+        - lambda: |-
+            id(boot_test_mode) = false;
         - component.update: my_display
 
 esp32:
@@ -79,9 +91,14 @@ display:
       height: 320
     id: my_display
     auto_clear_enabled: false
-    update_interval: 2s
+    update_interval: never
     color_palette: 8BIT
     lambda: |-
+      if (id(boot_test_mode)) {
+        it.fill(Color(0, 128, 255));
+        return;
+      }
+
       // Colors
       auto red = Color(255, 0, 0);
       auto green = Color(0, 200, 0);