feat: banner generation, improved memory system, streaming text animation

- Add banner/cover generation for stories with character reference support
- Improve summary system: generate every 8 msgs or when context large
- Enhance summary prompt to preserve critical story info (promises, relationships)
- Add typewriter text animation during AI streaming
- Increase context to 20 messages, lower summary temperature to 0.1
- Server: auto-truncate long messages instead of rejecting

server/index.js

@@ -198,18 +198,16 @@ function validateDeepSeekRequest(body) {
   const errors = [];
   const { messages, temperature, max_tokens } = body;
 
-  // Validate messages
+  // Validate messages - only check critical errors, truncation handled in sanitize
   if (!Array.isArray(messages)) {
     errors.push("messages must be an array");
   } else {
     if (messages.length === 0) {
       errors.push("messages cannot be empty");
     }
-    if (messages.length > DEEPSEEK_LIMITS.MAX_MESSAGES) {
-      errors.push(`too many messages (max ${DEEPSEEK_LIMITS.MAX_MESSAGES})`);
-    }
+    // Don't error on too many messages - we'll truncate them
+    // Don't error on too long messages - we'll truncate them
 
-    let totalLength = 0;
     for (let i = 0; i < messages.length; i++) {
       const msg = messages[i];
       if (!msg || typeof msg !== "object") {
@@ -223,21 +221,8 @@ function validateDeepSeekRequest(body) {
       }
       if (typeof msg.content !== "string") {
         errors.push(`messages[${i}].content must be a string`);
-      } else {
-        if (msg.content.length > DEEPSEEK_LIMITS.MAX_MESSAGE_LENGTH) {
-          errors.push(
-            `messages[${i}].content too long (max ${DEEPSEEK_LIMITS.MAX_MESSAGE_LENGTH} chars)`,
-          );
-        }
-        totalLength += msg.content.length;
       }
     }
-
-    if (totalLength > DEEPSEEK_LIMITS.MAX_TOTAL_LENGTH) {
-      errors.push(
-        `total message content too long (max ${DEEPSEEK_LIMITS.MAX_TOTAL_LENGTH} chars)`,
-      );
-    }
   }
 
   // Validate temperature
@@ -264,8 +249,37 @@ function validateDeepSeekRequest(body) {
   return errors;
 }
 
+/**
+ * Truncate ONLY individual messages that are too long.
+ * Does NOT remove messages - that would lose context.
+ * If total is too long, client should handle via summary generation.
+ */
+function truncateMessagesToFit(messages) {
+  const MAX_PER_MSG = DEEPSEEK_LIMITS.MAX_MESSAGE_LENGTH;
+
+  // Only truncate individual messages that are too long - keep the END (recent context)
+  return messages.map((msg, idx) => {
+    if (msg.content && msg.content.length > MAX_PER_MSG) {
+      console.log(
+        `Truncating message ${idx} (${msg.role}) from ${msg.content.length} to ${MAX_PER_MSG} chars - keeping END`,
+      );
+      // Keep end of message (most recent context is more important)
+      return {
+        ...msg,
+        content:
+          "[earlier content truncated]...\n\n" +
+          msg.content.slice(-MAX_PER_MSG + 50),
+      };
+    }
+    return msg;
+  });
+}
+
 function sanitizeDeepSeekMessages(messages) {
-  return messages.map((msg) => ({
+  // First truncate to fit limits
+  const truncatedMessages = truncateMessagesToFit(messages);
+
+  return truncatedMessages.map((msg) => ({
     role: msg.role,
     content: String(msg.content),
   }));
@@ -1059,7 +1073,7 @@ app.get("/api/admin/stats", requireAuth, async (req, res) => {
 // Прокси для генерации изображений через Grok (обход CORS)
 app.post("/api/generate-image", requireAuth, async (req, res) => {
   try {
-    const { prompt } = req.body;
+    const { prompt, orientation = "portrait", refHistory } = req.body;
     const apiKey = process.env.GEMINIGEN_API_KEY;
 
     if (!apiKey) {
@@ -1068,14 +1082,27 @@ app.post("/api/generate-image", requireAuth, async (req, res) => {
         .json({ error: "GeminiGen API key not configured" });
     }
 
-    console.log("Generating image with Grok, prompt:", prompt);
+    console.log(
+      "Generating image with Grok, prompt:",
+      prompt,
+      "orientation:",
+      orientation,
+      "refHistory:",
+      refHistory,
+    );
 
     // Используем FormData для multipart/form-data
     const formData = new FormData();
     formData.append("prompt", prompt);
-    formData.append("orientation", "portrait"); // 9:16
+    formData.append("orientation", orientation); // portrait (9:16) or landscape (16:9)
     formData.append("num_result", "1");
 
+    // Добавляем референс истории если есть (для консистентности персонажей)
+    if (refHistory) {
+      formData.append("ref_history", refHistory);
+      console.log("Using ref_history:", refHistory);
+    }
+
     const response = await fetch(
       "https://api.geminigen.ai/uapi/v1/imagen/grok",
       {