Fix custom chess-clock timer detection and save settings blocker

- Extract getInitialDraftSpeed() helper so both useState init and
  resetSettingsFormState use the same logic; unrecognized presets
  now produce a "custom:{bank}:{incr}" string instead of falling
  back to "standard", so the custom section auto-expands correctly
  (e.g. 8 hr bank + 30 min increment is no longer shown as Standard)
- resetSettingsFormState was not resetting draftSpeed at all; fixed
- Clear hasUnsavedSettingsChanges in the Form's onSubmit so the
  useBlocker check is false at the moment the save navigation starts,
  preventing the "Leave without saving?" dialog from firing on save
- Replace the cleared-on-success useEffect with one that re-marks
  dirty when the action returns an error, so the warning reappears
  after a failed save

https://claude.ai/code/session_01DgHNkvJXGizx41CE2tkVS1

app/routes/leagues/$leagueId.settings.tsx

@@ -48,6 +48,19 @@ type LoaderSportsSeason = Route.ComponentProps["loaderData"]["allSportsSeasons"]
   fantasySeasonId?: string | null;
 };
 
+function getInitialDraftSpeed(season: LoaderSeason): string {
+  const mode = season?.draftTimerMode ?? "chess_clock";
+  if (mode === "standard") return season?.draftIncrementTime?.toString() ?? "90";
+  if (season?.draftInitialTime === 60 && season?.draftIncrementTime === 10) return "fast";
+  if (season?.draftInitialTime === 120 && season?.draftIncrementTime === 15) return "standard";
+  if (season?.draftInitialTime === 28800 && season?.draftIncrementTime === 3600) return "slow";
+  if (season?.draftInitialTime === 43200 && season?.draftIncrementTime === 3600) return "very-slow";
+  if (season?.draftInitialTime != null && season?.draftIncrementTime != null) {
+    return `custom:${season.draftInitialTime}:${season.draftIncrementTime}`;
+  }
+  return "standard";
+}
+
 function getInitialScoringPreset(season: LoaderSeason) {
   const rules: ScoringRules = {
     pointsFor1st: season?.pointsFor1st ?? DEFAULT_SCORING_RULES.pointsFor1st,
@@ -148,15 +161,7 @@ export default function LeagueSettings({ loaderData, actionData }: Route.Compone
     pointsFor7th: season?.pointsFor7th ?? DEFAULT_SCORING_RULES.pointsFor7th,
     pointsFor8th: season?.pointsFor8th ?? DEFAULT_SCORING_RULES.pointsFor8th,
   });
-  const initTimerMode = season?.draftTimerMode ?? "chess_clock";
+  const [draftSpeed, setDraftSpeed] = useState(() => getInitialDraftSpeed(season));
-  const [draftSpeed, setDraftSpeed] = useState(() => {
-    if (initTimerMode === "standard") return season?.draftIncrementTime?.toString() ?? "90";
-    if (season?.draftInitialTime === 60 && season?.draftIncrementTime === 10) return "fast";
-    if (season?.draftInitialTime === 120 && season?.draftIncrementTime === 15) return "standard";
-    if (season?.draftInitialTime === 28800 && season?.draftIncrementTime === 3600) return "slow";
-    if (season?.draftInitialTime === 43200 && season?.draftIncrementTime === 3600) return "very-slow";
-    return "standard";
-  });
   const [selectedSports, setSelectedSports] = useState<Set<string>>(
     () => getInitialSelectedSports({ season, allSportsSeasons })
   );
@@ -184,13 +189,13 @@ export default function LeagueSettings({ loaderData, actionData }: Route.Compone
     setHasDraftOrderChanges(false);
   }, [draftSlots, teams]);
 
-  // Clear settings dirty flag after a successful (non-error) submission
+  // Re-mark dirty if the save returned an error (success path redirects away, so no cleanup needed there)
   useEffect(() => {
-    if (!hasUnsavedSettingsChanges || navigation.state !== "idle") return;
+    if (navigation.state !== "idle") return;
-    if (actionData && !("error" in actionData)) {
+    if (actionData && "error" in actionData) {
-      setHasUnsavedSettingsChanges(false);
+      setHasUnsavedSettingsChanges(true);
     }
-  }, [actionData, hasUnsavedSettingsChanges, navigation.state]);
+  }, [actionData, navigation.state]);
 
   const canEditSports = season?.status === "pre_draft";
   const canEditTeamCount = season?.status === "pre_draft";
@@ -235,6 +240,7 @@ export default function LeagueSettings({ loaderData, actionData }: Route.Compone
     setDiscordWebhookUrl(league.discordWebhookUrl ?? "");
     setTeamCountValue(teamCount);
     setTimerMode(season?.draftTimerMode ?? "chess_clock");
+    setDraftSpeed(getInitialDraftSpeed(season));
     setOvernightMode(season?.overnightPauseMode ?? "none");
     setOvernightStart(season?.overnightPauseStart ?? "23:00");
     setOvernightEnd(season?.overnightPauseEnd ?? "07:00");
@@ -345,7 +351,7 @@ export default function LeagueSettings({ loaderData, actionData }: Route.Compone
 
         <main className="space-y-6">
           {showUpdateForm && (
-            <Form method="post" noValidate className="space-y-6">
+            <Form method="post" noValidate className="space-y-6" onSubmit={() => setHasUnsavedSettingsChanges(false)}>
               <input type="hidden" name="intent" value="update" />
 
               <LeagueBasicsSection