android: detekt's return limit, on two functions I wrote after it caught me once

`dev` went red on 1e2b42a and nobody was watching — the CI wait was killed with the
session, so the push was never confirmed. Checked on the way back in.

Both findings are ReturnCount: four exits against a limit of two. The same rule
caught continueChecklist earlier the same day, which is the annoying part — I had
the lesson and wrote two more guard-clause ladders anyway.

checkInBackground becomes a `when`, which it wanted to be regardless: it is four
mutually exclusive situations and one action, and the ladder made that read like a
sequence of unrelated escapes.

onWifi folds its three null checks into one nullable chain. Same behaviour, and the
`caps != null &&` reads as what it is — an uncertain answer being treated as no.

android/app/src/main/java/com/fabledsword/thoughtsync/AppUpdate.kt

@@ -79,10 +79,12 @@ object AppUpdate {
      * Every uncertain answer is `false`: the cautious one costs nothing.
      */
     fun onWifi(context: Context): Boolean {
-        val manager = context.getSystemService(ConnectivityManager::class.java) ?: return false
+        val caps =
-        val active = manager.activeNetwork ?: return false
+            context
-        val caps = manager.getNetworkCapabilities(active) ?: return false
+                .getSystemService(ConnectivityManager::class.java)
-        return caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) &&
+                ?.let { manager -> manager.activeNetwork?.let(manager::getNetworkCapabilities) }
+        return caps != null &&
+            caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) &&
             caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED)
     }
 

android/app/src/main/java/com/fabledsword/thoughtsync/ui/UpdateViewModel.kt

@@ -88,30 +88,31 @@ class UpdateViewModel(
      * when one ran recently: flicking between two apps is not a request to re-check.
      */
     fun checkInBackground() {
-        if (state.busy) return
-
-        // Already fetched and waved away — say so again. "Later" is for that sitting,
-        // not forever, and without this the early return below would mean a single
-        // dismissal silenced the update permanently. Which is precisely the "lost"
-        // this whole path exists to prevent.
-        if (state.ready) {
-            if (state.nagDismissed) state = state.copy(nagDismissed = false)
-            return
-        }
-
-        // Already found one and never fetched it — almost always because the last look
-        // happened on mobile data. Retry the FETCH rather than the check, and ignore
-        // the interval: this is what makes an update found on the train arrive when
-        // the person gets home, instead of waiting out six hours first.
-        if (state.available != null) {
-            if (AppUpdate.onWifi(context)) viewModelScope.launch { download() }
-            return
-        }
-
         val now = System.currentTimeMillis()
-        if (now - lastCheckAt < CHECK_INTERVAL_MS) return
+        when {
-        lastCheckAt = now
+            state.busy -> Unit
-        runCheck(fetch = true)
+
+            // Already fetched and waved away — say so again. "Later" is for that
+            // sitting, not forever, and without this branch a single dismissal would
+            // silence the update permanently. Which is precisely the "lost" this whole
+            // path exists to prevent.
+            state.ready -> if (state.nagDismissed) state = state.copy(nagDismissed = false)
+
+            // Found one and never fetched it — almost always because the last look
+            // happened on mobile data. Retry the FETCH rather than the check, and
+            // ignore the interval: this is what makes an update found on the train
+            // arrive when the person gets home instead of waiting out six hours.
+            state.available != null ->
+                if (AppUpdate.onWifi(context)) viewModelScope.launch { download() }
+
+            // Flicking between two apps is not a request to re-check.
+            now - lastCheckAt < CHECK_INTERVAL_MS -> Unit
+
+            else -> {
+                lastCheckAt = now
+                runCheck(fetch = true)
+            }
+        }
     }
 
     private fun runCheck(fetch: Boolean) {