fix: invalid tool call ID recovery and system-reminder tag centralization (#627)

Co-authored-by: Letta <noreply@letta.com>

src/cli/components/ConversationSelector.tsx

@@ -4,6 +4,7 @@ import type { Conversation } from "@letta-ai/letta-client/resources/conversation
 import { Box, Text, useInput } from "ink";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { getClient } from "../../agent/client";
+import { SYSTEM_REMINDER_OPEN } from "../../constants";
 import { useTerminalWidth } from "../hooks/useTerminalWidth";
 import { colors } from "./colors";
 import { MarkdownDisplay } from "./MarkdownDisplay";
@@ -85,7 +86,7 @@ function extractUserMessagePreview(message: Message): string | null {
       const part = content[i];
       if (part?.type === "text" && part.text) {
         // Skip system-reminder blocks
-        if (part.text.startsWith("<system-reminder>")) continue;
+        if (part.text.startsWith(SYSTEM_REMINDER_OPEN)) continue;
         textToShow = part.text;
         break;
       }