feat: NAS storage for invoices/offers, code cleanup, date/time fixes

- NAS storage for created invoices (PDF via puppeteer), received invoices,
  and offers with auto-save on create/edit
- Deterministic file paths derived from DB fields (no file_path column needed)
- Separate NAS mount points: NAS_FINANCIALS_PATH, NAS_OFFERS_PATH
- Invoice language field (cs/en) stored per invoice, replaces lang modal
- Invoices list filtered by month/year matching KPI card selection
- Centralized date helpers (src/utils/date.ts) replacing all .toISOString()
  calls that returned UTC instead of local time
- Attendance project switching uses exact time (not rounded)
- Comment cleanup: removed ~100 unnecessary/Czech comments
- Removed as-any casts in orders and attendance
- Prisma migrations: add invoice language, drop received_invoices BLOB columns

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/routes/admin/invoices-pdf.ts

@@ -2,6 +2,9 @@ import { FastifyInstance } from "fastify";
 import QRCode from "qrcode";
 import prisma from "../../config/database";
 import { requirePermission } from "../../middleware/auth";
+import { localDateCzStr } from "../../utils/date";
+import { nasFinancialsManager } from "../../services/nas-financials-manager";
+import { htmlToPdf } from "../../utils/html-to-pdf";
 
 /* ── Helpers ─────────────────────────────────────────────────────── */
 
@@ -9,7 +12,7 @@ function formatDate(date: Date | string | null | undefined): string {
   if (!date) return "";
   const d = new Date(date);
   if (isNaN(d.getTime())) return String(date);
-  return `${String(d.getDate()).padStart(2, "0")}.${String(d.getMonth() + 1).padStart(2, "0")}.${d.getFullYear()}`;
+  return localDateCzStr(d);
 }
 
 function formatNum(n: number, decimals = 2): string {
@@ -278,7 +281,6 @@ export default async function invoicesPdfRoutes(
         unknown
       > | null;
 
-      // Order number lookup
       let orderNumber = "";
       if (invoice.order_id) {
         const orderRow = await prisma.orders.findUnique({
@@ -298,7 +300,6 @@ export default async function invoicesPdfRoutes(
         }
       }
 
-      // Logo
       let logoImg = "";
       if (settings?.logo_data) {
         const buf = Buffer.from(settings.logo_data as Buffer);
@@ -313,7 +314,6 @@ export default async function invoicesPdfRoutes(
       const currency = invoice.currency || "CZK";
       const applyVat = !!invoice.apply_vat;
 
-      // Calculations
       const vatSummary: Record<string, { base: number; vat: number }> = {};
       let subtotal = 0;
 
@@ -380,7 +380,6 @@ export default async function invoicesPdfRoutes(
         });
       }
 
-      // Address lines
       const supp = buildAddressLines(settings, true, t);
       const cust = buildAddressLines(customer, false, t);
 
@@ -410,7 +409,6 @@ export default async function invoicesPdfRoutes(
 
       const invoiceNumber = escapeHtml(invoice.invoice_number);
 
-      // Items HTML
       const itemsHtml = items
         .map((item, i) => {
           const qty = Number(item.quantity);
@@ -434,7 +432,6 @@ export default async function invoicesPdfRoutes(
         })
         .join("");
 
-      // VAT recap rows
       const vatRecapHtml = vatRecap
         .map(
           (vr) => `<tr>
@@ -446,7 +443,6 @@ export default async function invoicesPdfRoutes(
         )
         .join("");
 
-      // VAT detail rows for totals section
       let vatDetailHtml = "";
       if (applyVat) {
         for (const [rate, data] of Object.entries(vatSummary)) {
@@ -460,7 +456,6 @@ export default async function invoicesPdfRoutes(
         }
       }
 
-      // Notes section
       const notesRaw = invoice.notes ?? "";
       const notesStripped = notesRaw.replace(/<[^>]*>/g, "").trim();
       const notesHtml = notesStripped
@@ -1027,6 +1022,31 @@ ${indentCSS}
 </body>
 </html>`;
 
+      // Save PDF to NAS
+      if (nasFinancialsManager.isConfigured() && invoice.invoice_number) {
+        const issueDate = invoice.issue_date
+          ? new Date(invoice.issue_date)
+          : new Date();
+        const saveMode = query.save === "1";
+        const pdfPromise = htmlToPdf(html)
+          .then((pdfBuffer) => {
+            nasFinancialsManager.saveIssuedInvoicePdf(
+              invoice.invoice_number!,
+              issueDate.getFullYear(),
+              issueDate.getMonth() + 1,
+              pdfBuffer,
+            );
+          })
+          .catch((err) => {
+            request.log.error(err, "Failed to save invoice PDF to NAS");
+          });
+
+        if (saveMode) {
+          await pdfPromise;
+          return reply.send({ success: true, message: "PDF uloženo" });
+        }
+      }
+
       return reply.type("text/html").send(html);
     },
   );