🤖 feat: display mux gateway models with provider icon and suffix (#790)

- Add mux.svg icon (black/white M logo matching other provider styles)
- Parse mux-gateway:provider/model format to extract inner provider
- Show dual icons: mux icon + inner provider icon (e.g., Anthropic)
- Append "(mux gateway)" suffix to display name
- Model name formatting uses existing formatModelDisplayName()

Example: mux-gateway:anthropic/claude-opus-4-5 displays as: [mux]
[anthropic] Opus 4.5 (mux gateway)

Author: ibetitsmike

src/browser/assets/icons/mux.svg

@@ -2,6 +2,7 @@ import React from "react";
 import AnthropicIcon from "@/browser/assets/icons/anthropic.svg?react";
 import OpenAIIcon from "@/browser/assets/icons/openai.svg?react";
 import AWSIcon from "@/browser/assets/icons/aws.svg?react";
+import MuxIcon from "@/browser/assets/icons/mux.svg?react";
 import { TooltipWrapper, Tooltip } from "@/browser/components/Tooltip";
 import { formatModelDisplayName } from "@/common/utils/ai/modelDisplay";
 
@@ -11,46 +12,83 @@ interface ModelDisplayProps {
   showTooltip?: boolean;
 }
 
+/**
+ * Parse a model string into provider and model name.
+ * Handles mux-gateway format: "mux-gateway:inner-provider/model-name"
+ * Returns: { provider, modelName, isMuxGateway, innerProvider }
+ */
+function parseModelString(modelString: string): {
+  provider: string;
+  modelName: string;
+  isMuxGateway: boolean;
+  innerProvider: string;
+} {
+  const [provider, rest] = modelString.includes(":")
+    ? modelString.split(":", 2)
+    : ["", modelString];
+
+  // Handle mux-gateway format: mux-gateway:anthropic/claude-sonnet-4-5
+  if (provider === "mux-gateway" && rest.includes("/")) {
+    const [innerProvider, modelName] = rest.split("/", 2);
+    return { provider, modelName, isMuxGateway: true, innerProvider };
+  }
+
+  return { provider, modelName: rest, isMuxGateway: false, innerProvider: "" };
+}
+
+/** Get icon component for a provider name */
+function getProviderIcon(provider: string): React.ReactNode {
+  switch (provider) {
+    case "anthropic":
+      return <AnthropicIcon />;
+    case "openai":
+      return <OpenAIIcon />;
+    case "bedrock":
+      return <AWSIcon />;
+    case "mux-gateway":
+      return <MuxIcon />;
+    default:
+      return null;
+  }
+}
+
 /**
  * Display a model name with its provider icon.
  * Supports format "provider:model-name" (e.g., "anthropic:claude-sonnet-4-5")
+ * Also supports mux-gateway: "mux-gateway:anthropic/claude-sonnet-4-5"
+ *   -> Shows mux icon + inner provider icon + model name + "(mux gateway)"
  *
  * Uses standard inline layout for natural text alignment.
  * Icon is 1em (matches font size) with vertical-align: middle.
  */
 export const ModelDisplay: React.FC<ModelDisplayProps> = ({ modelString, showTooltip = true }) => {
-  const [provider, modelName] = modelString.includes(":")
-    ? modelString.split(":", 2)
-    : ["", modelString];
+  const { provider, modelName, isMuxGateway, innerProvider } = parseModelString(modelString);
 
-  // Map provider names to their icons
-  const getProviderIcon = () => {
-    switch (provider) {
-      case "anthropic":
-        return <AnthropicIcon />;
-      case "openai":
-        return <OpenAIIcon />;
-      case "bedrock":
-        return <AWSIcon />;
-      default:
-        return null;
-    }
-  };
-
-  const providerIcon = getProviderIcon();
+  // For mux-gateway, show the inner provider's icon (the model's actual provider)
+  const providerIcon = isMuxGateway ? getProviderIcon(innerProvider) : getProviderIcon(provider);
+  const muxIcon = isMuxGateway ? getProviderIcon("mux-gateway") : null;
   const displayName = formatModelDisplayName(modelName);
+  const suffix = isMuxGateway ? " (mux gateway)" : "";
+
+  const iconClass =
+    "mr-[0.3em] inline-block h-[1.1em] w-[1.1em] align-[-0.19em] [&_svg]:block [&_svg]:h-full [&_svg]:w-full [&_svg_.st0]:fill-current [&_svg_circle]:!fill-current [&_svg_path]:!fill-current [&_svg_rect]:!fill-current";
 
   const content = (
     <span className="inline normal-case" data-model-display>
+      {muxIcon && (
+        <span className={iconClass} data-model-icon="mux">
+          {muxIcon}
+        </span>
+      )}
       {providerIcon && (
-        <span
-          className="mr-[0.3em] inline-block h-[1.1em] w-[1.1em] align-[-0.19em] [&_svg]:block [&_svg]:h-full [&_svg]:w-full [&_svg_.st0]:fill-current [&_svg_circle]:!fill-current [&_svg_path]:!fill-current [&_svg_rect]:!fill-current"
-          data-model-icon
-        >
+        <span className={iconClass} data-model-icon>
           {providerIcon}
         </span>
       )}
-      <span className="inline">{displayName}</span>
+      <span className="inline">
+        {displayName}
+        {suffix}
+      </span>
     </span>
   );