<!-- source-hash: ef5c9d8b68965c2da06659a1d3d16ae7 -->
Locale-aware date and time formatters built on `Intl.DateTimeFormat` with the user's locale (no hardcoded locale). Mirrors `src/lib/format-date.ts` from the openframe-frontend app so both codebases render dates the same way — american (`05/05/2026`) or european (`05.05.2026`) format depending on the user's locale.

## Key Components

- `formatDate()` - Short locale-formatted date (`dateStyle: 'short'`)
- `formatTime()` - Short locale-formatted time (`timeStyle: 'short'`)

All formatters accept `string | number | Date` input and guard against invalid dates, returning the `—` placeholder instead of throwing `RangeError: Invalid time value`.

## Usage Example

```typescript
import { formatDate, formatTime } from './format-date';

// Locale-formatted date
const date = formatDate('2026-05-05T14:47:00Z');
// Returns: "05/05/2026" (en-US) or "05.05.2026" (european locales)

// Locale-formatted time
const time = formatTime('2026-05-05T14:47:00Z');
// Returns: "2:47 PM" (en-US) or "14:47" (european locales)

// Invalid input falls back to a placeholder
const missing = formatDate('not-a-date');
// Returns: "—"
```

Used by the chat message timestamp (`components/chat/chat-message-enhanced.tsx`): messages from a previous day show `formatDate` + `formatTime`, today's messages show `formatTime` only.