style(auth-ui): remove ThemeToggle and default to light theme

Remove the ThemeToggle component, its associated tests, and its remaining usage in the split layout. Update the root ThemeProvider to default to "light" rather than "system".

Author: yahyafakhroji

app/components/theme-toggle/__tests__/theme-toggle.test.tsx

@@ -1,4 +1,3 @@
-import { ThemeToggle } from '@/components/theme-toggle/theme-toggle';
 import type { BrandingTheme } from '@/modules/auth/types';
 import { assetUrl } from '@/utils/asset-url';
 import { Avatar, AvatarFallback, AvatarImage } from '@datum-cloud/datum-ui/avatar';
@@ -28,7 +27,6 @@ export default function SplitLayout({
               <Logo.Flat aria-label="Datum" className="h-6 w-auto" tone="brand" />
             )}
           </Link>
-          <ThemeToggle />
         </div>
         <main className="flex w-full flex-1 items-center justify-center">
           <div className="w-full max-w-[400px]">{children}</div>

app/components/theme-toggle/theme-toggle.tsx

@@ -123,7 +123,7 @@ msgstr "Back"
 msgid "Back to sign in"
 msgstr "Back to sign in"
 
-#: app/layouts/split.layout.tsx:38
+#: app/layouts/split.layout.tsx:36
 msgid "By continuing, you agree to Datum's <0>Terms of Service</0> and <1>Privacy Policy</1>, and to receive periodic emails with updates."
 msgstr "By continuing, you agree to Datum's <0>Terms of Service</0> and <1>Privacy Policy</1>, and to receive periodic emails with updates."
 
@@ -437,7 +437,7 @@ msgstr "Phone sign-in isn't available — use your email or username."
 msgid "Please check your input and try again."
 msgstr "Please check your input and try again."
 
-#: app/layouts/split.layout.tsx:106
+#: app/layouts/split.layout.tsx:104
 msgid "Prefer a demo instead? Just <0>reach out</0>."
 msgstr "Prefer a demo instead? Just <0>reach out</0>."
 
@@ -594,7 +594,7 @@ msgstr "Something went wrong. Please try again."
 msgid "Start over"
 msgstr "Start over"
 
-#: app/layouts/split.layout.tsx:118
+#: app/layouts/split.layout.tsx:116
 msgid "Thanks,"
 msgstr "Thanks,"
 
@@ -680,7 +680,7 @@ msgstr "Use your security key to verify your identity."
 msgid "Username"
 msgstr "Username"
 
-#: app/layouts/split.layout.tsx:96
+#: app/layouts/split.layout.tsx:94
 msgid "Using Datum requires setting up a billing account, but to help you explore without cost, we add <0>$50 USD</0> in credit on signup."
 msgstr "Using Datum requires setting up a billing account, but to help you explore without cost, we add <0>$50 USD</0> in credit on signup."
 

app/layouts/split.layout.tsx

@@ -113,7 +113,7 @@ export default function App() {
   );
 
   return (
-    <ThemeProvider attribute="class" defaultTheme="system" enableSystem disableTransitionOnChange>
+    <ThemeProvider attribute="class" defaultTheme="light" enableSystem disableTransitionOnChange>
       <I18nProvider i18n={i18nInstance}>
         <ConformAdapter>
           <FathomAnalytics siteId={fathomSiteId} />