feat(web): 聊天背景渲染 + 思维链/工具卡富化

- persona.ts: 新增 personaChatBackground(p, orientation)，只取本角色对应方向的图
- ChatShell.tsx: 按横/竖屏渲染角色聊天背景（衬底+scrim），null/无图回退纯 Miuix 面
- chat.tsx: 思维链块加图标 chip+spinner+收起预览；工具卡加状态色 chip+ok/fail Tag
- 红线: 绝不 fallback 昔涟/其它角色；TemplateCard detail 折叠判定等行为不变

frontend/web/src/components/chat.tsx

@@ -8,7 +8,9 @@ import { WakePath } from "./status";
 import { modeBody } from "./messages";
 import { renderContent } from "../lib/renderContent";
 
-/** Collapsible inline chain-of-thought block. */
+/** Collapsible inline chain-of-thought block. A Miuix disclosure row: icon chip
+ *  + label, spinner when still thinking, and a single-line muted preview of the
+ *  reasoning while collapsed so the block reads at a glance. */
 export function ThinkingBlock({
   text,
   streaming,
@@ -23,26 +25,39 @@ export function ThinkingBlock({
     <div className="mb-2 overflow-hidden rounded-[var(--mu-radius-sm)] border border-[var(--mu-glass-border)] bg-[var(--mu-surface-2)]/60">
       <button
         onClick={() => setOpen((v) => !v)}
-        className="flex w-full items-center gap-1.5 px-3 py-1.5 text-xs text-[var(--mu-text-lo)]"
+        className="flex w-full items-center gap-2 px-3 py-2 text-xs transition-colors duration-200 hover:bg-[var(--mu-surface-4)]/40"
       >
+        <span className="inline-flex h-5 w-5 shrink-0 items-center justify-center rounded-[var(--mu-radius-xs)] bg-[var(--mu-accent)]/15 text-[var(--mu-accent)]">
+          <Icon name="memory" size={13} />
+        </span>
+        <span className="font-medium text-[var(--mu-text-mid)]">思维链</span>
+        {streaming && !text ? (
+          <span className="inline-flex items-center gap-1 text-[var(--mu-text-lo)]">
+            <Icon name="refresh" size={11} className="animate-spin" />
+            思考中…
+          </span>
+        ) : (
+          <span className="text-[var(--mu-text-lo)]">{open ? "收起" : "展开"}</span>
+        )}
         <span
-          className={`inline-block transition-transform duration-200 ${open ? "rotate-90" : ""}`}
+          className={`ml-auto transition-transform duration-200 ease-[var(--mu-spring)] ${open ? "rotate-90" : ""}`}
         >
-          ▸
+          <Icon name="arrow" size={12} className="text-[var(--mu-text-lo)]" />
         </span>
-        <span>思维链</span>
-        {streaming && !text ? <span className="mu-blink">思考中…</span> : null}
       </button>
       {open && text ? (
-        <pre className="max-h-40 overflow-auto whitespace-pre-wrap px-3 pb-2 text-xs leading-relaxed text-[var(--mu-text-mid)]">
+        <pre className="max-h-40 overflow-auto whitespace-pre-wrap px-3 pb-2.5 text-xs leading-relaxed text-[var(--mu-text-mid)]">
           {text}
         </pre>
+      ) : !open && text ? (
+        <p className="truncate px-3 pb-2 text-xs text-[var(--mu-text-lo)]">{text}</p>
       ) : null}
     </div>
   );
 }
 
-/** Tool echo card (工具回显). */
+/** Tool echo card (工具回显). A status chip + tool name + muted one-line summary
+ *  on the left, a color-coded result tag on the right, and collapsible detail. */
 export function ToolCard({ tool }: { tool: ToolUsed }): React.ReactNode {
   const [open, setOpen] = useState(false);
   const status = tool.ok === undefined ? "neutral" : tool.ok ? "ok" : "err";
@@ -50,25 +65,26 @@ export function ToolCard({ tool }: { tool: ToolUsed }): React.ReactNode {
     <div className="mb-2 overflow-hidden rounded-[var(--mu-radius-sm)] border border-[var(--mu-glass-border)] bg-[var(--mu-surface-2)]/60">
       <button
         onClick={() => setOpen((v) => !v)}
-        className="flex w-full items-center gap-2 px-3 py-1.5 text-xs"
+        className="flex w-full items-center gap-2.5 px-3 py-2 text-xs transition-colors duration-200 hover:bg-[var(--mu-surface-4)]/40"
       >
         <span
-          className={`inline-block transition-transform duration-200 ${open ? "rotate-90" : ""}`}
+          className={`inline-flex h-5 w-5 shrink-0 items-center justify-center rounded-[var(--mu-radius-xs)] ${statusBadge(status)}`}
         >
-          ▸
+          <Icon name={statusIcon(status)} size={12} className={status === "neutral" ? "animate-spin" : undefined} />
+        </span>
+        <span className="min-w-0 flex-1 text-left">
+          <span className="block truncate font-medium text-[var(--mu-text-mid)]">{tool.name}</span>
+          {tool.summary ? (
+            <span className="block truncate text-[var(--mu-text-lo)]">{tool.summary}</span>
+          ) : null}
+        </span>
+        <Tag tone={status} className="shrink-0">{statusLabel(status)}</Tag>
+        <span className={`shrink-0 transition-transform duration-200 ease-[var(--mu-spring)] ${open ? "rotate-90" : ""}`}>
+          <Icon name="arrow" size={12} className="text-[var(--mu-text-lo)]" />
         </span>
-        <Tag tone={status}>
-          <span className="inline-flex items-center gap-1">
-            <Icon name={tool.ok === false ? "close" : tool.ok === true ? "check" : "gear"} size={14} />
-            {tool.name}
-          </span>
-        </Tag>
-        {tool.summary ? (
-          <span className="truncate text-[var(--mu-text-lo)]">{tool.summary}</span>
-        ) : null}
       </button>
       {(open || tool.detail) && tool.detail ? (
-        <pre className="max-h-40 overflow-auto whitespace-pre-wrap px-3 pb-2 text-xs text-[var(--mu-text-mid)]">
+        <pre className="max-h-40 overflow-auto whitespace-pre-wrap px-3 pb-2.5 text-xs text-[var(--mu-text-mid)]">
           {tool.detail}
         </pre>
       ) : null}
@@ -76,6 +92,30 @@ export function ToolCard({ tool }: { tool: ToolUsed }): React.ReactNode {
   );
 }
 
+type ToolStatus = "ok" | "err" | "neutral";
+
+function statusBadge(status: ToolStatus): string {
+  switch (status) {
+    case "ok": return "bg-[var(--mu-ok)]/15 text-[var(--mu-ok)]";
+    case "err": return "bg-[var(--mu-err)]/15 text-[var(--mu-err)]";
+    default: return "bg-[var(--mu-surface-4)] text-[var(--mu-text-mid)]";
+  }
+}
+function statusIcon(status: ToolStatus): IconName {
+  switch (status) {
+    case "ok": return "check";
+    case "err": return "close";
+    default: return "refresh";
+  }
+}
+function statusLabel(status: ToolStatus): string {
+  switch (status) {
+    case "ok": return "成功";
+    case "err": return "失败";
+    default: return "运行中";
+  }
+}
+
 /** A single message bubble. Per design/07 §1 the bubble shape is driven by the
  *  message's own `mode`: the same role renders differently under different modes,
  *  and a single session may mix shapes. Falls back to `chat` when mode is absent
@@ -108,11 +148,14 @@ function splitParagraphs(content: string): string[] {
  *  with `<action>`/`<narration>` rendered as muted italic via renderContent. */
 function ChatBody({ text, streaming }: { text: string; streaming?: boolean }): React.ReactNode {
   return (
-    <div className="rounded-[var(--mu-radius-lg)] border border-[var(--mu-glass-border)] bg-[var(--mu-surface-3)] px-4 py-2.5 text-sm text-[var(--mu-text-hi)]">
+    <div className="rounded-[var(--mu-radius-lg)] border border-[var(--mu-glass-border)] bg-[var(--mu-surface-3)] px-4 py-2.5 text-sm text-[var(--mu-text-hi)] shadow-[var(--mu-shadow-1)]">
       {text ? (
         <span className="whitespace-pre-wrap">{renderContent(text)}</span>
       ) : streaming ? (
-        <span className="mu-blink text-[var(--mu-text-lo)]">生成中…</span>
+        <span className="inline-flex items-center gap-1.5 text-[var(--mu-text-lo)]">
+          <Icon name="refresh" size={12} className="animate-spin" />
+          生成中…
+        </span>
       ) : null}
     </div>
   );
@@ -136,7 +179,7 @@ function AssistantParaBubble({
   return (
     <div className="mu-rise-in flex gap-3">
       {full ? (
-        <img src={personaAvatar(currentPersona)} alt="" className="mt-1 h-7 w-7 shrink-0 rounded-full object-cover" />
+        <img src={personaAvatar(currentPersona)} alt="" className="mt-1 h-7 w-7 shrink-0 rounded-full object-cover ring-1 ring-[var(--mu-glass-border)]" />
       ) : (
         <div className="w-7 shrink-0" aria-hidden />
       )}
@@ -207,8 +250,10 @@ export function SplitChatBubble({
     return <MessageBubble message={bubble} active={active} />;
   }
 
+  // Group the paragraphs of one reply into a tighter column so intra-reply
+  // segments read as one bubble while separate replies keep the 16px list gap.
   return (
-    <>
+    <div className="flex flex-col gap-2.5">
       {segments.map((seg, i) =>
         message.role === "user" ? (
           <UserParaBubble key={i} message={message} text={seg} full={i === 0} />
@@ -222,7 +267,7 @@ export function SplitChatBubble({
           />
         ),
       )}
-    </>
+    </div>
   );
 }
 
@@ -265,7 +310,7 @@ function AssistantBubble({
   const currentPersona = useAppStore((s) => s.currentPersona);
   return (
     <div className="mu-rise-in flex gap-3">
-      <img src={personaAvatar(currentPersona)} alt="" className="mt-1 h-7 w-7 shrink-0 rounded-full object-cover" />
+      <img src={personaAvatar(currentPersona)} alt="" className="mt-1 h-7 w-7 shrink-0 rounded-full object-cover ring-1 ring-[var(--mu-glass-border)]" />
       <div className="min-w-0 max-w-[85%]">
         <ModeTag mode={mode} />
         {message.mood ? (

frontend/web/src/lib/persona.ts

@@ -8,3 +8,16 @@ const DEFAULT_AVATAR = "/images/User_Avatar/Default_Avatar.png";
 export function personaAvatar(p: PersonaRecord | null | undefined): string {
   return p?.avatar || DEFAULT_AVATAR;
 }
+
+/** Orientation for a persona's chat wallpaper. */
+export type Orientation = "landscape" | "portrait";
+
+/** Resolve the persona's own chat wallpaper for the given orientation. Returns
+ *  undefined when the persona has none (or is null) so callers keep the plain
+ *  Miuix surface. Never another role's image. */
+export function personaChatBackground(
+  p: PersonaRecord | null | undefined,
+  orientation: Orientation
+): string | undefined {
+  return p?.chatBackground?.[orientation];
+}

frontend/web/src/modes/ChatShell.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useRef } from "react";
+import { useEffect, useMemo, useRef, useState } from "react";
 import { useAppStore } from "../store/useAppStore";
 import { useModeStore } from "../store/useModeStore";
 import { useSendChat } from "../lib/useChat";
@@ -8,6 +8,7 @@ import { ChatInput } from "../components/ChatInput";
 import { EmptyState } from "../components/primitives";
 import { Icon } from "../components/Icon";
 import { SessionStatusHint } from "../components/status";
+import { personaChatBackground, type Orientation } from "../lib/persona";
 
 /**
  * The single shared page (design/07 §1). All behavior modes live in ONE message
@@ -17,9 +18,27 @@ import { SessionStatusHint } from "../components/status";
  */
 export function ChatShell(): React.ReactNode {
   const messages = useAppStore((s) => s.messages);
+  const currentPersona = useAppStore((s) => s.currentPersona);
   const { send, sending } = useSendChat();
   const bottomRef = useRef<HTMLDivElement>(null);
 
+  // Chat wallpaper follows the current orientation (landscape when wide, else
+  // portrait) and re-evaluates on window resize.
+  const [orientation, setOrientation] = useState<Orientation>(() =>
+    window.innerWidth > window.innerHeight ? "landscape" : "portrait"
+  );
+
+  useEffect(() => {
+    const onResize = () =>
+      setOrientation(window.innerWidth > window.innerHeight ? "landscape" : "portrait");
+    window.addEventListener("resize", onResize);
+    return () => window.removeEventListener("resize", onResize);
+  }, []);
+
+  // The persona's own wallpaper for the current orientation; undefined keeps the
+  // plain Miuix surface (never another role's image).
+  const chatBackground = personaChatBackground(currentPersona, orientation);
+
   // The latest assistant message is the one being streamed right now; only it
   // carries the live 唤醒路径 node sequence (WakePath), so the capacity state
   // reflects the current turn rather than a collapsed historical message.
@@ -36,29 +55,42 @@ export function ChatShell(): React.ReactNode {
 
   return (
     <div className="flex h-full flex-col">
-      <div className="flex-1 overflow-y-auto">
+      <div className="relative min-h-0 flex-1">
-        <div className="mx-auto flex max-w-2xl flex-col gap-4 p-4">
+        {chatBackground ? (
-          <SessionStatusHint />
+          <div className="absolute inset-0 overflow-hidden" aria-hidden>
-          {messages.length === 0 ? (
+            <img
-            <EmptyState
+              src={chatBackground}
-              icon={<Icon name="chat" size={24} />}
+              alt=""
-              title="开始与昔涟对话"
+              draggable={false}
-              hint="模式只改变消息框的呈现方式，会话上下文与记忆保持不变"
+              className="h-full w-full object-cover"
             />
-          ) : (
+            <div className="absolute inset-0 bg-[var(--mu-surface-2)]/40" />
-            messages.map((m) => (
+          </div>
-              <SplitChatBubble
+        ) : null}
-                key={m.id}
+        <div className="relative h-full overflow-y-auto">
-                message={m}
+          <div className="mx-auto flex max-w-2xl flex-col gap-4 p-4">
-                active={
+            <SessionStatusHint />
-                  m.id === lastAssistantId &&
+            {messages.length === 0 ? (
-                  m.role === "assistant" &&
+              <EmptyState
-                  (m.streaming ?? false)
+                icon={<Icon name="chat" size={24} />}
-                }
+                title="开始与昔涟对话"
+                hint="模式只改变消息框的呈现方式，会话上下文与记忆保持不变"
               />
-            ))
+            ) : (
-          )}
+              messages.map((m) => (
-          <div ref={bottomRef} />
+                <SplitChatBubble
+                  key={m.id}
+                  message={m}
+                  active={
+                    m.id === lastAssistantId &&
+                    m.role === "assistant" &&
+                    (m.streaming ?? false)
+                  }
+                />
+              ))
+            )}
+            <div ref={bottomRef} />
+          </div>
         </div>
       </div>
       <ChatInput