refactor: use backend chat sessions

src/lib/chatStream.test.ts

@@ -103,11 +103,11 @@ describe("streamAgentChat", () => {
     });
   });
 
-  it("parses legacy tool_call arguments when params is empty", async () => {
+  it("parses tool_call arguments when params is empty", async () => {
     apiFetch.mockResolvedValue({
       ok: true,
       body: makeStream([
-        'event: tool_call\ndata: {"conversationId":"agent-1e75dd01-29e","tool":"locate_features","params":{},"arguments":"{\\"ids\\":[\\"142902\\"],\\"feature_type\\":\\"junction\\"}"}\n\n',
+        'event: tool_call\ndata: {"session_id":"agent-1e75dd01-29e","tool":"locate_features","params":{},"arguments":"{\\"ids\\":[\\"142902\\"],\\"feature_type\\":\\"junction\\"}"}\n\n',
         'event: done\ndata: {"session_id":"agent-1e75dd01-29e"}\n\n',
       ]),
     });

src/lib/chatStream.ts

@@ -163,7 +163,6 @@ export const streamAgentChat = async ({
       try {
         const parsed = JSON.parse(data) as {
           session_id?: string;
-          conversationId?: string;
           content?: string;
           message?: string;
           detail?: string;
@@ -223,7 +222,7 @@ export const streamAgentChat = async ({
         } else if (event === "tool_call") {
           onEvent({
             type: "tool_call",
-            sessionId: parsed.session_id ?? parsed.conversationId ?? "",
+            sessionId: parsed.session_id ?? "",
             tool: parsed.tool ?? "",
             params: resolveToolParams(parsed.params, parsed.arguments),
           });