Add signature management features for booking contracts

- Implement MySignatureCard component for viewing and updating saved signatures.
- Enhance BookingContractPage to utilize saved signatures for contract signing.
- Introduce hooks for fetching and saving user signatures.
- Update ContractView interface to include saved signature details.
- Create signatures service for API interactions related to user signatures.

apps/edr-freight-web/portal/src/components/profile/MySignatureCard.tsx

@@ -0,0 +1,141 @@
+import { useState } from "react";
+import { FileSignature, Loader2 } from "lucide-react";
+
+import { ContractSignaturePad } from "@/components/bookings/ContractSignaturePad";
+import useAuth from "@/hooks/useAuth";
+import {
+  useMySignature,
+  useSaveSignature,
+} from "@/hooks/useSavedSignature";
+import {
+  Button,
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+  Input,
+  Label,
+} from "@edr/ui-common";
+
+/**
+ * Lets the signed-in customer view and update the reusable signature stored on
+ * their profile. The same signature is offered for approval when signing a
+ * booking contract.
+ */
+export function MySignatureCard() {
+  const { user } = useAuth();
+  const { data: saved, isPending } = useMySignature();
+  const saveMutation = useSaveSignature();
+
+  const [open, setOpen] = useState(false);
+  const [signerName, setSignerName] = useState("");
+  const [signatureData, setSignatureData] = useState<string | null>(null);
+
+  const defaultName = user?.name?.en || user?.username || user?.email || "";
+
+  const openDialog = () => {
+    setSignerName(saved?.signerDisplayName ?? defaultName);
+    setSignatureData(null);
+    setOpen(true);
+  };
+
+  const save = () => {
+    if (!signatureData || !signerName.trim()) return;
+    saveMutation.mutate(
+      {
+        signerDisplayName: signerName.trim(),
+        signatureImageBase64: signatureData,
+      },
+      { onSuccess: () => setOpen(false) },
+    );
+  };
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle className="flex items-center gap-2">
+          <FileSignature className="size-5 text-primary" />
+          My signature
+        </CardTitle>
+        <CardDescription>
+          Reused to approve and sign booking contracts.
+        </CardDescription>
+      </CardHeader>
+      <CardContent className="flex flex-col gap-4">
+        {isPending ? (
+          <div className="flex h-36 items-center justify-center">
+            <Loader2 className="size-6 animate-spin text-primary" />
+          </div>
+        ) : saved?.signatureImageUrl ? (
+          <div className="flex flex-col gap-2">
+            <div className="overflow-hidden rounded-lg border-2 border-dashed border-border bg-white">
+              <img
+                src={saved.signatureImageUrl}
+                alt="My saved signature"
+                className="mx-auto h-36 w-full object-contain"
+              />
+            </div>
+            <p className="text-xs text-muted-foreground">
+              Saved as {saved.signerDisplayName}
+            </p>
+          </div>
+        ) : (
+          <p className="text-sm text-muted-foreground">
+            You have not saved a signature yet.
+          </p>
+        )}
+        <Button variant="outline" size="sm" onClick={openDialog}>
+          {saved?.signatureImageUrl ? "Update signature" : "Add signature"}
+        </Button>
+      </CardContent>
+
+      <Dialog open={open} onOpenChange={setOpen}>
+        <DialogContent className="sm:max-w-md">
+          <DialogHeader>
+            <DialogTitle>Save your signature</DialogTitle>
+            <DialogDescription>
+              Draw your signature below. It will be stored on your profile for
+              future contracts.
+            </DialogDescription>
+          </DialogHeader>
+          <div className="space-y-4">
+            <div className="space-y-2">
+              <Label htmlFor="profileSignerName">Full name</Label>
+              <Input
+                id="profileSignerName"
+                value={signerName}
+                onChange={(e) => setSignerName(e.target.value)}
+                placeholder="As shown on contracts"
+              />
+            </div>
+            <ContractSignaturePad onChange={setSignatureData} />
+          </div>
+          <DialogFooter>
+            <Button variant="outline" onClick={() => setOpen(false)}>
+              Cancel
+            </Button>
+            <Button
+              disabled={
+                saveMutation.isPending || !signatureData || !signerName.trim()
+              }
+              onClick={save}
+            >
+              {saveMutation.isPending ? (
+                <Loader2 className="size-4 animate-spin" />
+              ) : (
+                "Save signature"
+              )}
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+    </Card>
+  );
+}