fix(about): handle prerelease tools in version check

Use semver comparison instead of string inequality so locally-ahead prerelease builds aren't misreported as outdated; backend now fetches the full npm dist-tags and, when the local version leads latest, surfaces the tool's prerelease channel (claude=next) as latest.

src/components/settings/AboutSection.tsx

@@ -40,6 +40,7 @@ import { APP_ICON_MAP } from "@/config/appConfig";
 import type { AppId } from "@/lib/api/types";
 import { extractErrorMessage } from "@/utils/errorUtils";
 import { isWindows } from "@/lib/platform";
+import { isUpdateAvailable } from "@/lib/version";
 import { ToolUpgradeConfirmDialog } from "./ToolUpgradeConfirmDialog";
 import { ToolInstallRow } from "./ToolInstallRow";
 
@@ -238,11 +239,7 @@ export function AboutSection({ isPortable }: AboutSectionProps) {
     () =>
       TOOL_NAMES.filter((toolName) => {
         const tool = toolVersionByName.get(toolName);
-        return Boolean(
-          tool?.version &&
-            tool.latest_version &&
-            tool.version !== tool.latest_version,
-        );
+        return isUpdateAvailable(tool?.version, tool?.latest_version);
       }),
     [toolVersionByName],
   );
@@ -545,8 +542,7 @@ export function AboutSection({ isPortable }: AboutSectionProps) {
               action === "update" &&
               Boolean(previousVersion) &&
               tool.version === previousVersion &&
-              Boolean(latestVersion) &&
-              tool.version !== latestVersion;
+              isUpdateAvailable(tool.version, latestVersion);
 
             if (versionUnchangedAfterUpdate) {
               // 有些上游 updater 会在未实际改动版本时仍返回 0。这里用刷新后的
@@ -949,10 +945,9 @@ export function AboutSection({ isPortable }: AboutSectionProps) {
             const displayName = TOOL_DISPLAY_NAMES[toolName];
             const isToolVersionLoading =
               isLoadingTools || Boolean(loadingTools[toolName]);
-            const isOutdated = Boolean(
-              tool?.version &&
-                tool.latest_version &&
-                tool.version !== tool.latest_version,
+            const isOutdated = isUpdateAvailable(
+              tool?.version,
+              tool?.latest_version,
             );
             // 已安装却跑不起来（如 Node 版本不达标）：用它区分卡片文案与按钮，避免把
             // "装了跑不起来"误判成"未安装"而给出无用的安装按钮（重装同一版本解决不了）。