Add Prettier and ESLint tooling (Refs #77)

src/lib/ui/stores/time-zone.ts

@@ -9,18 +9,31 @@ export const timeZonePersistenceError = writable(false);
 /** Called only on mount so server rendering never shares a user's preference. */
 export function startTimeZonePreference(): () => void {
     let saved: string | null = null;
-    try { saved = localStorage.getItem(TIME_ZONE_STORAGE_KEY); } catch { /* Use the default. */ }
+    try {
+        saved = localStorage.getItem(TIME_ZONE_STORAGE_KEY);
+    } catch {
+        /* Use the default. */
+    }
     timeZone.set(validTimeZone(saved) ? saved : DEFAULT_TIME_ZONE);
-    const unsubscribe = timeZone.subscribe(value => {
+    const unsubscribe = timeZone.subscribe((value) => {
         try {
             localStorage.setItem(TIME_ZONE_STORAGE_KEY, value);
             timeZonePersistenceError.set(false);
-        } catch { timeZonePersistenceError.set(true); }
+        } catch {
+            timeZonePersistenceError.set(true);
+        }
     });
     function onStorage(event: StorageEvent) {
-        if (event.storageArea !== localStorage || (event.key !== TIME_ZONE_STORAGE_KEY && event.key !== null)) return;
+        if (
+            event.storageArea !== localStorage ||
+            (event.key !== TIME_ZONE_STORAGE_KEY && event.key !== null)
+        )
+            return;
         timeZone.set(validTimeZone(event.newValue) ? event.newValue : DEFAULT_TIME_ZONE);
     }
     window.addEventListener('storage', onStorage);
-    return () => { unsubscribe(); window.removeEventListener('storage', onStorage); };
+    return () => {
+        unsubscribe();
+        window.removeEventListener('storage', onStorage);
+    };
 }