Bunch of updates in preparation for publish

examples/preact/types.d.ts

@@ -0,0 +1,9 @@
+type AppState =
+  | { type: 'CameraPicker' }
+  | { type: 'Status'; message: string }
+  | {
+      type: 'Config';
+      config: import('web-gphoto2').Config;
+      capturePreview: (() => Promise<Blob>) | undefined;
+      triggerCapture: (() => Promise<File>) | undefined;
+    };