Clean up Claude agent SDK message conversion

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/server/src/server/agent/providers/claude-agent.ts

@@ -29,7 +29,6 @@ import type {
   AgentPermissionResponse,
   AgentPermissionUpdate,
   AgentPersistenceHandle,
-  AgentPromptContentBlock,
   AgentPromptInput,
   AgentRunOptions,
   AgentRunResult,
@@ -788,26 +787,25 @@ class ClaudeAgentSession implements AgentSession {
   }
 
   private toSdkUserMessage(prompt: AgentPromptInput): SDKUserMessage {
-    const content = Array.isArray(prompt)
+    const content: Array<{ type: "text"; text: string } | { type: "image"; source: { type: "base64"; media_type: string; data: string } }> = [];
-      ? prompt.flatMap((chunk: AgentPromptContentBlock) => {
+    if (Array.isArray(prompt)) {
+      for (const chunk of prompt) {
         if (chunk.type === "text") {
-            return [{ type: "text", text: chunk.text }];
+          content.push({ type: "text", text: chunk.text });
-          }
+        } else if (chunk.type === "image") {
-          if (chunk.type === "image") {
+          content.push({
-            return [
-              {
             type: "image",
             source: {
               type: "base64",
               media_type: chunk.mimeType,
               data: chunk.data,
             },
-              },
+          });
-            ];
+        }
+      }
+    } else {
+      content.push({ type: "text", text: prompt });
     }
-          return [];
-        })
-      : [{ type: "text", text: prompt }];
 
     return {
       type: "user",