fix(minimax): pass through custom model IDs with default info fallback

Previously, unknown model IDs were silently replaced with the default
model ID in both backend getModel() and ignored in the frontend
useSelectedModel hook (returning undefined info, causing context window
to display as 1).

Now custom/unknown model IDs are preserved for API calls while falling
back to the default model info for context window and pricing metadata.

src/api/providers/__tests__/minimax.spec.ts

@@ -196,6 +196,16 @@ describe("MiniMaxHandler", () => {
 			const model = handlerDefault.getModel()
 			expect(model.id).toBe("MiniMax-M2.7")
 		})
+
+		it("should pass through unknown model ID and fall back to default model info", () => {
+			const handlerCustom = new MiniMaxHandler({
+				minimaxApiKey: "test-minimax-api-key",
+				apiModelId: "some-future-minimax-model",
+			})
+			const model = handlerCustom.getModel()
+			expect(model.id).toBe("some-future-minimax-model")
+			expect(model.info).toEqual(minimaxModels[minimaxDefaultModelId])
+		})
 	})
 
 	describe("API Methods", () => {

src/api/providers/minimax.ts

@@ -271,8 +271,8 @@ export class MiniMaxHandler extends BaseProvider implements SingleCompletionHand
 
 	getModel() {
 		const modelId = this.options.apiModelId
-		const id = modelId && modelId in minimaxModels ? (modelId as MinimaxModelId) : minimaxDefaultModelId
-		const info = minimaxModels[id]
+		const id = modelId || minimaxDefaultModelId
+		const info = minimaxModels[id as MinimaxModelId] ?? minimaxModels[minimaxDefaultModelId]
 
 		const params = getModelParams({
 			format: "anthropic",

webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts

@@ -773,5 +773,19 @@ describe("useSelectedModel", () => {
 			expect(result.current.id).toBe("MiniMax-M2.7")
 			expect(result.current.info).toEqual(minimaxModels["MiniMax-M2.7"])
 		})
+
+		it("should fall back to default model info for unknown model IDs", () => {
+			const apiConfiguration: ProviderSettings = {
+				apiProvider: "minimax",
+				apiModelId: "some-future-minimax-model",
+			}
+
+			const wrapper = createWrapper()
+			const { result } = renderHook(() => useSelectedModel(apiConfiguration), { wrapper })
+
+			expect(result.current.provider).toBe("minimax")
+			expect(result.current.id).toBe("some-future-minimax-model")
+			expect(result.current.info).toEqual(minimaxModels[minimaxDefaultModelId])
+		})
 	})
 })

webview-ui/src/components/ui/hooks/useSelectedModel.ts

@@ -243,7 +243,9 @@ function getSelectedModel({
 		}
 		case "minimax": {
 			const id = apiConfiguration.apiModelId ?? defaultModelId
-			const info = minimaxModels[id as keyof typeof minimaxModels]
+			const info =
+				minimaxModels[id as keyof typeof minimaxModels] ??
+				minimaxModels[defaultModelId as keyof typeof minimaxModels]
 			return { id, info }
 		}
 		case "zai": {