Update check: S-22 "Check for update" always asks the server (D-140)

UpdateRepository.checkNow() (default: check(), for throttle-free fakes) skips
the 6-hour throttle of the automatic check (AC-16.2) and restarts its window;
AboutViewModel calls it. Debug builds still never check (AC-16.5).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

android/feature/settings/src/main/kotlin/se/hagstedt/kvitt/feature/settings/about/AboutViewModel.kt

@@ -38,7 +38,8 @@ class AboutViewModel @Inject constructor(
 
     /**
      * "Sök efter uppdatering" (online, FR-16): progress in the button; then the banner (Available), "Du har den
-     * senaste versionen" (UpToDate, AC-16.6) or "Kunde inte nå servern" (Failed).
+     * senaste versionen" (UpToDate, AC-16.6) or "Kunde inte nå servern" (Failed). Always asks the server, whatever the
+     * 6-hour throttle of the automatic check says (D-140).
      */
     fun check() {
         val s = state.value ?: return
@@ -49,7 +50,7 @@ class AboutViewModel @Inject constructor(
         }
         local.update { it.copy(checking = true, bannerHidden = false) }
         viewModelScope.launch {
-            val message = when (update.check()) {
+            val message = when (update.checkNow()) {
                 UpdateCheck.UpToDate -> UiMessage(R.string.settings_about_up_to_date)
                 UpdateCheck.Failed -> UiMessage(DesignR.string.common_could_not_reach_server)
                 is UpdateCheck.Available -> null