Feature batch: Projects, Recurrence, Group settings, Bug fixes

- Projects CRUD API + invite members
- Task recurrence (daily/weekly/monthly) with auto-creation
- Group time zones + GPS locations settings
- i18n fallback fix (no more undefined labels)
- UX: action buttons in one row
- Chat/Calendar: relative API URLs
- DB: task_assignments, projects tables, recurrence column

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

apps/tasks/lib/api.ts

@@ -204,3 +204,44 @@ export function generateGoalPlan(token: string, id: string) {
 export function getGoalReport(token: string, id: string) {
   return apiFetch<{ data: GoalReport }>(`/api/v1/goals/${id}/report`, { token });
 }
+
+
+// Projects
+export interface Project {
+  id: string;
+  owner_id: string | null;
+  name: string;
+  description: string;
+  color: string;
+  icon: string;
+  members: string[];
+  task_count?: number;
+  done_count?: number;
+  created_at: string;
+  updated_at: string;
+}
+
+export function getProjects(token: string, userId?: string) {
+  const qs = userId ? "?user_id=" + userId : "";
+  return apiFetch<{ data: Project[] }>("/api/v1/projects" + qs, { token });
+}
+
+export function getProject(token: string, id: string) {
+  return apiFetch<{ data: Project }>("/api/v1/projects/" + id, { token });
+}
+
+export function createProject(token: string, data: Partial<Project>) {
+  return apiFetch<{ data: Project }>("/api/v1/projects", { method: "POST", body: data, token });
+}
+
+export function updateProject(token: string, id: string, data: Partial<Project>) {
+  return apiFetch<{ data: Project }>("/api/v1/projects/" + id, { method: "PUT", body: data, token });
+}
+
+export function deleteProject(token: string, id: string) {
+  return apiFetch<void>("/api/v1/projects/" + id, { method: "DELETE", token });
+}
+
+export function inviteToProject(token: string, id: string, userId: string) {
+  return apiFetch<{ data: Project; status: string }>("/api/v1/projects/" + id + "/invite", { method: "POST", body: { user_id: userId }, token });
+}