feat(m4): project & member management with tests and e2e

- ProjectRepository, ProjectMemberRepository, minimal NotificationRepository
- ProjectService: create/update/archive/delete project, add/remove member,
  permission checks (isMember/admin), member-added notification, getDashboard
  skeleton, getMyProjects, getMemberRole
- projectValidator, API services factory
- API routes: projects CRUD, members list/add/remove
- Screens: dashboard (project list + create form), project overview, members,
  settings; layout (Header/Sidebar/ProjectNav) and project components
- Unit tests (Project/ProjectMember repositories, ProjectService),
  integration project-member-permission, e2e project-management

components/project/ProjectSettingsForm.tsx

@@ -0,0 +1,120 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import type { Project } from '@/lib/types';
+
+export function ProjectSettingsForm({
+  project,
+  canManage,
+}: {
+  project: Project;
+  canManage: boolean;
+}) {
+  const router = useRouter();
+  const [name, setName] = useState(project.name);
+  const [description, setDescription] = useState(project.description ?? '');
+  const [status, setStatus] = useState(project.status);
+  const [error, setError] = useState<string | null>(null);
+  const [saved, setSaved] = useState(false);
+  const [loading, setLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    setSaved(false);
+
+    const res = await fetch(`/api/projects/${project.id}`, {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        name,
+        description: description || undefined,
+        status,
+      }),
+    });
+
+    setLoading(false);
+    if (res.ok) {
+      setSaved(true);
+      router.refresh();
+    } else {
+      const body = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(body?.error?.message ?? '更新に失敗しました');
+    }
+  }
+
+  if (!canManage) {
+    return (
+      <p className="text-sm text-gray-500">
+        プロジェクトの設定変更には管理者権限が必要です。
+      </p>
+    );
+  }
+
+  return (
+    <form onSubmit={onSubmit} className="space-y-4">
+      <div>
+        <label htmlFor="name" className="block text-sm font-medium">
+          プロジェクト名
+        </label>
+        <input
+          id="name"
+          type="text"
+          value={name}
+          onChange={(e) => setName(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2"
+        />
+      </div>
+      <div>
+        <label htmlFor="description" className="block text-sm font-medium">
+          説明
+        </label>
+        <textarea
+          id="description"
+          value={description}
+          onChange={(e) => setDescription(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2"
+        />
+      </div>
+      <div>
+        <label htmlFor="status" className="block text-sm font-medium">
+          ステータス
+        </label>
+        <select
+          id="status"
+          value={status}
+          onChange={(e) =>
+            setStatus(
+              e.target.value as 'active' | 'on_hold' | 'completed' | 'archived'
+            )
+          }
+          className="mt-1 rounded border px-3 py-2"
+        >
+          <option value="active">active</option>
+          <option value="on_hold">on_hold</option>
+          <option value="completed">completed</option>
+          <option value="archived">archived</option>
+        </select>
+      </div>
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+      {saved && (
+        <p className="text-sm text-green-600">プロジェクトを更新しました</p>
+      )}
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '保存中...' : '保存'}
+      </button>
+    </form>
+  );
+}