优化: 工具失败视觉区分(UX-01)+旧卡自动收起增强(UX-03)

src/i18n/en/ai.ts

@@ -23,7 +23,8 @@ export default {
     errorTimeout: 'The response timed out. Please try again.',
     errorNetwork: 'Network connection failed. Please check your network.',
     // CR-30-2 / F-260616-07(d) / decision a1: stream pre-failure retry bubble copy
-    aiStreamRetry: '⚠ Request failed, retrying ({attempt}/{max})…',
+    // UX-260616-01: clarify this is an AI response (network/rate-limit) retry, not a tool failure (shown in card)
+    aiStreamRetry: '⚠ AI response failed, retrying ({attempt}/{max})…',
     // UX-260616-01: Fatal errors (4xx/auth) are not retryable — prompt user to check settings instead
     notRetryable: 'This error cannot be resolved by retrying. Please check the configuration.',
     streamInterruptedAfterTool: '⚠ The tool finished, but the following reply was interrupted (no data stream for a long time). You can click Continue to retry.',

src/i18n/en/aiTool.ts

@@ -8,6 +8,9 @@ export default {
     rejectedHint: 'User rejected this action',
     // B-260616-12: tool execution slow hint (frontend fallback, no backend cancel IPC)
     executionSlow: 'Tool "{name}" is taking longer than expected, please wait…',
+    // UX-260616-01: tool execution failure marker (AR-6 keeps status=completed, red to distinguish from success)
+    executionFailed: 'Failed',
+    executionFailedHint: 'Tool execution failed, see details below',
     collapse: 'Collapse',
     expandAll: 'Expand all',
     collapseAll: 'Collapse all',