Fix git credential helper setup

Scripts/base.sh

@@ -109,6 +109,19 @@ download_and_verify_release_asset() {
     rm -f "$checksum_file"
 }
 
+ensure_git_credential_helper() {
+    local helper_value="$1"
+    local existing_helpers=""
+
+    existing_helpers=$(git config --global --get-all credential.helper 2>/dev/null || true)
+
+    if printf '%s\n' "$existing_helpers" | grep -Fx -- "$helper_value" >/dev/null 2>&1; then
+        return 0
+    fi
+
+    git config --global --add credential.helper "$helper_value"
+}
+
 echo -e "${BLUE}    LOG:${YELLOW} Initializing Base System Layer...${NC}"
 
 # Confirm Architecture
@@ -383,9 +396,9 @@ mkdir -p "$ZSH_CUSTOM/plugins"
 # 5. Git Credentials (WSL Bridge)
 if is_wsl; then
     GCM_WIN="/mnt/c/Program Files/Git/mingw64/bin/git-credential-manager.exe"
-    [ -f "$GCM_WIN" ] && git config --global credential.helper "! \"$GCM_WIN\""
+    [ -f "$GCM_WIN" ] && ensure_git_credential_helper "! \"$GCM_WIN\""
 else
-    git config --global credential.helper 'cache --timeout=43200'
+    ensure_git_credential_helper 'cache --timeout=43200'
 fi
 
 # 6. Cleanup & Secrets