diff --git a/src/components/ui/mark-ready-dialog.tsx b/src/components/ui/mark-ready-dialog.tsx
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+++ b/src/components/ui/mark-ready-dialog.tsx
@@ -0,0 +1,128 @@
+"use client";
+
+import { useState } from "react";
+import { Loader2 } from "lucide-react";
+
+import { Button } from "@/components/ui/button";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Textarea } from "@/components/ui/textarea";
+
+/**
+ * Modal that asks the operator for a free-text note before marking a
+ * collection-pool row ready. The note is required (non-empty after
+ * trim) and is saved into `OrderItem.notes` by the server route. We
+ * also surface a small "Notes" chip on the row whenever the row has
+ * any notes, so the operator can see at a glance whether they've
+ * already written something.
+ *
+ * The submit button is disabled until the textarea is non-empty.
+ * Whitespace-only content is treated as empty for the disabled
+ * state and the server validation.
+ */
+export interface MarkReadyDialogProps {
+  open: boolean;
+  /** PO number + item description, formatted for the title. */
+  poLabel: string;
+  /** Item description, formatted for the title. */
+  itemLabel: string;
+  /** Any pre-existing note (not currently used; reserved for edit flows). */
+  initialNote?: string;
+  busy?: boolean;
+  serverError?: string | null;
+  onOpenChange: (open: boolean) => void;
+  onSubmit: (note: string) => void;
+}
+
+export function MarkReadyDialog({
+  open,
+  poLabel,
+  itemLabel,
+  initialNote = "",
+  busy = false,
+  serverError = null,
+  onOpenChange,
+  onSubmit,
+}: MarkReadyDialogProps) {
+  const [note, setNote] = useState(initialNote);
+  const trimmed = note.trim();
+  const canSubmit = trimmed.length > 0 && !busy;
+
+  return (
+    <Dialog
+      open={open}
+      onOpenChange={(o) => {
+        if (!busy) {
+          if (!o) setNote("");
+          onOpenChange(o);
+        }
+      }}
+    >
+      <DialogContent className="sm:max-w-md max-h-[90vh] grid-rows-[auto_1fr_auto] gap-0 p-0 overflow-hidden">
+        <DialogHeader className="px-6 pt-6 pb-4 border-b">
+          <DialogTitle>
+            Mark ready: {poLabel} · {itemLabel}
+          </DialogTitle>
+          <DialogDescription>
+            Add a note for the audit log. Required.
+          </DialogDescription>
+        </DialogHeader>
+        <div className="px-6 py-4 space-y-2 overflow-y-auto">
+          <Textarea
+            value={note}
+            onChange={(e) => setNote(e.target.value)}
+            placeholder="e.g. Spoke to David — confirmed pickup tomorrow 09:00"
+            rows={4}
+            maxLength={500}
+            autoFocus
+            disabled={busy}
+            className="min-h-24"
+            onKeyDown={(e) => {
+              // Cmd/Ctrl+Enter submits, like a comment box.
+              if ((e.metaKey || e.ctrlKey) && e.key === "Enter" && canSubmit) {
+                e.preventDefault();
+                onSubmit(trimmed);
+              }
+            }}
+          />
+          <div className="flex items-center justify-between text-xs text-muted-foreground">
+            <span>{note.length}/500</span>
+            <span className="hidden sm:inline">⌘/Ctrl + Enter to save</span>
+          </div>
+          {serverError && (
+            <p
+              role="alert"
+              className="rounded-md border border-destructive/30 bg-destructive/5 px-3 py-2 text-xs text-destructive"
+            >
+              {serverError}
+            </p>
+          )}
+        </div>
+        <DialogFooter className="px-6 py-4 border-t">
+          <Button
+            type="button"
+            variant="outline"
+            onClick={() => onOpenChange(false)}
+            disabled={busy}
+          >
+            Cancel
+          </Button>
+          <Button
+            type="button"
+            onClick={() => onSubmit(trimmed)}
+            disabled={!canSubmit}
+          >
+            {busy && <Loader2 className="mr-1.5 h-4 w-4 animate-spin" />}
+            Save &amp; Mark Ready
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
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