refactor: unify streaming

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

src/stores/servicesStore.ts

@@ -268,22 +268,29 @@ export const useServicesStore = defineStore('mailServicesStore', () => {
    * @param secret - optional secret for discovery
    * @param location - optional location for discovery
    * @param provider - optional provider identifier for discovery
+   * @param onService - called for each discovered service as it arrives
    * 
-   * @returns Promise with list of discovered service objects
+   * @returns Promise resolving to { total } when the stream completes
    */
   async function discover(
     identity: string,
     secret: string | undefined,
     location: string | undefined,
     provider: string | undefined,
-  ): Promise<ServiceObject[]> {
+    onService?: (service: ServiceObject) => void,
+  ): Promise<{ total: number }> {
     transceiving.value = true
     
     try {
-      const services = await serviceService.discover({identity, secret, location, provider})
+      const result = await serviceService.discover(
+        { identity, secret, location, provider },
+        (service: ServiceObject) => {
+          onService?.(service)
+        }
+      )
 
-      console.debug('[Mail Manager][Store] - Successfully discovered', services.length, 'services')
-      return services
+      console.debug('[Mail Manager][Store] - Successfully discovered', result.total, 'services')
+      return result
     } catch (error: any) {
       console.error('[Mail Manager][Store] - Failed to discover service:', error)
       throw error