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/offers-pdf.ts

@@ -1,12 +1,15 @@
 import { FastifyInstance } from "fastify";
 import prisma from "../../config/database";
 import { requirePermission } from "../../middleware/auth";
+import { localDateCzStr } from "../../utils/date";
+import { nasOffersManager } from "../../services/nas-offers-manager";
+import { htmlToPdf } from "../../utils/html-to-pdf";
 
 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);
 }
 
 /** Format number with comma decimal separator and non-breaking space thousands separator */
@@ -53,7 +56,6 @@ function cleanQuillHtml(html: string | null | undefined): string {
   if (!html) return "";
   const allowedTags =
     "<p><br><strong><em><u><s><ul><ol><li><span><sub><sup><a><h1><h2><h3><h4><blockquote><pre>";
-  // Simple strip_tags equivalent: remove tags not in allowed list
   let s = html;
   // Remove dangerous tags with content
   s = s.replace(
@@ -95,7 +97,6 @@ function buildAddressLines(
   const nameKey = isSupplier ? "company_name" : "name";
   const name = String(entity[nameKey] || "");
 
-  // Parse custom_fields
   let cfData: Array<{ name?: string; value?: string; showLabel?: boolean }> =
     [];
   let fieldOrder: string[] | null = null;
@@ -201,6 +202,7 @@ export default async function offersPdfRoutes(
     { preHandler: requirePermission("offers.view") },
     async (request, reply) => {
       const id = parseInt(request.params.id, 10);
+      const query = request.query as Record<string, string>;
 
       try {
         const quotation = await prisma.quotations.findUnique({
@@ -225,7 +227,6 @@ export default async function offersPdfRoutes(
         const currency = quotation.currency || "EUR";
         const t = (key: string): string => TRANSLATIONS[key]?.[langKey] || key;
 
-        // Logo
         let logoImg = "";
         if (settings?.logo_data) {
           const buf = Buffer.from(settings.logo_data);
@@ -236,7 +237,6 @@ export default async function offersPdfRoutes(
           logoImg = `<img src="data:${escapeHtml(mime)};base64,${buf.toString("base64")}" class="logo" />`;
         }
 
-        // Calculations
         const items = quotation.quotation_items;
         let subtotal = 0;
         for (const item of items) {
@@ -251,7 +251,6 @@ export default async function offersPdfRoutes(
         const totalToPay = subtotal + vatAmount;
         const exchangeRate = Number(quotation.exchange_rate) || 0;
 
-        // Scope content check
         let hasScopeContent = false;
         for (const s of quotation.scope_sections) {
           if ((s.content || "").trim() || (s.title || "").trim()) {
@@ -260,7 +259,6 @@ export default async function offersPdfRoutes(
           }
         }
 
-        // Addresses
         const cust = buildAddressLines(
           quotation.customers as unknown as Record<string, unknown>,
           false,
@@ -288,7 +286,6 @@ export default async function offersPdfRoutes(
           indentCSS += `  li.ql-indent-${n} { padding-left: ${liPad}em; }\n`;
         }
 
-        // Items HTML
         let itemsHtml = "";
         items.forEach((item, i) => {
           const lineTotal =
@@ -304,7 +301,6 @@ export default async function offersPdfRoutes(
           </tr>`;
         });
 
-        // Totals HTML
         let totalsHtml = "";
         if (applyVat) {
           totalsHtml += `<div class="detail-rows">
@@ -328,7 +324,6 @@ export default async function offersPdfRoutes(
 
         const quotationNumber = escapeHtml(quotation.quotation_number);
 
-        // Scope HTML
         let scopeHtml = "";
         if (hasScopeContent) {
           scopeHtml += '<div class="scope-page">';
@@ -768,6 +763,30 @@ ${indentCSS}
 </body>
 </html>`;
 
+        // Save PDF to NAS
+        if (nasOffersManager.isConfigured() && quotation.quotation_number) {
+          const created = quotation.created_at
+            ? new Date(quotation.created_at)
+            : new Date();
+          const saveMode = query.save === "1";
+          const pdfPromise = htmlToPdf(html)
+            .then((pdfBuffer) => {
+              nasOffersManager.saveOfferPdf(
+                quotation.quotation_number!,
+                created.getFullYear(),
+                pdfBuffer,
+              );
+            })
+            .catch((err) => {
+              request.log.error(err, "Failed to save offer PDF to NAS");
+            });
+
+          if (saveMode) {
+            await pdfPromise;
+            return reply.send({ success: true, message: "PDF uloženo" });
+          }
+        }
+
         return reply.type("text/html").send(html);
       } catch (err) {
         request.log.error(err, "PDF generation failed");