chore(simple-message-app): remove theme setting and setupTheme call

- Remove theme from screenly.yml and screenly_qc.yml since it's a platform-level setting
- Remove setupTheme() import and call from main.ts as it's not needed
- Remove theme from e2e screenshot fixture
- Remove theme row from README settings table

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

Author: nicomiguelino

edge-apps/simple-message-app/README.md

@@ -28,7 +28,6 @@ The app accepts the following settings via `screenly.yml`:
 | `override_locale`   | Override the default locale using a [BCP 47](https://developer.mozilla.org/en-US/docs/Web/Localization/Locale_identification_and_negotiation#locale_identifiers) locale tag (e.g., `en`, `en-GB`, `fr`, `fr-CA`, `de`) | optional | `en`                 |
 | `override_timezone` | Override the default timezone using an [IANA time zone identifier](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) (e.g., `Europe/London`, `America/New_York`). Defaults to the system timezone if left blank | optional | -                    |
 | `tag_manager_id`    | Google Tag Manager container ID to enable tracking and analytics                                                                                                                                                            | optional | `GTM-P98SPZ9Z`       |
-| `theme`             | Visual theme for the application (`light` or `dark`)                                                                                                                                                                        | required | `light`              |
 
 ## Development
 

edge-apps/simple-message-app/e2e/screenshots.spec.ts

@@ -18,7 +18,6 @@ const { screenlyJsContent } = createMockScreenlyForScreenshots(
     override_locale: 'en',
     override_timezone: 'America/New_York',
     tag_manager_id: 'GTM-P98SPZ9Z',
-    theme: 'light',
   },
 )
 

edge-apps/simple-message-app/screenly.yml

@@ -57,10 +57,3 @@ settings:
     help_text: |
       Enter your Google Tag Manager container ID to enable tracking and analytics.
     is_global: true
-  theme:
-    type: string
-    default_value: light
-    title: Theme
-    optional: false
-    help_text: |
-      Select the visual theme for the application ('light' or 'dark').

edge-apps/simple-message-app/screenly_qc.yml

@@ -57,10 +57,3 @@ settings:
     help_text: |
       Enter your Google Tag Manager container ID to enable tracking and analytics.
     is_global: true
-  theme:
-    type: string
-    default_value: light
-    title: Theme
-    optional: false
-    help_text: |
-      Select the visual theme for the application ('light' or 'dark').

edge-apps/simple-message-app/src/main.ts

@@ -6,7 +6,6 @@ import {
   getSettingWithDefault,
   getTimeZone,
   setupErrorHandling,
-  setupTheme,
   signalReady,
 } from '@screenly/edge-apps'
 
@@ -46,6 +45,5 @@ export default async function init() {
 
 document.addEventListener('DOMContentLoaded', async () => {
   setupErrorHandling()
-  setupTheme()
   await init()
 })