feat(marketing): pricing 3 forfaits + ROI calculator Alpine.js

static/js/roi_calculator.js

@@ -0,0 +1,22 @@
+// ROI calculator for DictIA pricing section.
+// Hypotheses transparentes (cf. footnote dans landing.html) :
+//   - 80% du temps de transcription manuelle est économisé
+//   - 220 jours ouvrables/an
+//   - Coût annuel comparé = DictIA 16 = 5 750 $ + (201 $ × 12) = 8 162 $
+function roiCalculator() {
+  return {
+    users: 5,
+    hours: 2,
+    rate: 200,
+    get savings() {
+      const hoursSaved = this.users * this.hours * 0.8 * 220;
+      return Math.round(hoursSaved * this.rate);
+    },
+    get payback() {
+      const annualCost = 5750 + (201 * 12);
+      if (this.savings <= 0) return 999;
+      return Math.max(1, Math.round((annualCost / this.savings) * 12));
+    }
+  };
+}
+window.roiCalculator = roiCalculator;