{{/*
  Calculate percentage safely (avoids division by zero)

  Usage: {{ partial "calc-percent.html" (dict "numerator" 10 "denominator" 50) }}
  Returns: 20.0 (or 0 if denominator is 0)
*/}}
{{- $num := .numerator | default 0 -}}
{{- $den := .denominator | default 0 -}}
{{- $pct := 0.0 -}}

{{- if gt $den 0 -}}
  {{- $pct = mul (div (float $num) (float $den)) 100 -}}
{{- end -}}

{{- return $pct -}}