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-nspanel-fireplace.yaml

@@ -31,7 +31,7 @@ external_components:
       url: https://github.com/sairon/esphome-nspanel-lovelace-ui
       ref: dev
     components: [nspanel_lovelace]
-  
+
 packages:
   common: !include common/common.yaml
 
@@ -61,7 +61,7 @@ api:
       then:
         - lambda: |-
             id(nspanel_id).upload_tft("${tft_url}");
-            
+
     - service: upload_tft
       variables:
         url: string
@@ -294,6 +294,6 @@ sensor:
       reference_temperature: 25°C
       reference_resistance: 10kOhm
     name: "Living Room Temperature"
-    
+
   - platform: template
     id: room_temperature_id