feat(05-04): extend client-view with activeOffers + create forecast-queries.ts

- Add activeOffers field to ProjectView and ClientView interfaces (public_name only — never internal_name)
- Add offer queries to getProjectView(): project_offers JOIN offer_micros (explicit public_name selection), cumulative price via offer_micro_services JOIN offer_services
- Create src/lib/forecast-queries.ts with ForecastMonth type and getRevenueForecast12Months() 12-bucket JS algorithm
- Forecast spreads accepted_total evenly across duration_months from start_date

src/lib/forecast-queries.ts

@@ -0,0 +1,57 @@
+import { db } from "@/db";
+import { project_offers, offer_micros } from "@/db/schema";
+import { eq } from "drizzle-orm";
+
+export type ForecastMonth = {
+  year: number;
+  month: number;    // 1-12
+  label: string;   // "giu 2026"
+  total: number;
+};
+
+export async function getRevenueForecast12Months(): Promise<ForecastMonth[]> {
+  // Load all project offers with micro duration info
+  const offers = await db
+    .select({
+      start_date: project_offers.start_date,
+      duration_months: offer_micros.duration_months,
+      accepted_total: project_offers.accepted_total,
+    })
+    .from(project_offers)
+    .innerJoin(offer_micros, eq(project_offers.micro_id, offer_micros.id));
+
+  // Build 12-month bucket array starting from current month
+  const now = new Date();
+  const buckets: ForecastMonth[] = Array.from({ length: 12 }, (_, i) => {
+    const d = new Date(now.getFullYear(), now.getMonth() + i, 1);
+    return {
+      year: d.getFullYear(),
+      month: d.getMonth() + 1,
+      label: d.toLocaleDateString("it-IT", { month: "short", year: "numeric" }),
+      total: 0,
+    };
+  });
+
+  for (const offer of offers) {
+    // Skip offers with no accepted_total — they contribute 0 to forecast
+    if (!offer.accepted_total) continue;
+    const total = parseFloat(String(offer.accepted_total));
+    if (isNaN(total) || total <= 0) continue;
+
+    const perMonth = total / offer.duration_months;
+    const start = new Date(offer.start_date);
+
+    for (let m = 0; m < offer.duration_months; m++) {
+      const offerMonth = new Date(start.getFullYear(), start.getMonth() + m, 1);
+      const bucket = buckets.find(
+        (b) => b.year === offerMonth.getFullYear() && b.month === offerMonth.getMonth() + 1
+      );
+      if (bucket) bucket.total += perMonth;
+    }
+  }
+
+  // Round totals to 2 decimal places
+  buckets.forEach((b) => { b.total = Math.round(b.total * 100) / 100; });
+
+  return buckets;
+}