fix(combos): show effective strategy vs global default; keep explicit fallback override

src/app/(dashboard)/dashboard/combos/page.js

@@ -51,6 +51,7 @@ export default function CombosPage() {
   const [editingCombo, setEditingCombo] = useState(null);
   const [activeProviders, setActiveProviders] = useState([]);
   const [comboStrategies, setComboStrategies] = useState({});
+  const [globalComboStrategy, setGlobalComboStrategy] = useState("fallback");
   const [capacityAdapter, setCapacityAdapter] = useState(EMPTY_CAPACITY_ADAPTER);
   const { getCaps } = useModelCaps();
   const [confirmState, setConfirmState] = useState(null);
@@ -77,6 +78,7 @@ export default function CombosPage() {
         setActiveProviders(providersData.connections || []);
       }
       setComboStrategies(settingsData.comboStrategies || {});
+      setGlobalComboStrategy(settingsData.comboStrategy || "fallback");
       const rawAdapter = settingsData.capacityAdapter || {};
       const normalized = {};
       for (const cap of CAPACITY_ADAPTER_CAPS) {
@@ -159,14 +161,19 @@ export default function CombosPage() {
     });
   };
 
-  // Merge a per-combo strategy patch into settings.comboStrategies. Passing an empty
-  // patch (strategy back to default "fallback") drops the entry entirely.
+  // Merge a per-combo strategy patch into settings.comboStrategies.
+  // A "fallback" entry is only pruned when the global strategy is also fallback;
+  // otherwise it's kept so the combo explicitly overrides global round-robin/fusion.
   const handleSetComboStrategy = async (comboName, patch) => {
     try {
       const updated = { ...comboStrategies };
       const next = { ...(updated[comboName] || {}), ...patch };
-      // Prune to keep settings clean: default fallback with no extras = no entry.
-      if (!next.fallbackStrategy || next.fallbackStrategy === "fallback") {
+      // Prune to keep settings clean: default fallback with no extras = no entry,
+      // but only when it matches the global default (otherwise it's an override).
+      if (
+        (!next.fallbackStrategy || next.fallbackStrategy === "fallback") &&
+        (globalComboStrategy === "fallback" || !globalComboStrategy)
+      ) {
         delete updated[comboName];
       } else {
         updated[comboName] = next;
@@ -239,6 +246,7 @@ export default function CombosPage() {
               onEdit={() => setEditingCombo(combo)}
               onDelete={() => handleDelete(combo.id)}
               strategy={comboStrategies[combo.name] || {}}
+              globalStrategy={globalComboStrategy}
               onSetStrategy={(patch) => handleSetComboStrategy(combo.name, patch)}
             />
           ))}
@@ -294,9 +302,11 @@ const STRATEGY_OPTIONS = [
   { value: "fusion", label: "Fusion — panel + judge" },
 ];
 
-function ComboCard({ combo, getCaps, activeProviders = [], copied, onCopy, onEdit, onDelete, strategy = {}, onSetStrategy }) {
+function ComboCard({ combo, getCaps, activeProviders = [], copied, onCopy, onEdit, onDelete, strategy = {}, globalStrategy = "fallback", onSetStrategy }) {
   const [showJudgeSelect, setShowJudgeSelect] = useState(false);
-  const current = strategy.fallbackStrategy || "fallback";
+  // Show the effective strategy: per-combo override first, then the global
+  // default (combos without an entry fall through to settings.comboStrategy).
+  const current = strategy.fallbackStrategy || globalStrategy || "fallback";
   const judge = strategy.judgeModel || "";
   const isFusion = current === "fusion";
 

src/app/(dashboard)/dashboard/media-providers/combo/[id]/page.js

@@ -84,7 +84,9 @@ export default function ComboDetailPage() {
       setName(c.name);
       setProviders(c.models || []);
       const s = settingsRes.ok ? await settingsRes.json() : {};
-      setRoundRobin(s.comboStrategies?.[c.name]?.fallbackStrategy === "round-robin");
+      // Effective strategy: per-combo override first, then the global default.
+      const eff = s.comboStrategies?.[c.name]?.fallbackStrategy || s.comboStrategy || "fallback";
+      setRoundRobin(eff === "round-robin");
       const allLogs = logsRes.ok ? await logsRes.json() : [];
       setLogs(allLogs.filter((l) => typeof l === "string" && l.includes(c.name)).slice(0, 50));
     } catch { /* noop */ }
@@ -154,8 +156,14 @@ export default function ComboDetailPage() {
     const settingsRes = await fetch("/api/settings", { cache: "no-store" });
     const s = settingsRes.ok ? await settingsRes.json() : {};
     const updated = { ...(s.comboStrategies || {}) };
-    if (enabled) updated[combo.name] = { fallbackStrategy: "round-robin" };
-    else delete updated[combo.name];
+    if (enabled) {
+      updated[combo.name] = { fallbackStrategy: "round-robin" };
+    } else {
+      // Explicit fallback override so the combo stays ordered even when the
+      // global default is round-robin (a bare delete would inherit it).
+      if ((s.comboStrategy || "fallback") === "fallback") delete updated[combo.name];
+      else updated[combo.name] = { fallbackStrategy: "fallback" };
+    }
     await fetch("/api/settings", {
       method: "PATCH",
       headers: { "Content-Type": "application/json" },