fix(recorder): manually construct clip instead of using ffmpeg (close #25)

Too many segments will make ffmpeg command spawn with long argument, which might
be exceeded the limit.
Now we manually copy and write segments into one file to generate a clip.
FFMPEG is still remained but not used for now, in the future clip encoding might
need this.

Signed-off-by: Xinrea <xinreas@outlook.com>

vite.config.ts

@@ -8,6 +8,7 @@ const mobile =
   process.env.TAURI_PLATFORM === "ios";
 
 // https://vitejs.dev/config/
+// @ts-ignore
 export default defineConfig(async () => ({
   plugins: [
     svelte({