refactor(web): clean up review findings from Preact port

- Remove duplicate style attribute on happy image preload in templ
- Remove unused getAvailableLanguages function from main.tsx
- Add type annotation to currentLang variable
- Add null check for missing challenge data with localized error

Assisted-by: Claude Opus 4.6 via Claude Code
Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/challenge/proofofwork/proofofwork.templ

@@ -7,7 +7,7 @@ import (
 
 templ page(localizer *localization.SimpleLocalizer) {
 	<div class="centered-div">
-		<img style="display:none;" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version }/>
+		<img style="display:none;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version }/>
 		<div id="app">
 			<img style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
 			<p id="status">{ localizer.T("loading") }</p>

lib/challenge/proofofwork/proofofwork_templ.go

@@ -34,14 +34,14 @@ func page(localizer *localization.SimpleLocalizer) templ.Component {
 			templ_7745c5c3_Var1 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<div class=\"centered-div\"><img style=\"display:none;\" style=\"width:100%;max-width:256px;\" src=\"")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<div class=\"centered-div\"><img style=\"display:none;\" src=\"")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var2 string
 		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 10, Col: 174}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 10, Col: 138}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var2))
 		if templ_7745c5c3_Err != nil {

web/js/main.tsx

@@ -27,31 +27,6 @@ const imageURL = (
     cacheBuster,
   });
 
-// Detect available languages by loading the manifest
-const getAvailableLanguages = async () => {
-  const basePrefix = j("anubis_base_prefix");
-  if (basePrefix === null) {
-    return;
-  }
-
-  try {
-    const response = await fetch(
-      `${basePrefix}/.within.website/x/cmd/anubis/static/locales/manifest.json`,
-    );
-    if (response.ok) {
-      const manifest = await response.json();
-      return manifest.supportedLanguages || ["en"];
-    }
-  } catch (error) {
-    console.warn(
-      "Failed to load language manifest, falling back to default languages",
-    );
-  }
-
-  // Fallback to default languages if manifest loading fails
-  return ["en"];
-};
-
 // Use the browser language from the HTML lang attribute which is set by the server settings or request headers
 const getBrowserLanguage = async () => document.documentElement.lang;
 
@@ -91,7 +66,7 @@ const getRedirectUrl = () => {
 };
 
 let translations: Record<string, string> = {};
-let currentLang;
+let currentLang: string;
 
 // Initialize translations
 const initTranslations = async () => {
@@ -179,7 +154,16 @@ function App({ anubisVersion, basePrefix }: AppProps) {
       }
     }
 
-    const { challenge, rules } = j("anubis_challenge");
+    const challengeData = j("anubis_challenge");
+    if (!challengeData) {
+      showError(
+        t("challenge_error"),
+        t("challenge_data_missing"),
+        imageURL("reject", anubisVersion, basePrefix),
+      );
+      return;
+    }
+    const { challenge, rules } = challengeData;
 
     const process = algorithms[rules.algorithm];
     if (!process) {