# Fix svelte-check errors and warnings

Branch: `svelte-check-fixes` → `main`

## What changed

bajdev's `npm run check` on the M4 code reported 4 errors and 3 warnings. This fixes all of them. (The fix was first pushed to `fit-window` after that PR had already been merged, so it comes as its own PR.)

- **Errors** (`App.svelte`): the generated bindings type Go slices as `Pad[] | null`, because a nil Go slice encodes as `null`. Go always sends arrays, so `App.svelte` now reads `st?.pads ?? []` once and uses that everywhere.
- **Warnings**:
  - The Pads and Sequences panels were `<main role="tabpanel">`, which Svelte flags; they are now `<div>`s.
  - The About backdrop (a click outside the dialog closes it) had a `svelte-ignore` with its two codes separated by a space. Svelte 5 needs a comma, so the ignore didn't apply. Escape and the Close button already cover the keyboard.

No layout or behaviour changes.

## Testing

The server has no Node, so svelte-check hasn't been run there. Please run on the laptop:

1. `npm run check` in `frontend`: 0 errors and 0 warnings.
2. `wails3 dev`: the app looks and behaves as before (both tabs, About opens and closes).