feat(web): drop "none" from the offered thinking levels (#34)

Co-authored-by: Alice <alice@prismshadow.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/web/src/features/agents/agent-settings-page.tsx

@@ -31,6 +31,7 @@ import { Modal } from "../../components/ui/modal";
 import { Skeleton } from "../../components/ui/skeleton";
 import { VaultTab } from "./vault-tab";
 import { SchedulesTab } from "./schedules-tab";
+import { thinkingLevelOptionsFor } from "../chat/thinking-level";
 
 type TabKey = "overview" | "prompt" | "runtime" | "tools" | "vault" | "schedules";
 
@@ -500,7 +501,16 @@ function RuntimeTab({ data, onSave }: { data: AgentConfigResponse; onSave: SaveF
   };
 
   // S is reassigned on language switch (live binding), so read it during render rather than hoisting to a module-level constant.
-  const thinkingLevelOptions = withDefaultOption(S.agent.thinkingLevelOptions);
+  // "none" is no longer offered (many models cannot disable thinking) but stays a valid stored
+  // value: assembly lives in thinkingLevelOptionsFor, gated on the **persisted** config — a
+  // misclick onto another tier keeps the legacy row until the change is actually saved, so the
+  // stored value stays reachable (see thinking-level.ts).
+  const thinkingLevelOptions = thinkingLevelOptionsFor(
+    S.agent.thinkingLevelOptions,
+    S.agent.defaultValue,
+    S.agent.thinkingLevelNoneKept,
+    cfg.model?.thinkingLevel,
+  );
   const compactionModeOptions = withDefaultOption(S.agent.compactionModeOptions);
 
   return (