feat(tasks): implement task management actions and UI components

- Added actions for creating, updating, completing, and deleting tasks in `actions.ts`.
- Refactored `TasksPage` to fetch tasks from Supabase and display them using the new `TasksClient` component.
- Created `tasks-client.tsx` to handle task listing and Kanban view with filtering capabilities.
- Introduced a dialog for task creation and editing with form validation.
- Enhanced task display with status and priority badges, and added overdue checks.

app/(dashboard)/tasks/actions.ts

@@ -0,0 +1,144 @@
+"use server";
+
+import { createClient } from "@/lib/supabase/server";
+import { revalidatePath } from "next/cache";
+
+const TASK_STATUSES = ["todo", "in_progress", "done"] as const;
+const TASK_PRIORITIES = ["low", "medium", "high", "urgent"] as const;
+
+function cleanText(value: FormDataEntryValue | null) {
+  const text = typeof value === "string" ? value.trim() : "";
+  return text.length > 0 ? text : null;
+}
+
+function readStatus(value: FormDataEntryValue | null) {
+  const status = typeof value === "string" ? value : "todo";
+  return TASK_STATUSES.includes(status as (typeof TASK_STATUSES)[number])
+    ? status
+    : "todo";
+}
+
+function readPriority(value: FormDataEntryValue | null) {
+  const priority = typeof value === "string" ? value : "medium";
+  return TASK_PRIORITIES.includes(priority as (typeof TASK_PRIORITIES)[number])
+    ? priority
+    : "medium";
+}
+
+function readMinutes(value: FormDataEntryValue | null) {
+  const number = Number(value);
+  return Number.isFinite(number) && number >= 0 ? Math.round(number) : null;
+}
+
+async function getCurrentUserId() {
+  const supabase = await createClient();
+  const {
+    data: { user },
+    error,
+  } = await supabase.auth.getUser();
+
+  if (error || !user) {
+    throw new Error("Görev işlemi için giriş yapmış kullanıcı bulunamadı.");
+  }
+
+  return { supabase, userId: user.id };
+}
+
+function readPayload(formData: FormData) {
+  return {
+    title: cleanText(formData.get("title")),
+    description: cleanText(formData.get("description")),
+    status: readStatus(formData.get("status")),
+    priority: readPriority(formData.get("priority")),
+    client_id: cleanText(formData.get("client_id")),
+    project_id: cleanText(formData.get("project_id")),
+    due_at: cleanText(formData.get("due_at")),
+    estimated_minutes: readMinutes(formData.get("estimated_minutes")),
+    actual_minutes: readMinutes(formData.get("actual_minutes")),
+  };
+}
+
+export async function createTaskRecord(formData: FormData) {
+  const { supabase, userId } = await getCurrentUserId();
+  const payload = readPayload(formData);
+
+  if (!payload.title) {
+    throw new Error("Görev başlığı zorunludur.");
+  }
+
+  const { error } = await supabase.from("tasks").insert({
+    user_id: userId,
+    date: payload.due_at || new Date().toISOString(),
+    ...payload,
+  });
+
+  if (error) {
+    throw new Error(`Görev eklenemedi: ${error.message}`);
+  }
+
+  revalidatePath("/tasks");
+}
+
+export async function updateTaskRecord(formData: FormData) {
+  const { supabase, userId } = await getCurrentUserId();
+  const id = cleanText(formData.get("id"));
+  const payload = readPayload(formData);
+
+  if (!id || !payload.title) {
+    throw new Error("Görev güncellemek için başlık ve kayıt kimliği zorunludur.");
+  }
+
+  const { error } = await supabase
+    .from("tasks")
+    .update(payload)
+    .eq("id", id)
+    .eq("user_id", userId);
+
+  if (error) {
+    throw new Error(`Görev güncellenemedi: ${error.message}`);
+  }
+
+  revalidatePath("/tasks");
+}
+
+export async function completeTaskRecord(formData: FormData) {
+  const { supabase, userId } = await getCurrentUserId();
+  const id = cleanText(formData.get("id"));
+
+  if (!id) {
+    throw new Error("Tamamlanacak görev bulunamadı.");
+  }
+
+  const { error } = await supabase
+    .from("tasks")
+    .update({ status: "done" })
+    .eq("id", id)
+    .eq("user_id", userId);
+
+  if (error) {
+    throw new Error(`Görev tamamlanamadı: ${error.message}`);
+  }
+
+  revalidatePath("/tasks");
+}
+
+export async function deleteTaskRecord(formData: FormData) {
+  const { supabase, userId } = await getCurrentUserId();
+  const id = cleanText(formData.get("id"));
+
+  if (!id) {
+    throw new Error("Silinecek görev bulunamadı.");
+  }
+
+  const { error } = await supabase
+    .from("tasks")
+    .delete()
+    .eq("id", id)
+    .eq("user_id", userId);
+
+  if (error) {
+    throw new Error(`Görev silinemedi: ${error.message}`);
+  }
+
+  revalidatePath("/tasks");
+}