fix: address final export pipeline review follow-ups

src/lib/exporter/forwardFrameSource.ts

@@ -47,13 +47,17 @@ export class ForwardFrameSource {
 			const url = new URL(resourceUrl);
 			let filePath = decodeURIComponent(url.pathname);
 			if (url.host && url.host !== "localhost") {
-				return `//${url.host}${filePath}`;
+				return `\\\\${url.host}${filePath.replace(/\//g, "\\")}`;
 			}
 			if (/^\/[A-Za-z]:/.test(filePath)) {
 				filePath = filePath.slice(1);
 			}
 			return filePath;
 		} catch {
+			const uncMatch = resourceUrl.match(/^file:\/\/([^/]+)(\/.*)$/i);
+			if (uncMatch && uncMatch[1].toLowerCase() !== "localhost") {
+				return `\\\\${uncMatch[1]}${decodeURIComponent(uncMatch[2]).replace(/\//g, "\\")}`;
+			}
 			return resourceUrl.replace(/^file:\/\//, "");
 		}
 	}

src/lib/exporter/videoExporter.ts

@@ -565,7 +565,7 @@ export class VideoExporter {
 				if (this.cancelled || !this.nativeExportSessionId) return;
 				const buffer = new ArrayBuffer(chunk.byteLength);
 				chunk.copyTo(buffer);
-				const writePromise = (this.nativePendingWrite = this.nativePendingWrite
+				const writePromise = this.nativePendingWrite
 					.then(async () => {
 						const writeResult = await window.electronAPI.nativeVideoExportWriteFrame(
 							sessionId,
@@ -586,7 +586,8 @@ export class VideoExporter {
 							this.nativeWriteError =
 								error instanceof Error ? error : new Error(String(error));
 						}
-					}));
+					});
+				this.nativePendingWrite = writePromise;
 				this.trackNativeWritePromise(writePromise);
 			},
 			error: (e) => {
@@ -842,7 +843,7 @@ export class VideoExporter {
 			return;
 		}
 
-		await oldestWritePromise;
+		await this.awaitWithFinalizationTimeout(oldestWritePromise, "native frame write");
 
 		if (this.nativeWriteError) {
 			throw this.nativeWriteError;