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/src/ui/Select/Select.tsx

@@ -15,7 +15,15 @@ export interface SelectProps extends Omit<React.SelectHTMLAttributes<HTMLSelectE
   placeholder?: string;
 }
 
-export function Select({ label, hint, error, options, placeholder, className, ...props }: SelectProps) {
+export function Select({
+  label,
+  hint,
+  error,
+  options,
+  placeholder,
+  className,
+  ...props
+}: SelectProps) {
   const id = useId();
   return (
     <div className={styles.wrapper}>
@@ -27,7 +35,9 @@ export function Select({ label, hint, error, options, placeholder, className, ..
       <div className={styles.control}>
         <select
           id={id}
-          className={[styles.select, error ? styles.hasError : '', className].filter(Boolean).join(' ')}
+          className={[styles.select, error ? styles.hasError : '', className]
+            .filter(Boolean)
+            .join(' ')}
           aria-describedby={error ? `${id}-error` : hint ? `${id}-hint` : undefined}
           aria-invalid={error ? true : undefined}
           {...props}
@@ -45,7 +55,13 @@ export function Select({ label, hint, error, options, placeholder, className, ..
         </select>
         <span className={styles.chevron} aria-hidden="true">
           <svg width="12" height="12" viewBox="0 0 12 12" fill="none">
-            <path d="M2 4L6 8L10 4" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" />
+            <path
+              d="M2 4L6 8L10 4"
+              stroke="currentColor"
+              strokeWidth="1.5"
+              strokeLinecap="round"
+              strokeLinejoin="round"
+            />
           </svg>
         </span>
       </div>