fix(service-integrations): resolve type errors and test failures

- Fix CreateAppInput nullable types for integration fields
- Add type casts in IntegrationWidget renderer dispatching
- Guard decryptAppIntegration against missing fields in test mocks

src/lib/components/widget/integration/IntegrationWidget.svelte

@@ -5,7 +5,15 @@
 	import ProgressRenderer from './ProgressRenderer.svelte';
 	import AlertBannerRenderer from './AlertBannerRenderer.svelte';
 	import ChartRenderer from './ChartRenderer.svelte';
-	import type { IntegrationData } from '$lib/server/integrations/types.js';
+	import type {
+		IntegrationData,
+		StatCardData,
+		GaugeData,
+		ListData,
+		ProgressData,
+		AlertBannerData,
+		ChartData
+	} from '$lib/server/integrations/types.js';
 
 	interface Props {
 		config: {
@@ -61,17 +69,17 @@
 	</div>
 {:else if integrationData}
 	{#if integrationData.renderer === 'stat-card'}
-		<StatCardRenderer data={integrationData.data} />
+		<StatCardRenderer data={integrationData.data as StatCardData} />
 	{:else if integrationData.renderer === 'gauge'}
-		<GaugeRenderer data={integrationData.data} />
+		<GaugeRenderer data={integrationData.data as GaugeData} />
 	{:else if integrationData.renderer === 'list'}
-		<ListRenderer data={integrationData.data} />
+		<ListRenderer data={integrationData.data as ListData} />
 	{:else if integrationData.renderer === 'progress'}
-		<ProgressRenderer data={integrationData.data} />
+		<ProgressRenderer data={integrationData.data as ProgressData} />
 	{:else if integrationData.renderer === 'alert-banner'}
-		<AlertBannerRenderer data={integrationData.data} />
+		<AlertBannerRenderer data={integrationData.data as AlertBannerData} />
 	{:else if integrationData.renderer === 'chart'}
-		<ChartRenderer data={integrationData.data} />
+		<ChartRenderer data={integrationData.data as ChartData} />
 	{:else}
 		<div class="p-4 text-sm text-muted-foreground">Unknown renderer: {integrationData.renderer}</div>
 	{/if}