feat(dashboard): add multi-project allocation UI in AcceptModal and merge on reopen in EditModal

- Add allocations field to LineItem and propagate in api.quotes.update
- Implement allocation cards in AcceptModal Section 3 with per-row project select and sum validation
- Disable previously selected projects within the same item to prevent duplicates
- Merge split items client-side in EditModal when transitioning status to offered

frontend/src/lib/api.ts

@@ -927,13 +927,28 @@ export const api = {
 
       if (becomingAccepted) {
         const acceptedTs = (patch.termsheets || []).filter((t) => t.status === "accepted");
-        // پروژه‌ی واحدِ انتخاب‌شده برای هر قلم (item_decisions.project_id)
+        // پروژه‌ی واحدِ انتخاب‌شده یا تخصیص‌های چندپروژه‌ای برای هر قلم
         const targetProjByLine = new Map<string, string>();
+        const allocationsByLine = new Map<string, { project_id: string; quantity: number }[]>();
         for (const li of patch.line_items || []) {
-          const tp = li.target_project;
-          if (tp && tp.name) {
-            const pid = looksLikeUuid(tp.id) ? tp.id : await projectIdByNameOrCreate(tp.name);
-            if (pid) targetProjByLine.set(li.id, pid);
+          if (li.allocations && li.allocations.length > 0) {
+            const resolvedAllocs: { project_id: string; quantity: number }[] = [];
+            for (const a of li.allocations) {
+              const pid = looksLikeUuid(a.project_id) ? a.project_id! : await projectIdByNameOrCreate(a.project_name);
+              if (pid && a.quantity > 0) {
+                resolvedAllocs.push({ project_id: pid, quantity: Number(a.quantity) });
+              }
+            }
+            if (resolvedAllocs.length) {
+              allocationsByLine.set(li.id, resolvedAllocs);
+              targetProjByLine.set(li.id, resolvedAllocs[0].project_id);
+            }
+          } else {
+            const tp = li.target_project;
+            if (tp && tp.name) {
+              const pid = looksLikeUuid(tp.id) ? tp.id : await projectIdByNameOrCreate(tp.name);
+              if (pid) targetProjByLine.set(li.id, pid);
+            }
           }
         }
 
@@ -953,11 +968,13 @@ export const api = {
             const idx = li.accepted_ts_id ? acceptedTs.findIndex((t) => t.id === li.accepted_ts_id) : -1;
             const chosen = !li.rejected && idx >= 0;
             const chosenProjId = targetProjByLine.get(li.id);
+            const lineAllocs = allocationsByLine.get(li.id);
             return {
               line_item_id: li.id,
               status: chosen ? "chosen" : "rejected",
               ...(chosen ? { accepted_termsheet_index: idx } : {}),
               ...(chosen && chosenProjId ? { project_id: chosenProjId } : {}),
+              ...(chosen && lineAllocs && lineAllocs.length ? { allocations: lineAllocs } : {}),
               ...(li.unit_price != null ? { adjusted_unit_price: li.unit_price } : {}),
             };
           }),

frontend/src/lib/types.ts

@@ -73,6 +73,7 @@ export interface LineItem {
   projects?: { id: string; name: string }[]; // پروژه‌های کاندیدای تخصیص‌یافته به این قلم (line_item_projects)
   target_project?: { id: string; name: string } | null; // پروژه‌ی نهایی انتخاب‌شده در هنگام خرید (item_decisions.project_id)
   target_project_id?: string | null;
+  allocations?: { project_id?: string; project_name: string; quantity: number }[]; // تخصیص چندپروژه‌ای در پذیرش
 }
 
 // پیشنهاد خرید (اصلی‌ترین entity)