feat(client): add Timestamp component, ESLint 10 + Prettier, and code quality fixes

- add Timestamp component with moment relative time and ISO tooltip
- add Timestamp stories (JustNow, MinutesAgo, HoursAgo, DaysAgo, MonthsAgo)
- add ESLint 10 with typescript-eslint, react-hooks, react-refresh, prettier
- add Prettier config with singleQuote, semi, trailingComma all, printWidth 100
- add lint, lint:fix, format, test:storybook scripts to package.json
- fix react-hooks/set-state-in-effect in all page components
- auto-fix 113 Prettier formatting issues across src and .storybook

client/.storybook/stories/Table.stories.tsx

@@ -18,9 +18,9 @@ interface User {
 }
 
 const users: User[] = [
-  { id: 1, name: 'Alice Müller',  email: 'alice@example.com',  status: 'active' },
-  { id: 2, name: 'Bob Nguyen',    email: 'bob@example.com',    status: 'inactive' },
-  { id: 3, name: 'Carol Santos',  email: 'carol@example.com',  status: 'active' },
+  { id: 1, name: 'Alice Müller', email: 'alice@example.com', status: 'active' },
+  { id: 2, name: 'Bob Nguyen', email: 'bob@example.com', status: 'inactive' },
+  { id: 3, name: 'Carol Santos', email: 'carol@example.com', status: 'active' },
 ];
 
 export const Default: StoryObj<typeof Table<User>> = {
@@ -29,17 +29,15 @@ export const Default: StoryObj<typeof Table<User>> = {
     rowKey: (u) => u.id,
     emptyMessage: 'No users found.',
     columns: [
-      { key: 'id',     header: 'ID',     render: (u) => u.id,    width: 60 },
-      { key: 'name',   header: 'Name',   render: (u) => u.name },
-      { key: 'email',  header: 'Email',  render: (u) => u.email },
+      { key: 'id', header: 'ID', render: (u) => u.id, width: 60 },
+      { key: 'name', header: 'Name', render: (u) => u.name },
+      { key: 'email', header: 'Email', render: (u) => u.email },
       {
         key: 'status',
         header: 'Status',
         width: 110,
         render: (u) => (
-          <Badge variant={u.status === 'active' ? 'success' : 'neutral'}>
-            {u.status}
-          </Badge>
+          <Badge variant={u.status === 'active' ? 'success' : 'neutral'}>{u.status}</Badge>
         ),
       },
     ],