重构聊天会话管理，支持会话历史和存储

src/components/chat/AgentComposer.tsx

@@ -25,6 +25,7 @@ import AttachFileRounded from "@mui/icons-material/AttachFileRounded";
 type AgentComposerProps = {
   input: string;
   inputRef: React.RefObject<HTMLInputElement | null>;
+  isHydrating?: boolean;
   isStreaming: boolean;
   isListening: boolean;
   isSttSupported: boolean;
@@ -40,6 +41,7 @@ type AgentComposerProps = {
 export const AgentComposer = ({
   input,
   inputRef,
+  isHydrating = false,
   isStreaming,
   isListening,
   isSttSupported,
@@ -52,7 +54,7 @@ export const AgentComposer = ({
   onPresetSelect,
 }: AgentComposerProps) => {
   const theme = useTheme();
-  const canSend = input.trim().length > 0 && !isStreaming;
+  const canSend = input.trim().length > 0 && !isStreaming && !isHydrating;
   const [isPresetOpen, setIsPresetOpen] = React.useState(false);
 
   return (
@@ -160,11 +162,12 @@ export const AgentComposer = ({
                 onSend();
               }
             }}
-            placeholder="描述你的分析目标，或点击上方指令库..."
+            placeholder={isHydrating ? "正在加载对话记录..." : "描述你的分析目标，或点击上方指令库..."}
             fullWidth
             multiline
             maxRows={5}
             variant="standard"
+            disabled={isHydrating}
             InputProps={{
               disableUnderline: true,
               sx: { px: 1, py: 0.5, fontSize: "1rem", lineHeight: 1.6, fontWeight: 500, color: "text.primary" },
@@ -199,7 +202,7 @@ export const AgentComposer = ({
                 ) : (
                   <IconButton
                     onClick={onStartListening}
-                    disabled={isStreaming}
+                    disabled={isStreaming || isHydrating}
                     aria-label="语音输入"
                     size="small"
                     sx={{ color: "text.secondary", width: 36, height: 36, bgcolor: alpha("#fff", 0.6) }}
@@ -262,7 +265,7 @@ export const AgentComposer = ({
           style={{ width: 14, height: 14 }}
         />
         <Typography variant="caption" sx={{ fontSize: "0.65rem", color: "text.secondary", fontWeight: 500, letterSpacing: 0.5 }}>
-          Powered by DeepSeek V3 · TJWater Agent Intelligence
+          Powered by DeepSeek V4 · TJWater Agent Intelligence
         </Typography>
       </Box>
     </Box>