fix: drop removed WEBCAM_TARGET width/height refs after main merge

PR #600 (now on main) removed WEBCAM_TARGET_WIDTH/HEIGHT and switched
this call site to width/height: 0 so the native helper picks the
camera's native dimensions. Align this branch with that so CI's
fresh PR-merge stops erroring on the undeclared identifiers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/hooks/useScreenRecorder.ts

@@ -989,8 +989,8 @@ export function useScreenRecorder(): UseScreenRecorderReturn {
 					enabled: webcamEnabled,
 					deviceId: webcamDeviceId,
 					deviceName: webcamDeviceName,
-					width: WEBCAM_TARGET_WIDTH,
-					height: WEBCAM_TARGET_HEIGHT,
+					width: 0,
+					height: 0,
 					fps: WEBCAM_TARGET_FRAME_RATE,
 				},
 				cursor: {