add login/sign-up page with dark/light mode

prisma/migrations/20260404225425_init/migration.sql

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+-- CreateTable
+CREATE TABLE "Task" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "task_name" TEXT NOT NULL,
+    "time_needed" INTEGER NOT NULL,
+    "complexity" INTEGER NOT NULL,
+    "check" BOOLEAN NOT NULL
+);

prisma/migrations/migration_lock.toml

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+# Please do not edit this file manually
+# It should be added in your version-control system (e.g., Git)
+provider = "sqlite"

prisma/schema.prisma

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+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "mysql"
+  url      = env("DATABASE_URL")
+}
+
+model Task {
+  id          Int     @id @default(autoincrement())
+  task_name   String
+  time_needed Int
+  complexity  Int
+  check       Boolean
+}