fix: rewrite repair-icons with proper error handling and progress

- Wrap all DB/file operations in try-catch, send error events via SSE
- Report skipped/progress events for items that already have icons
- Add 'started' event with total count so the UI shows real-time progress
- Catch route-level errors and stream them instead of returning JSON
- Use log line content as React key instead of array index

src/app/api/admin/import/furni/repair-icons/route.ts

@@ -2,6 +2,10 @@ import { withAdmin } from "@/lib/api-handler";
 import { PERMS } from "@/lib/permissions";
 import { repairMissingIcons } from "@/lib/services/repair-icons";
 
+function sseEvent(data: unknown): string {
+	return `data: ${JSON.stringify(data)}\n\n`;
+}
+
 export const POST = withAdmin({ permission: PERMS.ASSETS_IMPORT }, async () => {
 	const encoder = new TextEncoder();
 
@@ -9,17 +13,26 @@ export const POST = withAdmin({ permission: PERMS.ASSETS_IMPORT }, async () => {
 		async start(controller) {
 			const send = (data: unknown) => {
 				try {
-					controller.enqueue(
+					controller.enqueue(encoder.encode(sseEvent(data)));
-						encoder.encode(`data: ${JSON.stringify(data)}\n\n`),
-					);
 				} catch {
 					/* stream closed */
 				}
 			};
 
-			await repairMissingIcons(send);
+			try {
+				await repairMissingIcons(send);
+			} catch (err) {
+				send({
+					type: "error",
+					message: `repairMissingIcons threw: ${(err as Error).message}`,
+				});
+			}
 
-			controller.close();
+			try {
+				controller.close();
+			} catch {
+				/* ignore */
+			}
 		},
 	});