feat(quotes): lock quotes with posted receipts; per-item target project + title dedup

Quotes that already have warehouse receipts can no longer be edited or rolled back:
- backend: quote_has_receipts() guard — replace_quote_children and every backward status transition now return 409 with «این پیشنهاد به‌دلیل ثبت رسید در انبار، غیرقابل ویرایش یا بازگشت است.»
- reopening to «offered» additionally clears item_decisions.project_id (the purchased-project link belongs to acceptance, not to a reopened offer)
- frontend EditModal: hasReceipts locks the whole form — disabled inputs and date pickers (JalaliDatePicker/NumberInput/MilestoneRow/MultiSelectCombobox gained disabled support), add/remove controls for items, termsheets and milestones hidden, status change blocked, amber warning banner; quote deletion now goes through a confirmation dialog (useDeleteQuote)
- date-only semantics: JalaliDatePicker keeps/emits YYYY-MM-DD when withTime=false (typing, «امروز», day selection) and toDateOnly no longer mangles pure date strings

Per-item target project (candidate projects stay intact):
- expand_service exposes the decision target project (decision.project + line_item.target_project)
- the accept payload derives item_decisions.project_id from that target project and sends item_projects: [] so line_item_projects keeps the original candidates untouched
- AcceptModal/EditModal select the target project per line item

Material titles:
- quoteUtils.formatMaterialTitle() composes one normalized, deduplicated «name + brand + specs» title, replacing materialLabel/materialSpecs/specsLabel usage across dashboard cards, quote detail and the modals

Verified: python compile + api/frontend image builds (tsc + vite) clean.

frontend/src/pages/Dashboard/AcceptModal.tsx

@@ -5,11 +5,9 @@ import { api, nextDashedId } from "../../lib/api";
 import { useMaterials, useProjects, useQuotes, useUpdateQuote, useSuppliers } from "../../hooks";
 import {
   activeItems,
+  formatMaterialTitle,
   itemTermsheetIds,
   materialById,
-  materialLabel,
-  materialSpecs,
-  specsLabel,
   supplierById,
 } from "../../lib/quoteUtils";
 import { faNum, fmtNum } from "../../lib/formatters";
@@ -76,11 +74,13 @@ export function AcceptModal({ quoteId, onClose }: AcceptModalProps) {
     const projSel: Record<string, string> = {};
     q.line_items.forEach((li) => {
       const names = (li.projects || []).map((p) => p.name).filter(Boolean);
-      projSel[li.id] = names.length
-        ? names[0]
-        : q.projects && q.projects.length
-          ? q.projects[0]
-          : q.project || "";
+      projSel[li.id] = li.target_project?.name
+        ? li.target_project.name
+        : names.length
+          ? names[0]
+          : q.projects && q.projects.length
+            ? q.projects[0]
+            : q.project || "";
     });
     setItemProjectsSel(projSel);
     setReady(true);
@@ -219,17 +219,20 @@ export function AcceptModal({ quoteId, onClose }: AcceptModalProps) {
       if (t.status === "accepted" && !usedIds.has(t.id)) t.status = "offered";
     });
 
-    // پروژه‌ی هر قلم (تکی) + همگام‌سازی پروژه‌های سطح پیشنهاد
+    // پروژه‌ی هر قلم (تکی هدف خرید) + همگام‌سازی پروژه‌های سطح پیشنهاد
     const projUnion = new Set<string>();
     next.line_items.forEach((li) => {
       if (li.rejected) return;
       const name = itemProjectsSel[li.id];
       if (name === undefined) return;
-      li.projects = name ? [{ id: "", name }] : [];
+      li.target_project = name ? { id: "", name } : null;
+      // توجه: li.projects دست‌نخورده باقی می‌ماند تا پروژه‌های کاندیدای اولیه حفظ شوند
       if (name) projUnion.add(name);
     });
-    next.projects = [...projUnion];
-    next.project = next.projects[0] || "";
+    if (projUnion.size > 0) {
+      next.projects = [...projUnion];
+      next.project = next.projects[0] || "";
+    }
 
     const now = new Date().toISOString();
     next.accepted_date = acceptDate || now;
@@ -298,7 +301,6 @@ export function AcceptModal({ quoteId, onClose }: AcceptModalProps) {
             {allItems.map((li) => {
               const removed = removedItems.has(li.id);
               const m = materialById(materials, li.material_id);
-              const specText = specsLabel(materialSpecs(m));
               return (
                 <div key={li.id} className={`accept-item-assign-row ${removed ? "rejected" : ""}`}>
                   <input
@@ -314,8 +316,7 @@ export function AcceptModal({ quoteId, onClose }: AcceptModalProps) {
                     }}
                   />
                   <span className="flex-1 text-[13px]">
-                    {materialLabel(m)}
-                    {specText ? ` · ${specText}` : ""}
+                    {formatMaterialTitle(m)}
                   </span>
                   <span className="text-[12px] text-muted">
                     {fmtNum(li.quantity)} {li.unit} × {groupCommas(li.unit_price, true)}
@@ -351,14 +352,12 @@ export function AcceptModal({ quoteId, onClose }: AcceptModalProps) {
               .filter((li) => !removedItems.has(li.id))
               .map((li) => {
                 const m = materialById(materials, li.material_id);
-                const specText = specsLabel(materialSpecs(m));
                 return (
                   <div key={li.id} className="rounded-lg border border-line p-2.5">
                     <div className="mb-1.5 text-[12.5px]">
                       <span className="font-semibold">
-                        {materialLabel(m)}
+                        {formatMaterialTitle(m)}
                       </span>
-                      {specText ? <span className="text-muted"> · {specText}</span> : ""}
                       <span className="ms-2 text-[11px] text-muted">
                         {fmtNum(li.quantity)} {li.unit}
                       </span>