sync update from LAN repo (source dhk-1 @ 3b1ec5b4)

frontend-web/scripts/check-chrome109-css.mjs

@@ -78,6 +78,31 @@ const requiredLegacyFallbacks = [
     pattern: /minHeight:[\s\S]*100vh[\s\S]*maxHeight:[\s\S]*100vh/,
     description: "Skill file preview must size with vh, not dvh, for Chrome 102",
   },
+  {
+    file: "src/core/compat/abort-signal.ts",
+    pattern: /export function installAbortSignalTimeout[\s\S]*AbortSignal/,
+    description: "LangGraph SDK timeoutMs needs AbortSignal.timeout for Chrome 102",
+  },
+  {
+    file: "src/core/api/api-client.ts",
+    pattern: /function installLegacyControlTimeout[\s\S]*AbortSignal\.timeout/,
+    description: "Chat send must skip AbortSignal.timeout when Chrome 102 lacks it",
+  },
+  {
+    file: "index.html",
+    pattern: /AbortSignal\.timeout = function/,
+    description: "Chrome 102 needs AbortSignal.timeout before any module loads",
+  },
+  {
+    file: "src/styles/globals.css",
+    pattern: /\.workspace-chat-bg,\s*\n\s*\.canvas-writing-bg\s*\{\s*background-color:\s*var\(--background\);/,
+    description: "Agent chat canvas needs an explicit token background for Chrome 102",
+  },
+  {
+    file: "src/styles/globals.css",
+    pattern: /@supports not \(translate: 0\)[\s\S]*\.dialog-content-center\s*\{\s*transform:\s*translate\(-50%,\s*-50%\);/,
+    description: "Dialog centering needs a transform fallback for Chrome 102",
+  },
 ];
 
 for (const file of cssFiles) {