Fix trailing spaces and missing newlines in all mcu-*.yaml files

Bulk cleanup: remove trailing whitespace and ensure files end with a
newline. Structural issues (indentation, bracket spacing) left for
per-file fixes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mcu-tv-light.yaml

@@ -23,7 +23,7 @@ packages:
 # B 	      GPIO12 	PWM3
 # W1 	      GPIO14 	PWM4
 # W2 	      GPIO04 	PWM5
-# LED D1 R 	GPIO05 	
+# LED D1 R 	GPIO05
 # LED D2 G 	GPIO01
 
 light:
@@ -42,7 +42,7 @@ light:
           name: Slow Strobe
       - strobe:
           name: Fast Strobe
-          colors: 
+          colors:
             - state: true
               duration: 100ms
             - state: false
@@ -63,4 +63,4 @@ output:
     pin: GPIO14
   - platform: esp8266_pwm
     id: pwm_warm_white
-    pin: GPIO04
+    pin: GPIO04