feat(coding): add renderer conversation store

src/lib/coding-conversations.ts

@@ -0,0 +1,55 @@
+import type {
+  ConversationSnapshot,
+  PromptAcceptance,
+  PromptMode,
+} from '@/types/coding-conversation';
+import {
+  createHostEventSource,
+  ensureHostApiToken,
+  hostApiFetch,
+} from './host-api';
+
+export interface SubmitCodingConversationPromptInput {
+  conversationId: string;
+  clientRequestId: string;
+  mode: PromptMode;
+  text: string;
+  attachments: Array<{ attachmentId: string }>;
+}
+
+export async function getCodingConversationSnapshot(
+  conversationId: string,
+): Promise<ConversationSnapshot> {
+  const response = await hostApiFetch<{ snapshot: ConversationSnapshot }>(
+    `/api/coding/conversations/${encodeURIComponent(conversationId)}/snapshot`,
+  );
+  return response.snapshot;
+}
+
+export async function submitCodingConversationPrompt(
+  input: SubmitCodingConversationPromptInput,
+): Promise<PromptAcceptance> {
+  const response = await hostApiFetch<{ acceptance: PromptAcceptance }>(
+    `/api/coding/conversations/${encodeURIComponent(input.conversationId)}/prompt`,
+    {
+      method: 'POST',
+      body: JSON.stringify({
+        clientRequestId: input.clientRequestId,
+        mode: input.mode,
+        text: input.text,
+        attachments: input.attachments,
+      }),
+    },
+  );
+  return response.acceptance;
+}
+
+export async function openCodingConversationEvents(
+  conversationId?: string,
+): Promise<EventSource> {
+  await ensureHostApiToken();
+  const params = new URLSearchParams();
+  if (conversationId) params.set('conversationId', conversationId);
+  const query = params.toString();
+  return createHostEventSource(`/api/coding/events${query ? `?${query}` : ''}`);
+}