diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d65287..a8480fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## v0.7.0 - 2026-07-14
+
 + [新增] Agent 对话消息改用 streamdown 流式渲染，提升Markdown 内容展示效果。
 + [新增] Agent 新增画布、工作台、提示词库和素材等站点级工具。
 + [新增] Agent 面板改为全站常驻右侧栏，开关时同步推动顶栏和页面内容，并保留独立入口按钮。
@@ -16,6 +18,7 @@
 + [调整] 画布节点顶部工具条改为点击选中节点后显示，避免鼠标经过节点时频繁弹出。
 + [优化] 本地 Agent 连接说明明确区分插件 / 手动 MCP 才会增加 Codex token 消耗。
 + [优化] 优化本地 Agent 连接说明，区分 Codex 插件启动和直接运行 Agent 两种方式。
++ [修复] 修复 Gemini 格式生图时因内置比例列表触发误报导致生成失败的问题。
 
 ## v0.6.0 - 2026-07-09
 
diff --git a/canvas-agent/package.json b/canvas-agent/package.json
index 06f2d4e..3c6287a 100644
--- a/canvas-agent/package.json
+++ b/canvas-agent/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@basketikun/canvas-agent",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "type": "module",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/web/src/components/canvas/canvas-local-agent-panel.tsx b/web/src/components/canvas/canvas-local-agent-panel.tsx
index 79412b0..6ec1786 100644
--- a/web/src/components/canvas/canvas-local-agent-panel.tsx
+++ b/web/src/components/canvas/canvas-local-agent-panel.tsx
@@ -2,7 +2,7 @@ import { Fragment, useCallback, useEffect, useMemo, useRef, useState } from "rea
 import { useNavigate, useSearchParams } from "react-router-dom";
 import { App, Button, Input, Segmented, Tooltip } from "antd";
 import copyToClipboard from "copy-to-clipboard";
-import { Copy, FolderOpen, History, KeyRound, Link2, LoaderCircle, PlugZap, Plus, RefreshCw, RotateCcw, Square, Terminal, Trash2 } from "lucide-react";
+import { Copy, FolderOpen, History, KeyRound, Link2, LoaderCircle, PlugZap, Plus, RefreshCw, Square, Terminal, Trash2 } from "lucide-react";
 
 import { canvasThemes } from "@/lib/canvas-theme";
 import { useThemeStore } from "@/stores/use-theme-store";
@@ -320,14 +320,6 @@ export function CanvasLocalAgentPanel({ embedded, headless, autoConnect }: { emb
         await runToolCall(endpoint, token, tool);
     };
 
-    const undoLastTool = () => {
-        const restored = canvasContextRef.current?.undoOps() || null;
-        if (!restored) return;
-        setAgentState({ activity: "已撤销" });
-        addMessage({ role: "tool", title: "已撤销", text: "上一次工具操作", detail: restored });
-        if (connected) void postState(endpoint, token, clientIdRef.current, restored);
-    };
-
     const toggleAgentConnection = async ({ silent = false }: { silent?: boolean } = {}) => {
         if (enabled) {
             clearAgentSession({ enabled: false, connected: false, activity: "离线", connectError: "" });
@@ -513,8 +505,8 @@ export function CanvasLocalAgentPanel({ embedded, headless, autoConnect }: { emb
                 }}
                 right={
                     <>
-                        <Button size="small" type="text" disabled={!canvasContext?.canUndo} icon={<RotateCcw className="size-3.5" />} onClick={undoLastTool}>
-                            撤销
+                        <Button size="small" type="text" disabled={!connected || loadingThreads} icon={<Plus className="size-3.5" />} onClick={startNewThread}>
+                            新对话
                         </Button>
                     </>
                 }
diff --git a/web/src/services/api/image.ts b/web/src/services/api/image.ts
index 3d08b75..1959759 100644
--- a/web/src/services/api/image.ts
+++ b/web/src/services/api/image.ts
@@ -146,16 +146,21 @@ function resolveSize(quality: string | undefined, ratio: string): string {
     return `${width}x${height}`;
 }
 
-function parseImageRatio(value: string) {
+function parseRatioValue(value: string) {
     const parts = value.split(":");
     if (parts.length !== 2) throw new Error("图像尺寸格式不支持，请使用 auto、9:16 或 1024x1024");
     const w = Number(parts[0]);
     const h = Number(parts[1]);
     if (!Number.isFinite(w) || !Number.isFinite(h) || w <= 0 || h <= 0) throw new Error("图像比例必须是正数，例如 9:16");
-    if (Math.max(w, h) / Math.min(w, h) > IMAGE_MAX_RATIO) throw new Error("图像宽高比不能超过 3:1，请调整尺寸");
     return { width: w, height: h };
 }
 
+function parseImageRatio(value: string) {
+    const ratio = parseRatioValue(value);
+    if (Math.max(ratio.width, ratio.height) / Math.min(ratio.width, ratio.height) > IMAGE_MAX_RATIO) throw new Error("图像宽高比不能超过 3:1，请调整尺寸");
+    return ratio;
+}
+
 function parseImageDimensions(value: string) {
     const match = value.match(/^(\d+)x(\d+)$/i);
     if (!match) return null;
@@ -197,8 +202,8 @@ function closestGeminiAspectRatio(value: string) {
     const ratio = parseImageRatio(value);
     const target = ratio.width / ratio.height;
     return GEMINI_SUPPORTED_RATIOS.reduce((best, item) => {
-        const current = parseImageRatio(item);
-        const bestRatio = parseImageRatio(best);
+        const current = parseRatioValue(item);
+        const bestRatio = parseRatioValue(best);
         return Math.abs(current.width / current.height - target) < Math.abs(bestRatio.width / bestRatio.height - target) ? item : best;
     });
 }