fix(editor): sanitize export finalizing progress

src/components/video-editor/exportStatusModel.test.ts

@@ -58,6 +58,43 @@ describe("resolveExportStatusModel", () => {
 		expect(status.isExportFinalSaveIndeterminate).toBe(true);
 	});
 
+	it("sanitizes invalid finalizing progress before rounding", () => {
+		const negativeStatus = resolveExportStatusModel({
+			isExporting: true,
+			exportProgress: progress({
+				phase: "finalizing",
+				renderProgress: -12.4,
+			}),
+			exportFormat: "mp4",
+			exportPipelineModel: "modern",
+		});
+		const infiniteStatus = resolveExportStatusModel({
+			isExporting: true,
+			exportProgress: progress({
+				phase: "finalizing",
+				renderProgress: Number.POSITIVE_INFINITY,
+			}),
+			exportFormat: "mp4",
+			exportPipelineModel: "modern",
+		});
+		const nanStatus = resolveExportStatusModel({
+			isExporting: true,
+			exportProgress: progress({
+				phase: "finalizing",
+				renderProgress: Number.NaN,
+			}),
+			exportFormat: "mp4",
+			exportPipelineModel: "modern",
+		});
+
+		expect(negativeStatus.exportFinalizingProgress).toBe(0);
+		expect(negativeStatus.exportFinalizingPercent).toBe(0);
+		expect(infiniteStatus.exportFinalizingProgress).toBe(0);
+		expect(infiniteStatus.exportFinalizingPercent).toBe(0);
+		expect(nanStatus.exportFinalizingProgress).toBe(0);
+		expect(nanStatus.exportFinalizingPercent).toBe(0);
+	});
+
 	it("keeps audio finalization out of the muxing-and-saving state", () => {
 		const status = resolveExportStatusModel({
 			isExporting: true,

src/components/video-editor/exportStatusModel.ts

@@ -35,12 +35,14 @@ export function resolveExportStatusModel({
 	const isExportFinalizing = exportProgress?.phase === "finalizing";
 	const isRenderingAudio =
 		isExportFinalizing && typeof exportProgress?.audioProgress === "number";
+	const rawFinalizingProgress =
+		typeof exportProgress?.renderProgress === "number"
+			? exportProgress.renderProgress
+			: (exportProgress?.percentage ?? 100);
 	const exportFinalizingProgress = isExportFinalizing
-		? Math.min(
-				typeof exportProgress?.renderProgress === "number"
-					? exportProgress.renderProgress
-					: (exportProgress?.percentage ?? 100),
-				100,
+		? Math.max(
+				0,
+				Math.min(100, Number.isFinite(rawFinalizingProgress) ? rawFinalizingProgress : 0),
 			)
 		: null;
 	const exportFinalizingPercent = isExportFinalizing