refactor: remove agent mode switch and streamline local agent usage in the canvas assistant panel

web/src/components/canvas/canvas-agent-chat-ui.tsx

@@ -6,7 +6,6 @@ import { canvasThemes } from "@/lib/canvas-theme";
 import type { LocalUser } from "@/stores/use-user-store";
 
 export type CanvasAgentChatAttachment = { id: string; name: string; url: string };
-export type CanvasAgentMode = "online" | "local";
 export type CanvasAgentChatMessage = {
     id: string;
     role: "user" | "assistant" | "system" | "tool" | "error";
@@ -228,18 +227,6 @@ export function AgentChatComposer({
     );
 }
 
-export function AgentModeSwitch({ value, theme, onChange }: { value: CanvasAgentMode; theme: (typeof canvasThemes)[keyof typeof canvasThemes]; onChange: (value: CanvasAgentMode) => void }) {
-    return (
-        <div className="inline-flex shrink-0 rounded-lg border p-0.5 text-xs" style={{ borderColor: theme.node.stroke }}>
-            {(["online", "local"] as const).map((item) => (
-                <button key={item} type="button" className="rounded-md px-2 py-1 transition" style={{ background: value === item ? theme.node.fill : "transparent", color: value === item ? theme.node.text : theme.node.muted }} onClick={() => onChange(item)}>
-                    {item === "online" ? "网站" : "本机"}
-                </button>
-            ))}
-        </div>
-    );
-}
-
 export function AgentPanelTabs<T extends string>({ value, items, theme, right, onChange }: { value: T; items: { value: T; label: string; icon?: ReactNode; count?: number }[]; theme: (typeof canvasThemes)[keyof typeof canvasThemes]; right?: ReactNode; onChange: (value: T) => void }) {
     return (
         <div className="border-b px-3" style={{ borderColor: theme.node.stroke }}>