fix: cap camera snap payload size

apps/shared/ClawdisKit/Tests/ClawdisKitTests/JPEGTranscoderTests.swift

@@ -47,6 +47,52 @@ import UniformTypeIdentifiers
         return out as Data
     }
 
+    private func makeNoiseJPEG(width: Int, height: Int) throws -> Data {
+        let bytesPerPixel = 4
+        let byteCount = width * height * bytesPerPixel
+        var data = Data(count: byteCount)
+        let cs = CGColorSpaceCreateDeviceRGB()
+        let bitmapInfo = CGImageAlphaInfo.premultipliedLast.rawValue
+
+        let out = try data.withUnsafeMutableBytes { rawBuffer -> Data in
+            guard let base = rawBuffer.baseAddress?.assumingMemoryBound(to: UInt8.self) else {
+                throw NSError(domain: "JPEGTranscoderTests", code: 6)
+            }
+            for idx in 0..<byteCount {
+                base[idx] = UInt8.random(in: 0...255)
+            }
+
+            guard
+                let ctx = CGContext(
+                    data: base,
+                    width: width,
+                    height: height,
+                    bitsPerComponent: 8,
+                    bytesPerRow: width * bytesPerPixel,
+                    space: cs,
+                    bitmapInfo: bitmapInfo)
+            else {
+                throw NSError(domain: "JPEGTranscoderTests", code: 7)
+            }
+
+            guard let img = ctx.makeImage() else {
+                throw NSError(domain: "JPEGTranscoderTests", code: 8)
+            }
+
+            let encoded = NSMutableData()
+            guard let dest = CGImageDestinationCreateWithData(encoded, UTType.jpeg.identifier as CFString, 1, nil) else {
+                throw NSError(domain: "JPEGTranscoderTests", code: 9)
+            }
+            CGImageDestinationAddImage(dest, img, nil)
+            guard CGImageDestinationFinalize(dest) else {
+                throw NSError(domain: "JPEGTranscoderTests", code: 10)
+            }
+            return encoded as Data
+        }
+
+        return out
+    }
+
     @Test func downscalesToMaxWidthPx() throws {
         let input = try makeSolidJPEG(width: 2000, height: 1000)
         let out = try JPEGTranscoder.transcodeToJPEG(imageData: input, maxWidthPx: 1600, quality: 0.9)
@@ -69,5 +115,14 @@ import UniformTypeIdentifiers
         #expect(out.widthPx == 1000)
         #expect(out.heightPx == 2000)
     }
-}
 
+    @Test func respectsMaxBytes() throws {
+        let input = try makeNoiseJPEG(width: 1600, height: 1200)
+        let out = try JPEGTranscoder.transcodeToJPEG(
+            imageData: input,
+            maxWidthPx: 1600,
+            quality: 0.95,
+            maxBytes: 180_000)
+        #expect(out.data.count <= 180_000)
+    }
+}