fix(recording): keep embedded audio fallbacks safe

electron/ipc/recording/diagnostics.ts

@@ -512,8 +512,7 @@ export async function getCompanionAudioFallbackInfo(videoPath: string) {
 			new Set(
 				companionCandidates.flatMap((candidate) =>
 					candidate.usablePaths.filter(
-						(companionPath) =>
-							companionPath === candidate.micPath || companionPath === candidate.systemPath,
+						(companionPath) => companionPath === candidate.micPath,
 					),
 				),
 			),

electron/ipc/recording/prune.ts

@@ -82,11 +82,11 @@ async function loadSavedProjectMediaPaths() {
 						editor?: { webcam?: { sourcePath?: unknown } };
 					}>(await fs.readFile(projectPath, "utf-8"));
 				} catch (error) {
-					console.warn("[prune] Skipping unreadable project while pruning recordings", {
+					console.warn("[prune] Aborting recording prune because a saved project is unreadable", {
 						projectPath,
 						error,
 					});
-					return;
+					throw error;
 				}
 				const candidatePaths = [
 					rawProject.videoPath,

src/lib/exporter/audioEncoder.test.ts

@@ -14,8 +14,8 @@ type OfflineRenderTestHarness = AudioProcessor & {
 		sourceAudioFallbackPaths: string[],
 		sourceAudioFallbackStartDelayMsByPath?: Record<string, number>,
 	): Promise<{
-		mainBuffer: AudioBuffer | null;
-		companionEntries: Array<{ buffer: AudioBuffer; startDelaySec: number }>;
+		mainBufferEntry: { buffer: AudioBuffer; gain: number } | null;
+		companionEntries: Array<{ buffer: AudioBuffer; startDelaySec: number; gain: number }>;
 	}>;
 	renderAndMuxOfflineAudio(
 		videoUrl: string,
@@ -55,7 +55,8 @@ describe("AudioProcessor offline render preparation", () => {
 			["/tmp/recording.mp4", "/tmp/recording.mic.wav"],
 		);
 
-		expect(prepared.mainBuffer).toBe(mainBuffer);
+		expect(prepared.mainBufferEntry?.buffer).toBe(mainBuffer);
+		expect(prepared.mainBufferEntry?.gain).toBe(1);
 		expect(prepared.companionEntries).toHaveLength(1);
 		expect(prepared.companionEntries[0]?.buffer).toBe(micBuffer);
 		expect(decodeAudioFromUrl).toHaveBeenCalledWith("file:///tmp/recording.mp4");