fix: align camera payload caps

apps/macos/Sources/Clawdis/CameraCaptureService.swift

@@ -79,7 +79,14 @@ actor CameraCaptureService {
         }
         withExtendedLifetime(delegate) {}
 
-        let res = try JPEGTranscoder.transcodeToJPEG(imageData: rawData, maxWidthPx: maxWidth, quality: quality)
+        let maxPayloadBytes = 5 * 1024 * 1024
+        // Base64 inflates payloads by ~4/3; cap encoded bytes so the payload stays under 5MB (API limit).
+        let maxEncodedBytes = (maxPayloadBytes / 4) * 3
+        let res = try JPEGTranscoder.transcodeToJPEG(
+            imageData: rawData,
+            maxWidthPx: maxWidth,
+            quality: quality,
+            maxBytes: maxEncodedBytes)
         return (data: res.data, size: CGSize(width: res.widthPx, height: res.heightPx))
     }