Element: #092 Animated (feedback/progress)
What it shows: A progress bar that fills from 0 to 100 percent in steps of 5 every 100 ms when Start upload is clicked.
When to use: Showing upload or export progress that the app updates as work completes.
Spec:
- `` with `let value = $state(0)`
- `setInterval` runs every `100` ms with `value = Math.min(100, value + 5)` and clears at 100
- Percent text `{value}%` shown beside the bar
- Button `