feat: add multi-tab support to remote browser

frontend/src/api/index.ts

@@ -397,11 +397,21 @@ export const customPagesApi = {
 }
 
 // ——— Remote browser sessions ———
+export interface BrowserTabData {
+  id: string
+  title: string
+  url: string
+  created_at: number
+}
+
 export interface BrowserSessionData {
   id: string
   custom_page_id: number
   url: string
   title: string
+  active_tab_id?: string
+  tabs?: BrowserTabData[]
+  tab_revision?: number
 }
 
 export type BrowserEventPayload =
@@ -418,6 +428,10 @@ export const browserSessionsApi = {
   get: (id: string) => api.get<BrowserSessionData>(`/api/browser-sessions/${id}`),
   event: (id: string, data: BrowserEventPayload) =>
     api.post<BrowserSessionData>(`/api/browser-sessions/${id}/events`, data),
+  activateTab: (id: string, tabId: string) =>
+    api.post<BrowserSessionData>(`/api/browser-sessions/${id}/tabs/${tabId}/activate`),
+  closeTab: (id: string, tabId: string) =>
+    api.delete<BrowserSessionData>(`/api/browser-sessions/${id}/tabs/${tabId}`),
   selection: (id: string) => api.get<{ text: string }>(`/api/browser-sessions/${id}/selection`),
   clipboard: (id: string) => api.get<{ text?: string; error?: string }>(`/api/browser-sessions/${id}/clipboard`),
   close: (id: string) => api.delete(`/api/browser-sessions/${id}`),