Introduce initial version of the Lonc app with core features, styling, and configurations.

- Add base app structure, including Bootstrap setup and Alpine.js integration.
- Implement authentication flow with session handling.
- Integrate stock management and label creation functionalities.
- Include responsive styling and theme using CSS variables and custom components.
- Add API clients for Tryton-based backend.
- Set up kitchen and dashboard navigation workflows.
- Configure service worker for PWA support.

src/api/labels.js

@@ -0,0 +1,55 @@
+import { apiRequest, getPath } from './client.js';
+
+export function normalizeLabelImagePayload(payload) {
+  if (!payload) {
+    return null;
+  }
+
+  if (payload instanceof Blob) {
+    return {
+      objectUrl: URL.createObjectURL(payload),
+      contentType: payload.type,
+    };
+  }
+
+  if (payload?.imageUrl) {
+    return {
+      objectUrl: payload.imageUrl,
+      contentType: payload.contentType || 'image/png',
+    };
+  }
+
+  if (payload?.imageSvg) {
+    const blob = new Blob([payload.imageSvg], { type: 'image/svg+xml' });
+    return {
+      objectUrl: URL.createObjectURL(blob),
+      contentType: 'image/svg+xml',
+    };
+  }
+
+  if (payload?.label) {
+    return {
+      objectUrl: `data:image/png;base64,${payload.label}`,
+      contentType: 'image/png',
+    };
+  }
+
+  return null;
+}
+
+export async function previewLabel(store, body) {
+  const payload = await apiRequest(store, getPath('items'), {
+    method: 'POST',
+    body,
+    accept: 'image/svg+xml, image/png, application/json',
+    includeKitchen: false,
+    query: { label: 1, preview: 1 },
+  });
+
+  const image = normalizeLabelImagePayload(payload);
+  if (image) {
+    return image;
+  }
+
+  throw new Error('Label preview response did not include an image.');
+}