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.

backend/app/services/quote_service.py

@@ -279,13 +279,23 @@ async def update_quote(db: AsyncSession, quote_id: UUID, payload: QuoteUpdate, a
     return quote
 
 
+async def quote_has_receipts(db: AsyncSession, quote_id: UUID) -> bool:
+    """Returns True if any warehouse receipt has been posted for the quote's items."""
+    count = await db.scalar(
+        select(func.count(ItemReceipt.id))
+        .join(ItemDecision, ItemReceipt.item_decision_id == ItemDecision.id)
+        .join(LineItem, ItemDecision.line_item_id == LineItem.id)
+        .where(LineItem.quote_id == quote_id, ItemReceipt.received_qty > 0)
+    )
+    return (count or 0) > 0
+
+
 async def replace_quote_children(
     db: AsyncSession, quote_id: UUID, payload: QuoteChildrenReplaceIn, actor: str | None = None
 ) -> Quote:
     """Full replacement of a quote's line items + termsheets (edit modal).
 
-    Only allowed while the quote is still offered — acceptance data
-    (decisions/receipts) would otherwise be destroyed.
+    Only allowed while the quote is still offered and has no warehouse receipts.
     """
     async with db.begin():
         quote = await get_quote_or_404(db, quote_id)
@@ -294,6 +304,11 @@ async def replace_quote_children(
                 "برای تغییر اقلام یا شرایط پرداخت، ابتدا وضعیت را به «پیشنهاد شده» برگردانید",
                 field="status",
             )
+        if await quote_has_receipts(db, quote.id):
+            raise ConflictError(
+                "این پیشنهاد به‌دلیل ثبت رسید در انبار، غیرقابل ویرایش یا بازگشت است.",
+                field="status",
+            )
         # children cascade via DDL: item_termsheets, item_decisions, item_receipts, schedule_steps
         await db.execute(
             delete(LineItem).where(LineItem.quote_id == quote.id).execution_options(synchronize_session=False)
@@ -312,6 +327,12 @@ async def _apply_status_transition(db: AsyncSession, quote: Quote, new_status: s
     if new_status not in BACKWARD_TRANSITIONS.get(current, set()):
         raise ConflictError("انتقال وضعیت مجاز نیست — فقط انتقال‌های عقب‌گرد پذیرفته می‌شود", field="status")
 
+    if await quote_has_receipts(db, quote.id):
+        raise ConflictError(
+            "این پیشنهاد به‌دلیل ثبت رسید در انبار، غیرقابل ویرایش یا بازگشت است.",
+            field="status",
+        )
+
     if new_status == "offered":
         # Reopen: clear lifecycle dates, demote accepted termsheets, reset decisions.
         quote.accepted_date = None
@@ -332,10 +353,11 @@ async def _apply_status_transition(db: AsyncSession, quote: Quote, new_status: s
                 chosen_item_termsheet_id=None,
                 adjusted_unit_price=None,
                 adjusted_notes=None,
+                project_id=None,
             )
             .execution_options(synchronize_session=False)
         )
-        # item_receipts are deliberately NOT deleted (contract P0-17).
+        # LineItemProjects (candidate projects) are preserved untouched!
     elif new_status == "accepted":  # arrived -> accepted
         quote.arrived_date = None
 
@@ -692,7 +714,8 @@ async def expire_quote(db: AsyncSession, quote_id: UUID, actor: str | None = Non
 
 
 async def delete_quote(db: AsyncSession, quote_id: UUID) -> dict:
-    async with db.begin():
+    tx = db.begin_nested() if db.in_transaction() else db.begin()
+    async with tx:
         quote = await get_quote_or_404(db, quote_id)
         if quote.status in ("accepted", "arrived"):
             raise ConflictError("پیشنهادهای پذیرفته‌شده یا رسیده قابل حذف نیستند")
@@ -712,6 +735,17 @@ async def delete_quote(db: AsyncSession, quote_id: UUID) -> dict:
         termsheets = (await db.execute(select(Termsheet).where(Termsheet.quote_id == quote.id))).scalars().all()
         events = (await db.execute(select(QuoteEvent).where(QuoteEvent.quote_id == quote.id))).scalars().all()
 
+        # clean up attachments in MinIO before cascade
+        from app.models.files import QuoteAttachment
+        from app.services import storage
+
+        attachments = (await db.execute(select(QuoteAttachment).where(QuoteAttachment.quote_id == quote.id))).scalars().all()
+        for att in attachments:
+            try:
+                await storage.remove_object(att.object_key)
+            except Exception:
+                logger.warning("Failed to remove MinIO object %s for attachment %s", att.object_key, att.id)
+
         await db.delete(quote)
         return {
             "id": str(quote.id),
@@ -722,6 +756,7 @@ async def delete_quote(db: AsyncSession, quote_id: UUID) -> dict:
                 "events": len(events),
                 "decisions": len(decisions),
                 "receipts": len(receipts),
+                "attachments": len(attachments),
             },
         }