Integrate backend APIs and move review to center editor tab

src/core/IndexingClientApi.js

@@ -0,0 +1,46 @@
+import { ApiHttpClient } from "./ApiHttpClient.js";
+
+export class IndexingClientApi {
+  constructor(http = new ApiHttpClient(), pollMs = 700, timeoutMs = 120000) {
+    this.http = http;
+    this.pollMs = pollMs;
+    this.timeoutMs = timeoutMs;
+  }
+
+  async submitSnapshot(projectId, files) {
+    const queued = await this.http.request("/api/rag/sessions", {
+      method: "POST",
+      body: JSON.stringify({ project_id: projectId, files })
+    });
+    const status = await this.#pollRagJob(queued.rag_session_id, queued.index_job_id);
+    return { ...status, rag_session_id: queued.rag_session_id };
+  }
+
+  async submitChanges(ragSessionId, changedFiles) {
+    const queued = await this.http.request(`/api/rag/sessions/${encodeURIComponent(ragSessionId)}/changes`, {
+      method: "POST",
+      body: JSON.stringify({ changed_files: changedFiles })
+    });
+    const status = await this.#pollRagJob(ragSessionId, queued.index_job_id);
+    return { ...status, rag_session_id: ragSessionId };
+  }
+
+  async #pollRagJob(ragSessionId, jobId) {
+    const started = Date.now();
+    while (Date.now() - started < this.timeoutMs) {
+      const status = await this.http.request(
+        `/api/rag/sessions/${encodeURIComponent(ragSessionId)}/jobs/${encodeURIComponent(jobId)}`
+      );
+      if (status.status === "done") return status;
+      if (status.status === "error") {
+        throw new Error(status.error?.desc || "Indexing failed");
+      }
+      await this.#sleep(this.pollMs);
+    }
+    throw new Error("Index polling timeout");
+  }
+
+  #sleep(ms) {
+    return new Promise((resolve) => setTimeout(resolve, ms));
+  }
+}