fix: compute macro targets dynamically from protein goal and body weight

Fat/carb percentages were stored as absolute values that didn't account
for protein g/kg varying with body weight. Now protein calories are
computed first, and remaining calories are split between fat and carbs
by their stored ratio — guaranteeing all macros sum to the calorie goal.

Exercise burned calories also flow into fat/carb targets via a new
effectiveCalorieGoal derived. Goal editor ring preview and labels
updated to show computed actual percentages.

src/lib/js/fitnessI18n.ts

@@ -282,8 +282,8 @@ const translations: Translations = {
 	protein_goal: { en: 'Protein goal', de: 'Proteinziel' },
 	protein_fixed: { en: 'Fixed (g/day)', de: 'Fest (g/Tag)' },
 	protein_per_kg: { en: 'Per kg bodyweight', de: 'Pro kg Körpergewicht' },
-	fat_percent: { en: 'Fat (%)', de: 'Fett (%)' },
-	carb_percent: { en: 'Carbs (%)', de: 'Kohlenhydrate (%)' },
+	fat_percent: { en: 'Fat ratio', de: 'Fett-Anteil' },
+	carb_percent: { en: 'Carbs ratio', de: 'KH-Anteil' },
 	kcal: { en: 'kcal', de: 'kcal' },
 	protein: { en: 'Protein', de: 'Protein' },
 	fat: { en: 'Fat', de: 'Fett' },