fix(model-picker): 模型选择 - 修复候选报价显示与同渠道模型跳回 (#556)

Original-Commit: 7a5e17e2112c3c23e081a1ecf3c33a654cf1e907
fix(model-picker): 模型选择 - 修复候选报价显示与同渠道模型跳回

web/test/model-picker-groups.test.ts

@@ -1,11 +1,13 @@
 import { expect, test } from "bun:test";
 import { groupModelsForPicker, modelChannelLabel } from "../src/lib/model-picker-groups";
-import { modelCompatibilityError, resolveCompatibleModel } from "../src/lib/model-selection";
+import { groupModelsByDisplayName, modelCompatibilityError, modelGroupReferenceLimits, resolveCompatibleModel } from "../src/lib/model-selection";
 import { modelQuoteRequest, priceTiersForCurrentSelection, priceTierSummaryLabel } from "../src/lib/model-pricing";
 import { systemChannelModelChannels } from "../src/lib/user-session";
 import type { PublicChannelCatalog, PublicChannelModel } from "../src/services/api/logical-models";
 import { defaultConfig, normalizeConfigSnapshot, resolveModelRequestConfig, selectableModelsByCapability } from "../src/stores/use-config-store";
 import { defaultModelCapabilityConfig } from "../src/lib/model-capabilities";
+import { buildGenerationConfig } from "../src/lib/canvas/canvas-project-generation";
+import { CanvasNodeType } from "../src/types/canvas";
 
 function model(label = "", price = 300000, modelKey = "seedance-2.0", displayName = modelKey === "seedance-2.0" ? "Seedance 2.0" : modelKey): PublicChannelModel {
     return {
@@ -62,6 +64,42 @@ test("selection and quote keep the chosen channel even when another channel is c
     expect(resolveModelRequestConfig(config, value)).toMatchObject({ channelId: "b", model: "seedance-2.0" });
 });
 
+function sameChannelVariants() {
+    const channels = systemChannelModelChannels([{ id: "comfy", name: "Comfy", displayName: "Comfy", models: [
+        model("高速版", 100_000, "h3-fast", "MiniMax H3"),
+        model("多图一致性", 200_000, "h3-multi", "MiniMax H3"),
+    ] }]);
+    return normalizeConfigSnapshot({ config: { ...defaultConfig, channels, model: "comfy::h3-multi", videoModel: "comfy::h3-multi" } }).config;
+}
+
+test("same-channel system variants retain explicit model identity through selection, generation and quote", () => {
+    const config = sameChannelVariants();
+    const options = selectableModelsByCapability(config, "video");
+    expect(groupModelsForPicker(config, options)[0].models).toHaveLength(2);
+    expect(groupModelsByDisplayName(config, options).map((group) => group.models)).toEqual(options.map((value) => [value]));
+    for (const value of options) {
+        expect(resolveCompatibleModel(config, value, { capability: "video" })).toBe(value);
+        const generation = buildGenerationConfig(config, {
+            id: "video", type: CanvasNodeType.Video, title: "Video", position: { x: 0, y: 0 }, width: 100, height: 100,
+            metadata: { model: value, generationMode: "video" },
+        }, "video");
+        expect(generation.model).toBe(value);
+        expect(resolveModelRequestConfig(generation, generation.model)).toMatchObject({ channelId: "comfy", model: value.split("::")[1] });
+        expect(modelQuoteRequest(config, value, "video")).toMatchObject({ channelId: "comfy", modelKey: value.split("::")[1] });
+    }
+});
+
+test("same-channel system variants do not borrow capabilities or reroute incompatible selections", () => {
+    const config = sameChannelVariants();
+    config.channels[0].modelCosts![0].capabilityConfig!.video!.references.maxImages = 0;
+    config.channels[0].modelCosts![1].capabilityConfig!.video!.references.maxImages = 2;
+    const requirements = { capability: "video" as const, input: { textCount: 1, imageCount: 1, videoCount: 0, audioCount: 0, characterCount: 0 } };
+    expect(modelGroupReferenceLimits(config, "comfy::h3-fast", "video")?.maxImages).toBe(0);
+    expect(modelCompatibilityError(config, "comfy::h3-fast", requirements)).not.toBe("");
+    expect(resolveCompatibleModel(config, "comfy::h3-fast", requirements)).toBe("");
+    expect(resolveCompatibleModel(config, "comfy::h3-multi", requirements)).toBe("comfy::h3-multi");
+});
+
 test("different display names in one channel create distinct first-level groups", () => {
     const config = fixture();
     const extra = systemChannelModelChannels([{ id: "volc", name: "火山引擎", displayName: "火山引擎", models: [