feat: complete hosted mod sync and launcher interface updates

Add pack sync markers, tagged mod updates, parallel progress, JWT downloads and retry recovery. Include pending onboarding, about scene, compatibility data pack and download fixes.

apps/app-frontend/src/composables/useHostedCreation.ts

@@ -0,0 +1,56 @@
+import { ref } from 'vue'
+import { invoke } from '@tauri-apps/api/core'
+import { hostedCreate, hostedSync } from '../helpers/hosted-packs.ts'
+
+const installing = ref(false)
+const installError = ref('')
+const createdInstance = ref<string>()
+const completed = ref(false)
+let generation = 0
+
+export function forgetHostedCreation(instanceId: string) {
+	if (createdInstance.value !== instanceId) return
+	generation++
+	createdInstance.value = undefined
+	completed.value = false
+	installError.value = ''
+}
+
+export function useHostedCreation() {
+	function acknowledge(instanceId: string) {
+		if (completed.value && createdInstance.value === instanceId) {
+			createdInstance.value = undefined
+			completed.value = false
+		}
+	}
+	async function install() {
+		if (installing.value) return
+		installing.value = true
+		installError.value = ''
+		const attempt = generation
+		try {
+			if (createdInstance.value) {
+				const instance = await invoke<unknown | null>('plugin:instance|instance_get', {
+					instanceId: createdInstance.value,
+				})
+				if (attempt !== generation) return
+				if (!instance) {
+					createdInstance.value = undefined
+					completed.value = false
+				}
+			}
+			if (completed.value) return createdInstance.value
+			createdInstance.value ??= await hostedCreate()
+			const instanceId = createdInstance.value
+			await hostedSync(instanceId)
+			if (attempt !== generation) return
+			completed.value = true
+			return instanceId
+		} catch (cause) {
+			if (attempt === generation) installError.value = String(cause)
+		} finally {
+			installing.value = false
+		}
+	}
+	return { installing, installError, createdInstance, completed, acknowledge, install }
+}