feat(settings): set how hard the Coach thinks, cap it as an operator, edit its memory

Thinking depth (Off, Low, Medium, High) sits under the model in the
Coach's quick settings and in Settings → Coach. It renders the resolved
block from the account payload: levels above the operator's cap are
disabled and say so, the field locks with one sentence when the
operator switched reasoning off, and Off reads Minimal where the
provider cannot stop thinking. The provider's own reasoning select
leaves the quick settings and says the Coach has its own.

The operator gets a switch to allow deeper thinking and a select for
the highest depth. The memory list shows where each entry came from,
lets it be edited in place, and is linked from the quick settings with
its count. The deep-linked data section no longer draws a ring.

src/components/settings/ai/reasoning-effort-field.tsx

@@ -4,6 +4,8 @@
  * Reasoning select (#1126) for the Local and OpenAI-compatible forms.
  * Same Label + NativeSelect + hint layout as the model field above it.
  * The empty value is Default: nothing is sent and the model decides.
+ * v1.41 — the Coach reads its own thinking depth from the Coach settings;
+ * a line under the hint says so.
  * ──────────────────────────────────────────────────────────────── */
 
 import { Label } from "@/components/ui/label";
@@ -56,6 +58,14 @@ export function ReasoningEffortField({
       <p id={`${id}-hint`} className="text-muted-foreground mt-1 text-xs">
         {t("settings.ai.reasoning.hint")}
       </p>
+      {/* v1.41 — the Coach has its own thinking depth; this select is the
+          default for everything else the provider does. */}
+      <p
+        data-slot="reasoning-effort-coach-note"
+        className="text-muted-foreground mt-1 text-xs"
+      >
+        {t("settings.ai.reasoning.coachNote")}
+      </p>
     </div>
   );
 }