fix(console-ui): render binary invocation output safely

- decode UTF-8 responses in fatal mode and reject control-byte payloads
- fall back to hexadecimal output instead of replacement characters
- show response byte count, selected representation, automatic fallback, and latency
- preserve the existing counter u64 representation and cover the wiring in SSR tests

console/src/routes/index.tsx

@@ -191,16 +191,65 @@ function invocationInputSize(value: string, format: "utf8" | "hex") {
   }
 }
 
+type FormattedInvocationOutput = {
+  text: string;
+  format: "UTF-8" | "HEX" | "U64 LE";
+  automatic: boolean;
+};
+
+function formatHex(bytes: Uint8Array) {
+  return Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0")).join(" ");
+}
+
+function decodeReadableUtf8(bytes: Uint8Array) {
+  let text: string;
+  try {
+    text = new TextDecoder("utf-8", { fatal: true }).decode(bytes);
+  } catch {
+    return null;
+  }
+
+  for (const character of text) {
+    const codePoint = character.codePointAt(0) ?? 0;
+    const allowedWhitespace = codePoint === 0x09 || codePoint === 0x0a || codePoint === 0x0d;
+    if ((codePoint < 0x20 && !allowedWhitespace) || codePoint === 0x7f) {
+      return null;
+    }
+  }
+  return text;
+}
+
 function formatInvocationOutput(service: Service, output: Uint8Array, format: "utf8" | "hex") {
   if (service.id === "counter" && output.byteLength === 8) {
-    return new DataView(output.buffer, output.byteOffset, output.byteLength)
+    return {
+      text: new DataView(output.buffer, output.byteOffset, output.byteLength)
         .getBigUint64(0, true)
-      .toString();
+        .toString(),
+      format: "U64 LE",
+      automatic: false,
+    } satisfies FormattedInvocationOutput;
   }
   if (format === "hex") {
-    return Array.from(output, (byte) => byte.toString(16).padStart(2, "0")).join(" ");
+    return {
+      text: formatHex(output) || "(empty)",
+      format: "HEX",
+      automatic: false,
+    } satisfies FormattedInvocationOutput;
   }
-  return new TextDecoder().decode(output) || "(empty)";
+
+  const text = decodeReadableUtf8(output);
+  if (text !== null) {
+    return {
+      text: text || "(empty)",
+      format: "UTF-8",
+      automatic: false,
+    } satisfies FormattedInvocationOutput;
+  }
+  return {
+    text: formatHex(output),
+    format: "HEX",
+    automatic: true,
+  } satisfies FormattedInvocationOutput;
 }
 
 export const Route = createFileRoute("/")({
@@ -1841,6 +1890,8 @@ function InvokeDialog({
   const [input, setInput] = useState(service.id === "echo" ? "hello wasm" : "");
   const [format, setFormat] = useState<"utf8" | "hex">("utf8");
   const [output, setOutput] = useState("");
+  const [outputBytes, setOutputBytes] = useState<number | null>(null);
+  const [outputFormat, setOutputFormat] = useState<FormattedInvocationOutput | null>(null);
   const [running, setRunning] = useState(false);
   const [failed, setFailed] = useState(false);
   const [latency, setLatency] = useState<number | null>(null);
@@ -1848,11 +1899,16 @@ function InvokeDialog({
   async function invoke() {
     setRunning(true);
     setOutput("");
+    setOutputBytes(null);
+    setOutputFormat(null);
     setFailed(false);
     setLatency(null);
     try {
       const result = await onInvoke(service, parseInvocationInput(input, format));
-      setOutput(formatInvocationOutput(service, result.output, format));
+      const formatted = formatInvocationOutput(service, result.output, format);
+      setOutput(formatted.text);
+      setOutputBytes(result.outputBytes);
+      setOutputFormat(formatted);
       setLatency(result.latencyMs);
     } catch (invokeError) {
       setFailed(true);
@@ -1871,7 +1927,7 @@ function InvokeDialog({
     >
       <div className="invoke-body">
         <div className="invoke-toolbar">
-          <div className="segmented">
+          <div className="segmented" aria-label="输入编码">
             <button
               type="button"
               className={format === "utf8" ? "active" : ""}
@@ -1902,11 +1958,17 @@ function InvokeDialog({
         <div className={failed ? "invoke-output failed" : "invoke-output"}>
           <div>
             <span>输出</span>
-            {output && latency !== null && (
+            {output && latency !== null && outputBytes !== null && outputFormat && (
+              <div className="invoke-output-meta">
+                <span>
+                  {outputBytes} B · {outputFormat.format}
+                  {outputFormat.automatic ? " · 自动" : ""}
+                </span>
                 <small>
                   <Clock3 size={13} />
                   {latency} ms
                 </small>
+              </div>
             )}
           </div>
           <pre>{running ? "invoking..." : output || "等待调用"}</pre>

console/src/styles/app.css

@@ -1783,6 +1783,18 @@ button:disabled {
   justify-content: space-between;
 }
 
+.invoke-output-meta {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.invoke-output-meta > span {
+  color: var(--ink-faint);
+  font-family: var(--font-geist-mono), monospace;
+  font-size: 8px;
+}
+
 .invoke-output small {
   display: flex;
   align-items: center;

console/tests/rendered-html.test.mjs

@@ -99,6 +99,8 @@ test("uses TanStack Start routing and produces Node artifacts", async () => {
   assert.match(indexRoute, /切换对外版本/);
   assert.match(indexRoute, /Host 能力/);
   assert.match(indexRoute, /service\.capabilities/);
+  assert.match(indexRoute, /TextDecoder\("utf-8", \{ fatal: true \}\)/);
+  assert.match(indexRoute, /outputFormat\.automatic/);
   assert.match(apiClient, /\/api\/v1\/deployments/);
   assert.match(apiClient, /capabilities: BackendCapability\[\]/);
   assert.match(router, /createRouter/);