feat(dashboard): implement daily journal functionality with CRUD operations

- Added actions for creating, updating, and deleting daily log records in `actions.ts`.
- Introduced `journal-client.tsx` for rendering the journal UI, including log entries and statistics.
- Refactored `page.tsx` to fetch user-specific daily logs from Supabase and display them using the new client component.
- Implemented form handling for daily log creation and updates, including mood and energy scoring.

app/(dashboard)/journal/actions.ts

@@ -0,0 +1,106 @@
+"use server";
+
+import { createClient } from "@/lib/supabase/server";
+import { revalidatePath } from "next/cache";
+
+function cleanText(value: FormDataEntryValue | null) {
+  const text = typeof value === "string" ? value.trim() : "";
+  return text.length > 0 ? text : null;
+}
+
+function readScore(value: FormDataEntryValue | null) {
+  const score = Number(typeof value === "string" ? value : value?.toString());
+  return Number.isInteger(score) && score >= 1 && score <= 5 ? score : null;
+}
+
+async function getCurrentUserId() {
+  const supabase = await createClient();
+  const {
+    data: { user },
+    error,
+  } = await supabase.auth.getUser();
+
+  if (error || !user) {
+    throw new Error("Günlük kaydı için giriş yapmış kullanıcı bulunamadı.");
+  }
+
+  return { supabase, userId: user.id };
+}
+
+function readPayload(formData: FormData) {
+  return {
+    log_date: cleanText(formData.get("log_date")) || new Date().toISOString().slice(0, 10),
+    mood_score: readScore(formData.get("mood_score")),
+    energy_score: readScore(formData.get("energy_score")),
+    work_satisfaction_score: readScore(formData.get("work_satisfaction_score")),
+    note: cleanText(formData.get("note")),
+  };
+}
+
+export async function createDailyLogRecord(formData: FormData) {
+  const { supabase, userId } = await getCurrentUserId();
+  const payload = readPayload(formData);
+
+  if (!payload.mood_score || !payload.energy_score) {
+    throw new Error("Mood ve enerji skorları zorunludur.");
+  }
+
+  const { error } = await supabase
+    .from("daily_logs")
+    .upsert(
+      {
+        user_id: userId,
+        ...payload,
+      },
+      { onConflict: "user_id,log_date" },
+    );
+
+  if (error) {
+    throw new Error(`Günlük kaydı eklenemedi: ${error.message}`);
+  }
+
+  revalidatePath("/journal");
+}
+
+export async function updateDailyLogRecord(formData: FormData) {
+  const { supabase, userId } = await getCurrentUserId();
+  const id = cleanText(formData.get("id"));
+  const payload = readPayload(formData);
+
+  if (!id || !payload.mood_score || !payload.energy_score) {
+    throw new Error("Günlük kaydını güncellemek için kayıt kimliği, mood ve enerji skorları zorunludur.");
+  }
+
+  const { error } = await supabase
+    .from("daily_logs")
+    .update(payload)
+    .eq("id", id)
+    .eq("user_id", userId);
+
+  if (error) {
+    throw new Error(`Günlük kaydı güncellenemedi: ${error.message}`);
+  }
+
+  revalidatePath("/journal");
+}
+
+export async function deleteDailyLogRecord(formData: FormData) {
+  const { supabase, userId } = await getCurrentUserId();
+  const id = cleanText(formData.get("id"));
+
+  if (!id) {
+    throw new Error("Silinecek günlük kaydı bulunamadı.");
+  }
+
+  const { error } = await supabase
+    .from("daily_logs")
+    .delete()
+    .eq("id", id)
+    .eq("user_id", userId);
+
+  if (error) {
+    throw new Error(`Günlük kaydı silinemedi: ${error.message}`);
+  }
+
+  revalidatePath("/journal");
+}