Refactor boot sequence: remove boot_test_mode global variable; simplify backlight control and update display logic

esphome/cat-medication-tracker.yaml

@@ -2,27 +2,16 @@ 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
-      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
+    then:
+      - light.turn_on:
+          id: backlight
+          brightness: 100%
+      - delay: 1s
+      - component.update: my_display
 
 esp32:
   board: esp32dev
@@ -91,14 +80,9 @@ display:
       height: 320
     id: my_display
     auto_clear_enabled: false
-    update_interval: never
+    update_interval: 1s
     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);