feat: add file convert stats

i think this is right? counts how many files converted (and the type)

src/lib/converters/ffmpeg.svelte.ts

@@ -79,6 +79,11 @@ export class FFmpegConverter extends Converter {
 			["converters", this.name],
 			`read ${input.name.split(".").slice(0, -1).join(".") + to} from ffmpeg virtual fs`,
 		);
+		window.plausible("convert", {
+			props: {
+				type: "audio",
+			}
+		});
 		ffmpeg.terminate();
 		return new VertFile(new File([output], input.name), to);
 	}

src/lib/converters/vertd.svelte.ts

@@ -178,6 +178,11 @@ export class VertdConverter extends Converter {
 						ws.close();
 						const url = `${apiUrl}/api/download/${msg.data.jobId}/${uploadRes.auth}`;
 						this.log(`downloading from ${url}`);
+						window.plausible("convert", {
+							props: {
+								type: "video",
+							}
+						});
 						const res = await fetch(url).then((res) => res.blob());
 						resolve(
 							new VertFile(

src/lib/converters/vips.svelte.ts

@@ -74,6 +74,11 @@ export class VipsConverter extends Converter {
 
 		if (res.type === "finished") {
 			log(["converters", this.name], `converted ${input.name} to ${to}`);
+			window.plausible("convert", {
+				props: {
+					type: "image",
+				}
+			});
 			return new VertFile(
 				new File([res.output as unknown as BlobPart], input.name),
 				to,