Keep user-managed Dim and Kimi launchers and write Claude settings through fresh private files

test/shell.d/setup-claude-api-test.sh

@@ -25,6 +25,8 @@ run_setup() {
 }
 
 echo '{"theme":"dark","env":{"KEEP_ME":"1"}}' >"$settings"
+chmod 644 "$settings"
+install -m 644 /dev/null "$settings.tmp"
 echo '{"userID":"abc"}' >"$HOME/.claude.json"
 run_setup DeepSeek sk-test "deepseek-flash[1m]"