feat(quotes): add no-quote toggle to Quote Details card

Switch + Label inside the Quote Details card on the process page.
Optimistic update with rollback on error. When flipped on, scrolls
the quote_notes editor into view so the operator can type the
reason in the same flow.

src/app/(app)/quotes/[id]/process/page.tsx

@@ -9,6 +9,7 @@ import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Textarea } from "@/components/ui/textarea";
 import { Label } from "@/components/ui/label";
+import { Switch } from "@/components/ui/switch";
 import {
   Table,
   TableBody,
@@ -136,6 +137,18 @@ export default function QuoteProcessPage({ params }: { params: Promise<{ id: str
   const [inboundAttachments, setInboundAttachments] = useState<QuoteAttachment[]>([]);
   const [addItemOpen, setAddItemOpen] = useState(false);
 
+  /**
+   * No-quote toggle — operator flips this when the customer declines or
+   * the RFQ is out-of-scope, and we want to send an official decline
+   * letter instead of a priced quote. PATCHes `quotes.is_no_quote` via
+   * `/api/v1/quotes/${quote.id}`. When flipped on, scrolls the
+   * `quote_notes` editor into view so the operator can type the reason
+   * in the same flow (the PDF route bypasses pricing gates when this
+   * flag is set — see Task 7).
+   */
+  const [isNoQuote, setIsNoQuote] = useState(!!quote?.is_no_quote);
+  const [noQuoteSaving, setNoQuoteSaving] = useState(false);
+
   /**
    * Per-row "🔍 Lookup" — the inline catalogue matcher. The
    * operator types a SKU into the row's SKU input, hits the small
@@ -743,6 +756,40 @@ export default function QuoteProcessPage({ params }: { params: Promise<{ id: str
     }
   };
 
+  /**
+   * No-quote toggle handler. Optimistic update with rollback on error.
+   * When flipped on (true), scrolls the `quote_notes` editor into view
+   * so the operator can type the reason in the same flow.
+   */
+  const onToggleNoQuote = useCallback(async (next: boolean) => {
+    if (!quote) return;
+    const previous = isNoQuote;
+    setIsNoQuote(next); // optimistic
+    setNoQuoteSaving(true);
+    try {
+      const res = await fetch(`/api/v1/quotes/${quote.id}`, {
+        method: "PATCH",
+        headers: { "content-type": "application/json" },
+        body: JSON.stringify({ is_no_quote: next }),
+      });
+      if (!res.ok) {
+        setIsNoQuote(previous); // rollback
+        toast.error("Couldn't update — try again.");
+      } else if (next) {
+        // Scroll the quote_notes editor into view so the operator can
+        // type the reason immediately.
+        document
+          .getElementById("quote-notes-card")
+          ?.scrollIntoView({ behavior: "smooth", block: "center" });
+      }
+    } catch {
+      setIsNoQuote(previous);
+      toast.error("Couldn't update — try again.");
+    } finally {
+      setNoQuoteSaving(false);
+    }
+  }, [isNoQuote, quote]);
+
   /**
    * Swap the customer on this quote. Called by the `<CustomerSearch>`
    * dropdown in the header. PATCHes the quote on the server, refreshes
@@ -886,6 +933,30 @@ export default function QuoteProcessPage({ params }: { params: Promise<{ id: str
             </div>
             <p className="text-sm"><span className="text-muted-foreground">Created:</span> {formatDate(quote.created)}</p>
             <p className="text-sm"><span className="text-muted-foreground">Description:</span> {(quote.description || "—").slice(0, 60)}</p>
+            <div
+              className={cn(
+                "mt-3 flex items-center justify-between rounded-md border p-3",
+                isNoQuote
+                  ? "border-amber-200 bg-amber-50"
+                  : "border-transparent bg-transparent",
+              )}
+            >
+              <div className="space-y-0.5">
+                <Label htmlFor="is_no_quote" className="text-sm font-medium">
+                  No-quote letter
+                </Label>
+                <p className="text-xs text-muted-foreground">
+                  Send this as an official decline. Prices will be ignored.
+                </p>
+              </div>
+              <Switch
+                id="is_no_quote"
+                checked={isNoQuote}
+                onCheckedChange={onToggleNoQuote}
+                disabled={noQuoteSaving}
+                size="sm"
+              />
+            </div>
           </CardContent>
         </Card>
         <Card>
@@ -1526,11 +1597,15 @@ export default function QuoteProcessPage({ params }: { params: Promise<{ id: str
       {/* Operator note — saved to `quote.quote_notes` and rendered on
           the customer PDF (blue callout below the totals). Sits above
           the Generate PDF card so the operator can edit and then
-          generate in one continuous flow. */}
-      <QuoteNoteCard
-        quoteId={quote.id}
-        initialNotes={quote.quote_notes ?? ""}
-      />
+          generate in one continuous flow. The wrapping div carries the
+          `quote-notes-card` id so the no-quote toggle can scrollIntoView
+          here when the operator flips the toggle on. */}
+      <div id="quote-notes-card">
+        <QuoteNoteCard
+          quoteId={quote.id}
+          initialNotes={quote.quote_notes ?? ""}
+        />
+      </div>
 
       {/* Generate PDFs */}
       <Card>