feat(sidebar): 最近会话行首显示最后一轮使用的模型图标

crates/agent-ui/src/components/ProviderBrandIcon.tsx

@@ -0,0 +1,36 @@
+import {
+  ClaudeIcon,
+  DeepseekIcon,
+  GeminiIcon,
+  GrokIcon,
+  OpenaiChatgptIcon,
+} from "@liveagent/ui/components/IconSet";
+import type { ProviderId } from "@liveagent/ui/lib/settings/types";
+import { cn } from "@liveagent/ui/lib/shared/utils";
+
+const KNOWN_PROVIDER_IDS: readonly ProviderId[] = [
+  "codex",
+  "claude_code",
+  "gemini",
+  "xai",
+  "deepseek",
+];
+
+// Sidebar rows carry providerId as a wide string: legacy rows persist "",
+// GUI optimistic rows may fall back to "pending", and web optimistic rows
+// store a custom provider *instance* id. Only enum hits may reach the icon —
+// anything else would render as the OpenAI fallback below.
+export function isKnownProviderId(value: string | undefined): value is ProviderId {
+  return (KNOWN_PROVIDER_IDS as readonly string[]).includes(value ?? "");
+}
+
+// Unmatched types (including "codex") fall through to the OpenAI icon; callers
+// that need "unknown renders nothing" must guard with isKnownProviderId first.
+export function ProviderBrandIcon({ type, className }: { type?: ProviderId; className?: string }) {
+  const cls = cn("h-4 w-4 shrink-0", className);
+  if (type === "claude_code") return <ClaudeIcon className={cls} />;
+  if (type === "gemini") return <GeminiIcon className={cls} />;
+  if (type === "xai") return <GrokIcon className={cls} />;
+  if (type === "deepseek") return <DeepseekIcon className={cls} />;
+  return <OpenaiChatgptIcon className={cn(cls, "fill-current dark:text-white")} />;
+}

crates/agent-ui/src/components/chat/ChatHistorySidebarRows.tsx

@@ -56,6 +56,7 @@ import {
 } from "react";
 import type { SidebarConversation } from "../../lib/sidebar/types";
 import type { WorkspaceProjectGroup } from "../../lib/workspaceProjectTypes";
+import { isKnownProviderId, ProviderBrandIcon } from "../ProviderBrandIcon";
 
 export type WorkspaceProjectRemoveOptions = {
   deleteWorktree?: boolean;
@@ -126,6 +127,8 @@ function areRenderedHistoryItemsEqual(previous: SidebarConversation, next: Sideb
   return (
     previous.id === next.id &&
     previous.title === next.title &&
+    previous.providerId === next.providerId &&
+    previous.model === next.model &&
     previous.cwd === next.cwd &&
     previous.isPinned === next.isPinned &&
     previous.isShared === next.isShared &&
@@ -700,6 +703,15 @@ export const HistoryRow = memo(function HistoryRow(props: HistoryRowProps) {
                     {isSelected ? <Check className="h-3 w-3" /> : null}
                   </span>
                 ) : null}
+                {!isSelectionMode && isKnownProviderId(item.providerId) ? (
+                  <span
+                    aria-hidden="true"
+                    title={item.model || undefined}
+                    className="flex h-4 w-4 shrink-0 items-center justify-center"
+                  >
+                    <ProviderBrandIcon type={item.providerId} />
+                  </span>
+                ) : null}
                 <span className="sidebar-project-name-fade min-w-0 flex-1 overflow-hidden whitespace-nowrap text-[calc(14px*var(--zone-font-scale,1))] font-normal leading-5">
                   {item.title}
                 </span>

crates/agent-ui/src/components/chat/ComposerModelControls.tsx

@@ -12,20 +12,16 @@ import {
   ArrowDownAZ,
   Check,
   ChevronDown,
-  ClaudeIcon,
-  DeepseekIcon,
-  GeminiIcon,
   Globe,
   GlobeOff,
-  GrokIcon,
   Layers,
   Lightbulb,
   LightbulbOff,
-  OpenaiChatgptIcon,
   Pencil,
   Search,
   Sparkle,
 } from "@liveagent/ui/components/IconSet";
+import { ProviderBrandIcon } from "@liveagent/ui/components/ProviderBrandIcon";
 import { Button } from "@liveagent/ui/components/ui/button";
 import { Popover, PopoverContent, PopoverTrigger } from "@liveagent/ui/components/ui/popover";
 import { useLocale } from "@liveagent/ui/i18n/index";
@@ -66,15 +62,6 @@ const REASONING_COMPACT_I18N_KEYS: Record<ReasoningLevel, string> = {
   max: "chat.runtime.reasoningCompact.max",
 };
 
-function ProviderBrandIcon({ type, className }: { type: ProviderId; className?: string }) {
-  const cls = cn("h-4 w-4 shrink-0", className);
-  if (type === "claude_code") return <ClaudeIcon className={cls} />;
-  if (type === "gemini") return <GeminiIcon className={cls} />;
-  if (type === "xai") return <GrokIcon className={cls} />;
-  if (type === "deepseek") return <DeepseekIcon className={cls} />;
-  return <OpenaiChatgptIcon className={cn(cls, "fill-current dark:text-white")} />;
-}
-
 function RuntimeToggleChip(props: {
   pressed: boolean;
   disabled?: boolean;

crates/agent-ui/src/pages/settings/ProviderPresentation.tsx

@@ -118,6 +118,8 @@ export function getProviderLabel(type: ProviderId) {
   return PROVIDER_LABELS[type];
 }
 
+// TODO: converge with components/ProviderBrandIcon.tsx — this variant keeps the
+// settings-page sizing contract (height="1em" scales with surrounding text).
 export function ProviderBrandIcon({ type }: { type: ProviderId }) {
   if (type === "claude_code") return <ClaudeIcon height="1em" />;
   if (type === "gemini") return <GeminiIcon height="1em" />;

crates/agent-ui/src/pages/settings/modelPicker.tsx

@@ -1,15 +1,6 @@
 import type { ProviderId } from "@liveagent/app/lib/settings/index";
-import {
-  Check,
-  ChevronDown,
-  ClaudeIcon,
-  DeepseekIcon,
-  GeminiIcon,
-  GrokIcon,
-  OpenaiChatgptIcon,
-  Search,
-  Sparkles,
-} from "@liveagent/ui/components/IconSet";
+import { Check, ChevronDown, Search, Sparkles } from "@liveagent/ui/components/IconSet";
+import { ProviderBrandIcon } from "@liveagent/ui/components/ProviderBrandIcon";
 import {
   DropdownMenu,
   DropdownMenuContent,
@@ -34,15 +25,6 @@ export type ModelPickerOption = {
   providerType?: ProviderId;
 };
 
-function ProviderBrandIcon({ type, className }: { type?: ProviderId; className?: string }) {
-  const cls = cn("h-4 w-4 shrink-0", className);
-  if (type === "claude_code") return <ClaudeIcon className={cls} />;
-  if (type === "gemini") return <GeminiIcon className={cls} />;
-  if (type === "xai") return <GrokIcon className={cls} />;
-  if (type === "deepseek") return <DeepseekIcon className={cls} />;
-  return <OpenaiChatgptIcon className={cn(cls, "fill-current dark:text-white")} />;
-}
-
 type ModelGroup = {
   id: string;
   name: string;