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/auth.js

@@ -0,0 +1,111 @@
+import { CONNECTION_STATES, TRYTON_APPLICATION } from '../app/config.js';
+import { apiRequest, getPath } from './client.js';
+import { listKitchens } from './kitchens.js';
+
+function extractKey(payload) {
+  if (typeof payload === 'string') {
+    return payload;
+  }
+
+  return payload?.key || payload?.application_key || payload?.data?.key || null;
+}
+
+function isAuthFailure(error) {
+  const status = error?.cause?.status || error?.status;
+  return status === 401 || status === 403;
+}
+
+export async function login(store, credentials) {
+  const payload = await apiRequest(store, getPath('userApplication'), {
+    method: 'POST',
+    body: {
+      user: credentials.userLogin,
+      application: TRYTON_APPLICATION,
+    },
+    includeKitchen: false,
+  });
+
+  const applicationKey = extractKey(payload);
+  if (!applicationKey) {
+    throw new Error('User application creation did not return a key.');
+  }
+
+  const session = {
+    userLogin: credentials.userLogin,
+    applicationKey,
+    state: CONNECTION_STATES.pendingValidation,
+    hasValidated: false,
+  };
+  store.setSession(session);
+  return session;
+}
+
+export async function restoreSession(store) {
+  if (!store.session) {
+    return null;
+  }
+
+  try {
+    await verifyConnection(store);
+  } catch (error) {
+    if (!isAuthFailure(error)) {
+      throw error;
+    }
+  }
+
+  return store.session;
+}
+
+export async function logout(store) {
+  try {
+    if (store.session?.applicationKey && store.session?.userLogin) {
+      await apiRequest(store, getPath('userApplication'), {
+        method: 'DELETE',
+        body: {
+          user: store.session.userLogin,
+          key: store.session.applicationKey,
+          application: TRYTON_APPLICATION,
+        },
+        includeKitchen: false,
+      });
+    }
+  } finally {
+    store.clearSessionState();
+  }
+}
+
+export async function verifyConnection(store) {
+  if (!store.session?.applicationKey) {
+    return null;
+  }
+
+  try {
+    await listKitchens(store);
+    store.setSession({
+      ...store.session,
+      state: CONNECTION_STATES.connected,
+      hasValidated: true,
+    });
+    return store.session;
+  } catch (error) {
+    if (!isAuthFailure(error)) {
+      throw error;
+    }
+
+    store.setSession({
+      ...store.session,
+      state: store.session.hasValidated
+        ? CONNECTION_STATES.invalidKey
+        : CONNECTION_STATES.pendingValidation,
+    });
+
+    throw new Error(
+      store.session.hasValidated
+        ? 'The stored application key is no longer valid.'
+        : 'The application key is still waiting for validation in Tryton preferences.',
+      {
+        cause: error.cause || error,
+      },
+    );
+  }
+}