diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad0b7b813..42ac40a70 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # CHANGELOG
 
+## v1.6.6
+
+- 画布云端写入改为可幂等重放的 operations 事务，支持字段级并发合并、冲突保护和删除后迟到更新拦截；完善预演场景保存、版本同步与 Agent 变更撤销。
+- Agent 视频审批可在确认前调整模型与生成规格；完善分镜校验、生成资源访问与任务结果恢复。
+- 优化大画布节点渲染预算和性能模式，统一工作区与管理后台侧栏体验。
+- 修复 PostgreSQL 连接池 keepalive 与闲置事务限制、短剧关闭时误隐藏角色库相关接口、灵感页刷新重定向和模型图片分辨率价格档识别。
+- 升级注意：数据库 schema 升至 v50，新增画布操作幂等回执表，启动时自动迁移。
+
 ## v1.6.5
 
 - Agent 重复读取同一结果或同一张图时改为软收敛：运行保持进行中，下一步暂时收起只读工具，仍可回复、提问或执行写操作。
diff --git a/VERSION b/VERSION
index ef0519020..0591f3366 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v1.6.5
+v1.6.6
diff --git a/backend/internal/app/channel_model_pricing_test.go b/backend/internal/app/channel_model_pricing_test.go
index aa5e61ee2..81058b5af 100644
--- a/backend/internal/app/channel_model_pricing_test.go
+++ b/backend/internal/app/channel_model_pricing_test.go
@@ -219,17 +219,7 @@ func TestRepriceTierFieldValidation(t *testing.T) {
 	}
 }
 
-func TestNormalizeChannelModelTierSelectorAcceptsResolutionTypo(t *testing.T) {
-	selector, resolution, videoSeconds, err := normalizeChannelModelTierSelector("image", ChannelModelPriceTierRequest{
-		Selector: map[string]string{"resoluton": "2K"},
-	})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if selector["resolution"] != "2k" || selector["resoluton"] != "" || resolution != "*" || videoSeconds != 0 {
-		t.Fatalf("selector=%v resolution=%q videoSeconds=%d", selector, resolution, videoSeconds)
-	}
-}
+func TestBatchRepricingRollsBackOnConcurrentChange(t *testing.T) {
 	for _, target := range []string{"model", "tier"} {
 		t.Run(target, func(t *testing.T) {
 			svc, db, _ := seedRepricingModels(t)
@@ -265,3 +255,15 @@ func TestNormalizeChannelModelTierSelectorAcceptsResolutionTypo(t *testing.T) {
 		})
 	}
 }
+
+func TestNormalizeChannelModelTierSelectorAcceptsResolutionTypo(t *testing.T) {
+	selector, resolution, videoSeconds, err := normalizeChannelModelTierSelector("image", ChannelModelPriceTierRequest{
+		Selector: map[string]string{"resoluton": "2K"},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if selector["resolution"] != "2k" || selector["resoluton"] != "" || resolution != "*" || videoSeconds != 0 {
+		t.Fatalf("selector=%v resolution=%q videoSeconds=%d", selector, resolution, videoSeconds)
+	}
+}
diff --git a/backend/internal/app/channel_presentation_test.go b/backend/internal/app/channel_presentation_test.go
index ca87d7587..7955a9340 100644
--- a/backend/internal/app/channel_presentation_test.go
+++ b/backend/internal/app/channel_presentation_test.go
@@ -49,7 +49,7 @@ func TestChannelPresentationUsesModelLabelsAndPublicOrder(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if len(catalog) != 2 || catalog[0].ID != "second" || catalog[0].Name != "渠道second" || catalog[0].DisplayName != "渠道second" {
+	if len(catalog) != 2 || catalog[0].ID != "second" || catalog[0].Name != "" || catalog[0].DisplayName != "" {
 		t.Fatalf("public catalog: %#v", catalog)
 	}
 	legacy, err := svc.PublicSystemChannels()
@@ -74,7 +74,7 @@ func TestChannelPresentationUsesModelLabelsAndPublicOrder(t *testing.T) {
 		t.Fatal(err)
 	}
 	catalog, err = svc.publicSystemChannelCatalog(nil)
-	if err != nil || catalog[0].Name != "渠道second" {
+	if err != nil || catalog[0].Name != "" || catalog[0].DisplayName != "" {
 		t.Fatalf("channel name: %v %v", catalog, err)
 	}
 	for _, invalid := range []int{-1, 1000000} {
diff --git a/backend/internal/app/model_catalog.go b/backend/internal/app/model_catalog.go
index e5466b27e..d4c2ef6ac 100644
--- a/backend/internal/app/model_catalog.go
+++ b/backend/internal/app/model_catalog.go
@@ -169,10 +169,12 @@ func (s *Service) publicSystemChannelCatalog(intent *ModelRequestIntent) ([]Publ
 		}
 
 		if len(publicModels) > 0 {
+			// 系统渠道的真实名称属于内部部署信息（供应商、中转站、内部命名等），
+			// 不得通过普通用户可访问的创作目录泄漏。前端只依赖 ID 做分组，名称留空后由客户端统一展示为“系统模型”。
 			result = append(result, PublicChannelCatalog{
 				ID:          channel.ID,
-				Name:        channel.Name,
-				DisplayName: channel.Name,
+				Name:        "",
+				DisplayName: "",
 				SortOrder:   channel.SortOrder,
 				Models:      publicModels,
 			})
diff --git a/backend/internal/app/resource_generated.go b/backend/internal/app/resource_generated.go
index db3e082d9..cc611f560 100644
--- a/backend/internal/app/resource_generated.go
+++ b/backend/internal/app/resource_generated.go
@@ -6,8 +6,10 @@ package app
 
 import (
 	"bytes"
+	"context"
 	"encoding/base64"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"image"
 	"io"
@@ -182,22 +184,30 @@ func downloadRemoteResource(rawURL string, maxBytes int64) (remoteResourcePayloa
 	if err != nil {
 		return remoteResourcePayload{}, err
 	}
-	client := OutboundHTTPClient(90 * time.Second)
+	client := OutboundHTTPClient(3 * time.Minute)
 	req, err := http.NewRequest(http.MethodGet, parsed.String(), nil)
 	if err != nil {
 		return remoteResourcePayload{}, err
 	}
 	resp, err := client.Do(req)
 	if err != nil {
-		return remoteResourcePayload{}, err
+		// 把下载层网络错误统一映射为可公开的 502/504 文案，避免在恢复接口上被 failService
+		// 折叠成通用的“系统处理失败”。同时保留真实原因在 Cause 里供诊断日志追踪。
+		if errors.Is(err, context.DeadlineExceeded) {
+			return remoteResourcePayload{}, WrapAppError(http.StatusGatewayTimeout, "远程资源下载超时，请检查地址是否可访问或稍后重试", err)
+		}
+		return remoteResourcePayload{}, WrapAppError(http.StatusBadGateway, "远程资源下载失败，请检查地址是否可访问", err)
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
-		return remoteResourcePayload{}, fmt.Errorf("远程资源下载失败：%s", resp.Status)
+		return remoteResourcePayload{}, WrapAppError(http.StatusBadGateway, fmt.Sprintf("远程资源下载失败：%s", resp.Status), nil)
 	}
 	data, err := io.ReadAll(io.LimitReader(resp.Body, maxBytes))
 	if err != nil {
-		return remoteResourcePayload{}, err
+		if errors.Is(err, context.DeadlineExceeded) {
+			return remoteResourcePayload{}, WrapAppError(http.StatusGatewayTimeout, "远程资源下载超时，请检查地址是否可访问或稍后重试", err)
+		}
+		return remoteResourcePayload{}, WrapAppError(http.StatusBadGateway, "远程资源读取失败，请检查地址是否可访问", err)
 	}
 	if int64(len(data)) >= maxBytes {
 		return remoteResourcePayload{}, BadAuthRequest(fmt.Sprintf("远程资源必须小于 %s", formatStorageLimit(maxBytes)))
diff --git a/web/src/components/canvas/canvas-agent-video-approval-settings.tsx b/web/src/components/canvas/canvas-agent-video-approval-settings.tsx
index da83aa349..38debac75 100644
--- a/web/src/components/canvas/canvas-agent-video-approval-settings.tsx
+++ b/web/src/components/canvas/canvas-agent-video-approval-settings.tsx
@@ -8,13 +8,7 @@ import { resolveCompatibleModel, type ModelRequirements } from "@/lib/model-sele
 import type { AgentMediaSettings } from "@/services/api/agent";
 import { PUBLIC_MODEL_CATALOG_ID, useEffectiveConfig } from "@/stores/use-config-store";
 
-export function CanvasAgentVideoApprovalSettings({ initial, value, theme, disabled, onChange }: {
-    initial: AgentVideoApproval;
-    value?: AgentMediaSettings;
-    theme: CanvasTheme;
-    disabled: boolean;
-    onChange: (value: AgentMediaSettings) => void;
-}) {
+export function CanvasAgentVideoApprovalSettings({ initial, value, theme, disabled, onChange }: { initial: AgentVideoApproval; value?: AgentMediaSettings; theme: CanvasTheme; disabled: boolean; onChange: (value: AgentMediaSettings) => void }) {
     const effective = useEffectiveConfig();
     const config = useMemo(() => ({ ...effective, channels: effective.channels.filter((channel) => channel.scope === "system" || channel.id === PUBLIC_MODEL_CATALOG_ID) }), [effective]);
     const settings = value || initial;
@@ -42,7 +36,15 @@ export function CanvasAgentVideoApprovalSettings({ initial, value, theme, disabl
         const profile = modelCapabilityConfigFor(config, next).video;
         if (!profile) return;
         const normalized = normalizeVideoValue(profile, { seconds: duration, ratio: settings.size, resolution: settings.quality });
-        onChange({ ...agentApprovalModelSelection(config, next), size: normalized.ratio, quality: normalized.resolution, durationSeconds: Number(normalized.seconds), videoGenerateAudio: settings.videoGenerateAudio, videoWatermark: settings.videoWatermark, videoArkPrivateAssetUpload: settings.videoArkPrivateAssetUpload });
+        onChange({
+            ...agentApprovalModelSelection(config, next),
+            size: normalized.ratio,
+            quality: normalized.resolution,
+            durationSeconds: Number(normalized.seconds),
+            videoGenerateAudio: settings.videoGenerateAudio,
+            videoWatermark: settings.videoWatermark,
+            videoArkPrivateAssetUpload: settings.videoArkPrivateAssetUpload,
+        });
     };
 
     const changeOption = (key: "vquality" | "size" | "videoSeconds" | "videoGenerateAudio" | "videoWatermark" | "videoArkPrivateAssetUpload", next: string) => {
@@ -75,12 +77,32 @@ export function CanvasAgentVideoApprovalSettings({ initial, value, theme, disabl
     return (
         <fieldset disabled={disabled} className="min-w-0 space-y-3 border-0 p-0" data-canvas-no-zoom data-canvas-wheel-scroll aria-label="视频生成设置">
             <div className="space-y-1.5">
-                <div className="text-xs" style={{ color: theme.node.muted }}>生成模型</div>
+                <div className="text-xs" style={{ color: theme.node.muted }}>
+                    生成模型
+                </div>
                 <ModelPicker config={config} capability="video" value={model} onChange={changeModel} requirements={requirements} variant="creation" fullWidth showOptionPrices placeholder="选择生成模型" popoverClassName="agent-model-picker-popover" />
             </div>
-            {model ? <VideoSettingsPanel config={{ ...config, model, size: settings.size, videoSeconds: duration, vquality: settings.quality, videoGenerateAudio: audio, videoWatermark: watermark, videoArkPrivateAssetUpload: privateAssetUpload }} onConfigChange={changeOption} theme={theme} showTitle={false} className="min-w-0 space-y-3" /> : <p className="text-xs" style={{ color: theme.node.muted }}>当前模型不在可选目录中，可重新选择；提交时将重新校验模型与规格。</p>}
-            <p className="text-xs" style={{ color: theme.node.text }}>本次规格：{settings.size}{settings.quality ? ` · ${settings.quality}` : ""}{settings.durationSeconds ? ` · ${settings.durationSeconds} 秒` : ""}</p>
-            <p className="text-xs" style={{ color: theme.node.muted }}>修改仅用于本次生成，费用按最终模型和规格计算。</p>
+            {model ? (
+                <VideoSettingsPanel
+                    config={{ ...config, model, size: settings.size, videoSeconds: duration, vquality: settings.quality, videoGenerateAudio: audio, videoWatermark: watermark, videoArkPrivateAssetUpload: privateAssetUpload }}
+                    onConfigChange={changeOption}
+                    theme={theme}
+                    showTitle={false}
+                    className="min-w-0 space-y-3"
+                />
+            ) : (
+                <p className="text-xs" style={{ color: theme.node.muted }}>
+                    当前模型不在可选目录中，可重新选择；提交时将重新校验模型与规格。
+                </p>
+            )}
+            <p className="text-xs" style={{ color: theme.node.text }}>
+                本次规格：{settings.size}
+                {settings.quality ? ` · ${settings.quality}` : ""}
+                {settings.durationSeconds ? ` · ${settings.durationSeconds} 秒` : ""}
+            </p>
+            <p className="text-xs" style={{ color: theme.node.muted }}>
+                修改仅用于本次生成，费用按最终模型和规格计算。
+            </p>
         </fieldset>
     );
 }
diff --git a/web/src/components/canvas/canvas-cloud-agent-panel-parts.tsx b/web/src/components/canvas/canvas-cloud-agent-panel-parts.tsx
index 85cf58c70..1a978fd25 100644
--- a/web/src/components/canvas/canvas-cloud-agent-panel-parts.tsx
+++ b/web/src/components/canvas/canvas-cloud-agent-panel-parts.tsx
@@ -571,7 +571,11 @@ export function ApprovalCard({
                     无法确认具体目标，继续前请重新读取画布。
                 </div>
             )}
-            {imageApproval ? <CanvasAgentImageApprovalSettings initial={imageApproval} value={mediaSettings} onChange={setMediaSettings} theme={theme} disabled={submitting} /> : videoApproval ? <CanvasAgentVideoApprovalSettings initial={videoApproval} value={mediaSettings} onChange={setMediaSettings} theme={theme} disabled={submitting} /> : null}
+            {imageApproval ? (
+                <CanvasAgentImageApprovalSettings initial={imageApproval} value={mediaSettings} onChange={setMediaSettings} theme={theme} disabled={submitting} />
+            ) : videoApproval ? (
+                <CanvasAgentVideoApprovalSettings initial={videoApproval} value={mediaSettings} onChange={setMediaSettings} theme={theme} disabled={submitting} />
+            ) : null}
             <button type="button" className="canvas-agent-approval-reason-toggle" aria-expanded={showReason} onClick={() => setShowReason((value) => !value)} disabled={submitting}>
                 {showReason ? "收起拒绝理由" : "填写拒绝理由（可选）"}
             </button>
diff --git a/web/src/components/canvas/previs/canvas-previs-workbench.tsx b/web/src/components/canvas/previs/canvas-previs-workbench.tsx
index 6312fb126..8ac6b80c1 100644
--- a/web/src/components/canvas/previs/canvas-previs-workbench.tsx
+++ b/web/src/components/canvas/previs/canvas-previs-workbench.tsx
@@ -79,7 +79,7 @@ export function CanvasPrevisWorkbench({
     onDeleteImageNode: (nodeId: string) => void;
     onFlush?: () => void | Promise<void>;
 }) {
-    const { message } = App.useApp();
+    const { message, modal } = App.useApp();
     const theme = canvasThemes[useActiveTheme()];
     const effectiveCanvasId = useMemo(() => {
         const explicit = canvasId?.trim();
@@ -241,6 +241,7 @@ export function CanvasPrevisWorkbench({
         resetWorkbench();
     }, [open, resetWorkbench, scene, writeDraft]);
 
+    // 打开会话时检查合法本地恢复候选
     // 父级项目收到 Agent 的预演台语义补丁后，scene.id 不变但 updatedAt 会变化；
     // 不能只按 scene.id 忽略，否则打开着的工作台永远看不到 Agent 的修改。
     useEffect(() => {
@@ -257,7 +258,7 @@ export function CanvasPrevisWorkbench({
         setSelectedBone(null);
         setPlayhead(0);
         message.info("Agent 已更新预演场景");
-    }, [message, open, scene, setPlayhead, setSelectedBone, setSelectedLightId, setSelectedObjectId, writeDraft]);
+    }, [message, modal, open, scene, writeDraft]);
 
     const activeShot = draft?.shots?.find((item) => item.id === draft.activeShotId) || draft?.shots?.[0] || null;
     const activeCamera = draft?.cameras?.find((item) => item.id === activeShot?.cameraId) || draft?.cameras?.[0] || null;
@@ -355,6 +356,7 @@ export function CanvasPrevisWorkbench({
         [writeAndPublish],
     );
 
+    // 打开会话时检查合法本地恢复候选之后，挂载暂存手势生命周期。
     // 暂存手势的终止生命周期：常驻安装，非活跃时 end 为空操作。
     useEffect(
         () =>
@@ -466,7 +468,14 @@ export function CanvasPrevisWorkbench({
                 return;
             }
             recordPrevisDiagnostic("PREVIS_CLOSE_BLOCKED", { sceneId: draftRef.current?.id, saveOutcome: "stay", revision: saveController.progress.revision });
-            message.error(decision.message);
+            modal.confirm({
+                title: "保存未完成",
+                content: decision.message,
+                okText: "放弃修改并关闭",
+                cancelText: "留在预演台",
+                okButtonProps: { danger: true },
+                onOk: onClose,
+            });
             closingRef.current = false;
         })();
     };
@@ -1246,6 +1255,12 @@ export function CanvasPrevisWorkbench({
                 <span className={`previs-desk-save ${saveStatusClass}`} aria-live="polite">
                     {saveIndicator.label}
                 </span>
+                {saveController.progress.status === "error" ? (
+                    <button type="button" className="previs-desk-header-action" onClick={() => void saveController.retrySave()}>
+                        <Save className="size-3.5" />
+                        重试保存
+                    </button>
+                ) : null}
                 {onboardingScope ? (
                     <button type="button" className="previs-desk-icon-button" aria-label="重新开始引导" title="重新开始引导" onClick={() => setOnboardingRestartSignal((value) => value + 1)}>
                         <Lightbulb className="size-4" />
diff --git a/web/src/components/canvas/previs/use-previs-save-coordinator.ts b/web/src/components/canvas/previs/use-previs-save-coordinator.ts
index 3fb80208f..20230799f 100644
--- a/web/src/components/canvas/previs/use-previs-save-coordinator.ts
+++ b/web/src/components/canvas/previs/use-previs-save-coordinator.ts
@@ -8,6 +8,7 @@ import type { PrevisScene } from "@/types/previs";
 export type PrevisSaveController = {
     progress: PrevisSaveProgress;
     commitScene: (scene: PrevisScene) => void;
+    retrySave: () => Promise<boolean>;
     prepareClose: () => Promise<PrevisCloseDecision>;
     handlePageHide: () => Promise<boolean>;
 };
@@ -59,7 +60,10 @@ export function usePrevisSaveCoordinator(input: { sceneId: string | null; initia
             coordinatorRef.current = null;
             const pending = coordinator.getSnapshot();
             if (pending.confirmedRevision < pending.revision) {
-                void coordinator.flushLatest().catch(() => undefined).finally(() => coordinator.dispose());
+                void coordinator
+                    .flushLatest()
+                    .catch(() => undefined)
+                    .finally(() => coordinator.dispose());
                 return;
             }
             coordinator.dispose();
@@ -79,6 +83,14 @@ export function usePrevisSaveCoordinator(input: { sceneId: string | null; initia
         [syncProgress],
     );
 
+    const retrySave = useCallback(async () => {
+        const coordinator = coordinatorRef.current;
+        if (!coordinator) return false;
+        const success = await coordinator.flushLatest();
+        syncProgress();
+        return success;
+    }, [syncProgress]);
+
     const prepareClose = useCallback(async () => {
         const coordinator = coordinatorRef.current;
         if (!coordinator) return "close" as PrevisCloseDecision;
@@ -107,5 +119,5 @@ export function usePrevisSaveCoordinator(input: { sceneId: string | null; initia
         }
     }, [syncProgress]);
 
-    return { progress, commitScene, prepareClose, handlePageHide };
+    return { progress, commitScene, retrySave, prepareClose, handlePageHide };
 }
diff --git a/web/src/lib/canvas/canvas-generation-result.ts b/web/src/lib/canvas/canvas-generation-result.ts
index f5269a610..f1a68eb48 100644
--- a/web/src/lib/canvas/canvas-generation-result.ts
+++ b/web/src/lib/canvas/canvas-generation-result.ts
@@ -45,8 +45,6 @@ export function commitCanvasGenerationResult(current: CanvasNodeData[], before:
     const existingIds = new Set(current.map((node) => node.id));
     return [
         ...committedWithAdditional,
-        ...additionalNodes
-            .filter((node) => !existingIds.has(node.id))
-            .map((node) => ({ ...node, position: { x: node.position.x + merged.position.x - result.position.x, y: node.position.y + merged.position.y - result.position.y } })),
+        ...additionalNodes.filter((node) => !existingIds.has(node.id)).map((node) => ({ ...node, position: { x: node.position.x + merged.position.x - result.position.x, y: node.position.y + merged.position.y - result.position.y } })),
     ];
 }
diff --git a/web/src/lib/canvas/canvas-generation-task-sync.ts b/web/src/lib/canvas/canvas-generation-task-sync.ts
index af76b7d17..e9ec1bae0 100644
--- a/web/src/lib/canvas/canvas-generation-task-sync.ts
+++ b/web/src/lib/canvas/canvas-generation-task-sync.ts
@@ -383,16 +383,16 @@ async function buildGenerationTaskNodeResults(node: CanvasNodeData, task: Genera
         const id = `${node.id}:task:${task.id}:image:${index}`;
         const existing = nodes.find((item) => item.id === id);
         const child = await buildGenerationTaskNodeResult(
-            existing
-                ? { ...node, ...existing, id, title: existing.title, position: existing.position, width: existing.width, height: existing.height }
-                : { ...node, id, title: `${node.title} · ${index + 1}`, parentId: undefined },
+            existing ? { ...node, ...existing, id, title: existing.title, position: existing.position, width: existing.width, height: existing.height } : { ...node, id, title: `${node.title} · ${index + 1}`, parentId: undefined },
             task,
             nodes,
             index,
         );
         children.push({
             ...child,
-            ...(existing ? { title: existing.title, position: existing.position, width: existing.metadata?.manualSize ? existing.width : child.width, height: existing.metadata?.manualSize ? existing.height : child.height } : { position: imageGenerationChildPosition(resultNode.position, resultNode.width, child, index) }),
+            ...(existing
+                ? { title: existing.title, position: existing.position, width: existing.metadata?.manualSize ? existing.width : child.width, height: existing.metadata?.manualSize ? existing.height : child.height }
+                : { position: imageGenerationChildPosition(resultNode.position, resultNode.width, child, index) }),
             metadata: {
                 ...child.metadata,
                 assetId: task.outputs?.find((output) => output.outputIndex === index)?.materializedAssetId,
diff --git a/web/src/lib/model-picker-groups.ts b/web/src/lib/model-picker-groups.ts
index a91fb73c0..fb50e7a2a 100644
--- a/web/src/lib/model-picker-groups.ts
+++ b/web/src/lib/model-picker-groups.ts
@@ -15,6 +15,7 @@ export { isDirectSystemModel } from "@/lib/model-selection";
 export function modelChannelLabel(config: AiConfig, value: string) {
     const channel = resolveModelChannel(config, value);
     const cost = channel.modelCosts?.find((item) => item.model === modelOptionName(value));
+    if (channel.scope === "system") return cost?.channelLabel?.trim() || "系统模型";
     return cost?.channelLabel?.trim() || channel.name || "未命名渠道";
 }
 
@@ -39,7 +40,7 @@ export function groupModelsForPicker(config: AiConfig, options: string[]): Model
             const key = JSON.stringify(["channel", channel.id]);
             groups.set(key, {
                 key,
-                label: channel.name || "未命名渠道",
+                label: channel.scope === "system" ? "系统模型" : channel.name || "未命名渠道",
                 icon: modelIcon(config, otherModels[0]),
                 scope: channel.id === PUBLIC_MODEL_CATALOG_ID ? "" : "我的模型",
                 kind: "channel",
diff --git a/web/src/pages/settings/model-default-grid.tsx b/web/src/pages/settings/model-default-grid.tsx
index 5a7ce572c..a7f008045 100644
--- a/web/src/pages/settings/model-default-grid.tsx
+++ b/web/src/pages/settings/model-default-grid.tsx
@@ -68,8 +68,8 @@ export function ModelDefaultGrid({ config, onChange }: { config: AiConfig; onCha
                                                 </span>
                                                 <span className="min-w-0 flex-1">
                                                     <span className="block truncate text-xs font-semibold">{modelDisplayName(config, model)}</span>
-                                                    <span className="mt-1 flex min-w-0 flex-wrap items-center gap-x-1.5 gap-y-1 text-[var(--fs-tiny)] text-foreground/45">
-                                                        <span className="max-w-full truncate">{channel.name || "未命名渠道"}</span>
+                                                    <span className="flex min-w-0 flex-wrap items-center gap-x-1.5 gap-y-1 text-[var(--fs-tiny)] text-foreground/45">
+                                                        <span className="max-w-full truncate">{channel.scope === "system" ? "系统模型" : channel.name || "未命名渠道"}</span>
                                                         <span className="model-default-option-scope">{channel.scope === "system" ? "系统" : "自定义"}</span>
                                                         {creditsEnabled && cost ? <span className="model-default-price">{formatPrice(cost.billingMode === "token" ? (cost.outputTokenPriceMicrocredits || 0) : cost.unitPriceMicrocredits)} /{cost.billingMode === "token" ? "百万 Token" : cost.billingMode === "per_second" ? "秒" : "次"}</span> : null}
                                                     </span>
diff --git a/web/src/services/agent-canvas-sync.ts b/web/src/services/agent-canvas-sync.ts
index 5ae0032c1..124cdb377 100644
--- a/web/src/services/agent-canvas-sync.ts
+++ b/web/src/services/agent-canvas-sync.ts
@@ -20,8 +20,11 @@ export function createAgentCanvasSync(options: Options) {
     let timer: ReturnType<typeof setTimeout> | undefined;
     const schedule = () => {
         if (disposed || running || timer || (!patches.length && !needsRefresh)) return;
-        const wait = patches.length ? options.batchMs ?? 40 : Math.max(options.batchMs ?? 40, (options.refreshIntervalMs ?? 1000) - (Date.now() - lastRefresh));
-        timer = setTimeout(() => { timer = undefined; void flush(); }, wait);
+        const wait = patches.length ? (options.batchMs ?? 40) : Math.max(options.batchMs ?? 40, (options.refreshIntervalMs ?? 1000) - (Date.now() - lastRefresh));
+        timer = setTimeout(() => {
+            timer = undefined;
+            void flush();
+        }, wait);
     };
     const flush = async () => {
         if (disposed || running) return;
@@ -30,8 +33,11 @@ export function createAgentCanvasSync(options: Options) {
         patches = [];
         try {
             if (batch.length) {
-                try { await options.applyPatches(batch); }
-                catch { needsRefresh = true; }
+                try {
+                    await options.applyPatches(batch);
+                } catch {
+                    needsRefresh = true;
+                }
             }
             if (!disposed && needsRefresh && Date.now() - lastRefresh >= (options.refreshIntervalMs ?? 1000)) {
                 needsRefresh = false;
@@ -51,7 +57,15 @@ export function createAgentCanvasSync(options: Options) {
             const patch = event.payload.canvasPatch as AgentCanvasPatch | undefined;
             if (patch && patch.canvasId === options.canvasId) {
                 patches.push(patch);
-            } else if (event.type === "canvas_updated" || event.type === "canvas_undone" || event.type === "generation_task_created" || event.type === "tool_failed" || event.type === "run_failed" || (event.type === "tool_completed" && ["canvas_apply_ops", "generate_media"].includes(String(event.payload.toolName)))) {
+            } else if (
+                !patches.length &&
+                (event.type === "canvas_updated" ||
+                    event.type === "canvas_undone" ||
+                    event.type === "generation_task_created" ||
+                    event.type === "tool_failed" ||
+                    event.type === "run_failed" ||
+                    (event.type === "tool_completed" && ["canvas_apply_ops", "generate_media"].includes(String(event.payload.toolName))))
+            ) {
                 // A patch may be dropped even after earlier patches succeeded.
                 // Keep the snapshot fallback available for every meaningful task
                 // boundary; refreshes remain rate-limited below.
@@ -59,7 +73,16 @@ export function createAgentCanvasSync(options: Options) {
             }
             schedule();
         },
-        reconcile() { if (!disposed) { needsRefresh = true; schedule(); } },
-        dispose() { disposed = true; if (timer) clearTimeout(timer); patches = []; },
+        reconcile() {
+            if (!disposed) {
+                needsRefresh = true;
+                schedule();
+            }
+        },
+        dispose() {
+            disposed = true;
+            if (timer) clearTimeout(timer);
+            patches = [];
+        },
     };
 }
diff --git a/web/src/services/api/resources.ts b/web/src/services/api/resources.ts
index 793624f81..db0751489 100644
--- a/web/src/services/api/resources.ts
+++ b/web/src/services/api/resources.ts
@@ -456,7 +456,10 @@ async function flushResourceAccessBatch() {
     }
 
     try {
-        const data = await http.post<{ items: ResourceAccessBatchItem[] }>("/resources/access", entries.map((entry) => entry.payload));
+        const data = await http.post<{ items: ResourceAccessBatchItem[] }>(
+            "/resources/access",
+            entries.map((entry) => entry.payload),
+        );
         await Promise.all(
             entries.map(async (entry, index) => {
                 try {
diff --git a/web/src/services/canvas-missing-resources.ts b/web/src/services/canvas-missing-resources.ts
new file mode 100644
index 000000000..da587e82a
--- /dev/null
+++ b/web/src/services/canvas-missing-resources.ts
@@ -0,0 +1,70 @@
+type JsonValue = null | boolean | number | string | JsonValue[] | { [key: string]: JsonValue };
+
+const RESOURCE_KEY = /^resource:([^/]+)$/;
+const RESOURCE_URL = /\/api\/resources\/([^/]+)\/file(?:[/?#]|$)/;
+const LOCATOR_KEY = /(?:storage|resource|preview|poster|thumbnail|content|url|locator|asset)/i;
+
+function resourceId(value: string) {
+    const storageMatch = value.match(RESOURCE_KEY);
+    if (storageMatch) return storageMatch[1];
+    return value.match(RESOURCE_URL)?.[1] || "";
+}
+
+function isMediaLocatorKey(key: string) {
+    return LOCATOR_KEY.test(key);
+}
+
+function collect(value: unknown, ids: Set<string>, key = "") {
+    if (typeof value === "string") {
+        if (isMediaLocatorKey(key)) {
+            const id = resourceId(value);
+            if (id) ids.add(id);
+        }
+        return;
+    }
+    if (Array.isArray(value)) {
+        value.forEach((item) => collect(item, ids, key));
+        return;
+    }
+    if (!value || typeof value !== "object") return;
+    Object.entries(value).forEach(([childKey, childValue]) => collect(childValue, ids, childKey));
+}
+
+export function canvasResourceIds(value: unknown) {
+    const ids = new Set<string>();
+    collect(value, ids);
+    return ids;
+}
+
+function clear(value: JsonValue, missing: Set<string>, serverReported: boolean, key = ""): JsonValue | undefined {
+    if (Array.isArray(value)) return value.map((item) => clear(item, missing, serverReported, key)).filter((item): item is JsonValue => item !== undefined);
+    if (!value || typeof value !== "object") {
+        if (typeof value === "string" && isMediaLocatorKey(key) && missing.has(resourceId(value))) return undefined;
+        return value;
+    }
+
+    const entries = Object.entries(value);
+    const invalidMedia =
+        !serverReported &&
+        entries.some(([childKey, childValue]) => {
+            if (typeof childValue !== "string" || !isMediaLocatorKey(childKey)) return false;
+            return missing.has(resourceId(childValue));
+        });
+    const output: Record<string, JsonValue> = {};
+    for (const [childKey, childValue] of entries) {
+        if (childKey === "assetId" && invalidMedia && !serverReported) continue;
+        if (serverReported && childKey !== "assetId" && isMediaLocatorKey(childKey)) continue;
+        if (typeof childValue === "string" && isMediaLocatorKey(childKey) && missing.has(resourceId(childValue))) continue;
+        if (childKey === "status" && childValue === "success" && invalidMedia) {
+            output[childKey] = "idle";
+            continue;
+        }
+        const next = clear(childValue, missing, serverReported, childKey);
+        if (next !== undefined) output[childKey] = next;
+    }
+    return output;
+}
+
+export function clearMissingCanvasResources<T>(value: T, missingIds: Set<string>, _scope = "", serverReported = false): T {
+    return clear(value as unknown as JsonValue, missingIds, serverReported) as T;
+}
diff --git a/web/src/stores/use-config-store.ts b/web/src/stores/use-config-store.ts
index f974d4d93..3835f7821 100644
--- a/web/src/stores/use-config-store.ts
+++ b/web/src/stores/use-config-store.ts
@@ -362,7 +362,7 @@ export const useConfigStore = create<ConfigStore>()(
                         createModelChannel({
                             ...channel,
                             id: channel.id || `system-${index + 1}`,
-                            name: channel.name || `系统渠道 ${index + 1}`,
+                            name: "系统模型",
                             scope: "system",
                             apiKey: channel.apiKey || "system",
                         }),
diff --git a/web/test/canvas-operations-build.test.ts b/web/test/canvas-operations-build.test.ts
index 4838e4249..fbf1fb6c7 100644
--- a/web/test/canvas-operations-build.test.ts
+++ b/web/test/canvas-operations-build.test.ts
@@ -5,8 +5,19 @@ import type { CanvasProject } from "@/stores/canvas/use-canvas-store";
 
 function canvas(patch: Partial<CanvasProject> = {}): CanvasProject {
     return {
-        id: "canvas", title: "自由画布 1", createdAt: "", updatedAt: "", nodes: [], connections: [], chatSessions: [], activeChatId: null,
-        backgroundMode: "dots" as CanvasProject["backgroundMode"], showImageInfo: false, viewport: { x: 0, y: 0, k: 1 }, previsScenes: [], ...patch,
+        id: "canvas",
+        title: "自由画布 1",
+        createdAt: "",
+        updatedAt: "",
+        nodes: [],
+        connections: [],
+        chatSessions: [],
+        activeChatId: null,
+        backgroundMode: "dots" as CanvasProject["backgroundMode"],
+        showImageInfo: false,
+        viewport: { x: 0, y: 0, k: 1 },
+        previsScenes: [],
+        ...patch,
     };
 }
 
@@ -23,23 +34,28 @@ describe("画布 operations 生成", () => {
     });
 
     test("修复旧 journal：移除新画布中重复的 set_field，保留 mutationId", () => {
-        const legacy = JSON.parse(JSON.stringify({
-            mutationId: "m-1",
-            operations: [
-                { type: "create_canvas", id: "canvas", patch: { title: "自由画布 1" } },
-                { type: "set_field", field: "title", value: "自由画布 1", beforeValue: undefined },
-            ],
-        }));
+        const legacy = JSON.parse(
+            JSON.stringify({
+                mutationId: "m-1",
+                operations: [
+                    { type: "create_canvas", id: "canvas", patch: { title: "自由画布 1" } },
+                    { type: "set_field", field: "title", value: "自由画布 1", beforeValue: undefined },
+                ],
+            }),
+        );
         const repaired = repairPendingCanvasMutationRequest(legacy, undefined, canvas());
         expect(repaired.mutationId).toBe("m-1");
         expect(repaired.operations).toEqual([{ type: "create_canvas", id: "canvas", patch: { title: "自由画布 1" } }]);
     });
 
     test("修复旧 journal：移除空 projectId 到缺省值的语义 no-op", () => {
-        const legacy = { mutationId: "m-3", operations: [
-            { type: "create_node", node: { id: "node-1" } },
-            { type: "set_field", field: "projectId", value: null, beforeValue: "" },
-        ] } as never;
+        const legacy = {
+            mutationId: "m-3",
+            operations: [
+                { type: "create_node", node: { id: "node-1" } },
+                { type: "set_field", field: "projectId", value: null, beforeValue: "" },
+            ],
+        } as never;
         const repaired = repairPendingCanvasMutationRequest(legacy, canvas({ projectId: "" }), canvas({ projectId: undefined }));
         expect(repaired.mutationId).toBe("m-3");
         expect(repaired.operations).toEqual([{ type: "create_node", node: { id: "node-1" } }]);
diff --git a/web/test/model-picker-groups.test.ts b/web/test/model-picker-groups.test.ts
index 03c8eb717..468502038 100644
--- a/web/test/model-picker-groups.test.ts
+++ b/web/test/model-picker-groups.test.ts
@@ -35,7 +35,7 @@ test("same model display name groups all channels and preserves their prices", (
     expect(groups).toHaveLength(1);
     expect(config.channels.map((channel) => channel.modelCosts![0].description)).toEqual(["", "优惠渠道-993的使用说明", "特惠渠道-730的使用说明"]);
     expect(groups.map((group) => [group.label, group.kind, group.models.map((item) => [item.label, item.models])])).toEqual([
-        ["Seedance 2.0", "product", [["正常渠道", ["a::seedance-2.0"]], ["优惠渠道-993", ["b::seedance-2.0"]], ["特惠渠道-730", ["c::seedance-2.0"]]]],
+        ["Seedance 2.0", "product", [["系统模型", ["a::seedance-2.0"]], ["优惠渠道-993", ["b::seedance-2.0"]], ["特惠渠道-730", ["c::seedance-2.0"]]]],
     ]);
     expect(config.channels.map((channel) => priceTierSummaryLabel(priceTiersForCurrentSelection(channel.modelCosts![0].logicalPriceTiers!, "video", config)))).toEqual(["0.3 积分/秒", "0.3 积分/秒", "0.2 积分/秒"]);
 });