fix: change GoalPlan int fields to int64 to match sub template func

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/finance/services/api/main/handler.go

@@ -1423,21 +1423,21 @@ func (h *Handler) Goals(w http.ResponseWriter, r *http.Request) {
 			remaining = 0
 		}
 
-		monthsLeft := monthsBetween(now, g.Deadline)
+		monthsLeft := int64(monthsBetween(now, g.Deadline))
 		if monthsLeft < 1 {
 			monthsLeft = 1
 		}
 
-		monthlyCents := remaining / int64(monthsLeft)
+		monthlyCents := remaining / monthsLeft
 
-		monthsAtRate := 0
+		monthsAtRate := int64(0)
 		if avgMonthlySavings > 0 {
-			monthsAtRate = int(remaining / avgMonthlySavings)
+			monthsAtRate = remaining / avgMonthlySavings
 		}
 
-		progressPct := 0
+		progressPct := int64(0)
 		if g.TargetCents > 0 {
-			progressPct = int(float64(g.SavedCents) / float64(g.TargetCents) * 100)
+			progressPct = int64(float64(g.SavedCents) / float64(g.TargetCents) * 100)
 			if progressPct > 100 {
 				progressPct = 100
 			}

apps/finance/services/api/main/models.go

@@ -240,12 +240,12 @@ type Goal struct {
 // GoalPlan is computed at request time — never stored.
 type GoalPlan struct {
 	Goal
-	MonthsLeft          int
-	MonthlyCents        int64   // required monthly contribution
-	ImpactOnDisposable  int64   // how much disposable income this eats
-	MonthsAtCurrentRate int     // months to reach goal at current savings rate
-	Feasible            bool    // can reach it by deadline at required monthly
-	ProgressPct         int
+	MonthsLeft          int64
+	MonthlyCents        int64
+	ImpactOnDisposable  int64
+	MonthsAtCurrentRate int64
+	Feasible            bool
+	ProgressPct         int64
 }
 
 type GoalsData struct {