diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index f756607..366f6ae 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -116,7 +116,9 @@
       "Bash(cp /mnt/data/Development/GitLite/PKGBUILD .)",
       "Bash(sed -i 's/^pkgrel=1/pkgrel=3/' PKGBUILD)",
       "Bash(node -e \"const fs=require\\('fs'\\); const version='2026.8.1'; const pkgbuild=fs.readFileSync\\('PKGBUILD','utf8'\\).replace\\(/^pkgver=.*\\\\$/m, 'pkgver='+version\\).replace\\(/^pkgrel=.*\\\\$/m, 'pkgrel=1'\\); fs.writeFileSync\\('PKGBUILD', pkgbuild\\);\")",
-      "Bash(rm PKGBUILD)"
+      "Bash(rm PKGBUILD)",
+      "Bash(git -C /mnt/data/Development/GitLite stash)",
+      "Bash(git -C /mnt/data/Development/GitLite stash pop)"
     ]
   }
 }
diff --git a/src-tauri/src/git.rs b/src-tauri/src/git.rs
index c0d13fd..259b768 100644
--- a/src-tauri/src/git.rs
+++ b/src-tauri/src/git.rs
@@ -300,6 +300,10 @@ static CANCELLABLE_GIT_OUTPUT_COUNTER: AtomicU64 = AtomicU64::new(0);
 
 fn git_command() -> Command {
     let mut command = Command::new("git");
+    // Force English output regardless of the system locale, so is_auth_error()
+    // and other message heuristics keep working (e.g. German git prints
+    // "Authentifizierung fehlgeschlagen" instead of "Authentication failed").
+    command.env("LC_ALL", "C");
     #[cfg(windows)]
     command.creation_flags(CREATE_NO_WINDOW);
     command
@@ -4484,6 +4488,9 @@ fn is_auth_error(details: &str) -> bool {
         || d.contains(" 401")
         || d.contains("authorization failed")
         || d.contains("authentication required")
+        // Server-side message (e.g. Gitea/Forgejo: "remote: Failed to
+        // authenticate user"), independent of the local git locale.
+        || d.contains("failed to authenticate")
 }
 
 // Windows' CreateProcess rejects command lines longer than ~32K chars with
diff --git a/src/App.svelte b/src/App.svelte
index bcd419a..71fc2d8 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -144,6 +144,7 @@
     isCredentialExpired,
     isAuthError,
     stripAuthPrefix,
+    summarizeGitError,
   } from "./lib/credentials";
   import { trackAnalyticsEvent, type AnalyticsEventProperties } from "./lib/analytics";
 
@@ -1997,7 +1998,10 @@
         setCloneDialogError("");
         if (fromStore) {
           if (credentialKey) void credDelete(credentialKey).catch(() => {});
-          credDialogError = "Credentials were rejected or have expired. Please sign in again.";
+          const detail = summarizeGitError(message);
+          credDialogError = detail
+            ? `${detail} — please sign in again.`
+            : "Credentials were rejected or have expired. Please sign in again.";
         } else {
           credDialogError = message || "Sign-in is required to clone this repository.";
         }
@@ -2596,8 +2600,10 @@
     if (fromStore) {
       if (auth) {
         if (key) void credDelete(key).catch(() => {});
-        credDialogError =
-          "Credentials were rejected or have expired. Please sign in again.";
+        const detail = summarizeGitError(message);
+        credDialogError = detail
+          ? `${detail} — please sign in again.`
+          : "Credentials were rejected or have expired. Please sign in again.";
         credDialogAction = action;
         credDialogKey = key;
         credDialogOpen = true;
diff --git a/src/lib/credentials.ts b/src/lib/credentials.ts
index 558b867..8eab5e2 100644
--- a/src/lib/credentials.ts
+++ b/src/lib/credentials.ts
@@ -55,3 +55,17 @@ export function stripAuthPrefix(message: string): string {
     ? message.slice(AUTH_PREFIX.length).trim()
     : message;
 }
+
+/**
+ * Condenses raw git stderr to the single most relevant line for the
+ * credential dialog. Prefers the server's own explanation ("remote: ...")
+ * over git's generic wrapper ("fatal: Authentication failed for ...").
+ */
+export function summarizeGitError(message: string): string {
+  const lines = message
+    .split("\n")
+    .map((line) => line.trim())
+    .filter(Boolean);
+  const remote = lines.find((line) => line.toLowerCase().startsWith("remote:"));
+  return remote ?? lines[0] ?? "";
+}