Phase 2: AI Chat, Calendar, Odoo connector, PWA

- AI Chat endpoint (/api/v1/chat) with Claude API context
- Calendar page with FullCalendar.js (day/week/month)
- Odoo API connector (import/export/webhook)
- PWA manifest + service worker for offline
- SW register component

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/lib/api.ts

@@ -1,4 +1,4 @@
-const API_BASE = process.env.NEXT_PUBLIC_API_URL || "http://localhost:3000";
+const API_BASE = typeof window !== "undefined" ? "" : (process.env.NEXT_PUBLIC_API_URL || "http://localhost:3000");
 
 interface ApiOptions {
   method?: string;
@@ -14,15 +14,21 @@ async function apiFetch<T>(path: string, opts: ApiOptions = {}): Promise<T> {
     headers["Authorization"] = `Bearer ${opts.token}`;
   }
 
-  const res = await fetch(`${API_BASE}${path}`, {
+  const url = `${API_BASE}${path}`;
+  const res = await fetch(url, {
     method: opts.method || "GET",
     headers,
     body: opts.body ? JSON.stringify(opts.body) : undefined,
+    cache: "no-store",
   });
 
   if (!res.ok) {
     const err = await res.json().catch(() => ({ message: res.statusText }));
-    throw new Error(err.message || `HTTP ${res.status}`);
+    throw new Error(err.message || err.error || `HTTP ${res.status}`);
+  }
+
+  if (res.status === 204 || res.headers.get("content-length") === "0") {
+    return {} as T;
   }
 
   return res.json();