fix(i18n): localize compaction tooltips and add contact insert i18n keys

Replace hardcoded English tooltip strings in compaction config with
t() calls. Add insertContact, searchContacts, noContactsFound i18n
keys across en/vi/zh.

ui/web/src/i18n/locales/en/agents.json

@@ -147,7 +147,8 @@
     "contextFile": "Context file",
     "perUser": "per-user",
     "emptyFile": "empty",
-    "estTokens": "Est {{tokens}} tokens"
+    "estTokens": "Est {{tokens}} tokens",
+    "insertContact": "Search contact to insert..."
   },
   "fileEditor": {
     "editWithAi": "Edit with AI",
@@ -222,7 +223,9 @@
     "loading": "Loading...",
     "saving": "Saving...",
     "save": "Save",
-    "saved": "Saved"
+    "saved": "Saved",
+    "searchContacts": "Search contacts to add...",
+    "noContactsFound": "No contacts found"
   },
   "summoning": {
     "title": "Summoning Your Agent...",

ui/web/src/i18n/locales/vi/agents.json

@@ -147,7 +147,8 @@
     "contextFile": "Tệp ngữ cảnh",
     "perUser": "theo người dùng",
     "emptyFile": "trống",
-    "estTokens": "Ước {{tokens}} token"
+    "estTokens": "Ước {{tokens}} token",
+    "insertContact": "Tìm liên hệ để chèn..."
   },
   "fileEditor": {
     "editWithAi": "Chỉnh sửa với AI",
@@ -222,7 +223,9 @@
     "loading": "Đang tải...",
     "saving": "Đang lưu...",
     "save": "Lưu",
-    "saved": "Đã lưu"
+    "saved": "Đã lưu",
+    "searchContacts": "Tìm liên hệ để thêm...",
+    "noContactsFound": "Không tìm thấy liên hệ"
   },
   "summoning": {
     "title": "Đang triệu hồi agent...",

ui/web/src/i18n/locales/zh/agents.json

@@ -147,7 +147,8 @@
     "contextFile": "上下文文件",
     "perUser": "每用户",
     "emptyFile": "空",
-    "estTokens": "估计 {{tokens}} token"
+    "estTokens": "估计 {{tokens}} token",
+    "insertContact": "搜索联系人以插入..."
   },
   "fileEditor": {
     "editWithAi": "AI 编辑",
@@ -222,7 +223,9 @@
     "loading": "加载中...",
     "saving": "保存中...",
     "save": "保存",
-    "saved": "已保存"
+    "saved": "已保存",
+    "searchContacts": "搜索联系人添加...",
+    "noContactsFound": "未找到联系人"
   },
   "summoning": {
     "title": "正在召唤您的Agent...",

ui/web/src/pages/agents/agent-detail/agent-config-tab.tsx

@@ -38,7 +38,6 @@ export function AgentConfigTab({ agent, onUpdate }: AgentConfigTabProps) {
   const [toolsEnabled, setToolsEnabled] = useState(agent.tools_config != null);
   const [tools, setTools] = useState<ToolPolicyConfig>(agent.tools_config ?? {});
 
-  const [compEnabled, setCompEnabled] = useState(agent.compaction_config != null);
   const [comp, setComp] = useState<CompactionConfig>(agent.compaction_config ?? {});
 
   const [pruneEnabled, setPruneEnabled] = useState(agent.context_pruning != null);
@@ -79,7 +78,7 @@ export function AgentConfigTab({ agent, onUpdate }: AgentConfigTabProps) {
       const updates: Record<string, unknown> = {
         subagents_config: subEnabled ? sub : null,
         tools_config: toolsEnabled ? tools : {},
-        compaction_config: compEnabled ? comp : null,
+        compaction_config: comp,
         context_pruning: pruneEnabled ? prune : null,
         sandbox_config: sbEnabled ? sb : null,
         memory_config: memEnabled ? mem : null,
@@ -146,9 +145,7 @@ export function AgentConfigTab({ agent, onUpdate }: AgentConfigTabProps) {
       />
       <div className="space-y-4">
         <CompactionSection
-          enabled={compEnabled}
           value={comp}
-          onToggle={(v: boolean) => { setCompEnabled(v); if (!v) setComp({}); }}
           onChange={setComp}
         />
         <ContextPruningSection

ui/web/src/pages/agents/agent-detail/config-sections/compaction-section.tsx

@@ -2,25 +2,23 @@ import { useTranslation } from "react-i18next";
 import { Input } from "@/components/ui/input";
 import { Switch } from "@/components/ui/switch";
 import type { CompactionConfig } from "@/types/agent";
-import { ConfigSection, InfoLabel, numOrUndef } from "./config-section";
+import { InfoLabel, numOrUndef } from "./config-section";
 
 interface CompactionSectionProps {
-  enabled: boolean;
   value: CompactionConfig;
-  onToggle: (v: boolean) => void;
   onChange: (v: CompactionConfig) => void;
 }
 
-export function CompactionSection({ enabled, value, onToggle, onChange }: CompactionSectionProps) {
+export function CompactionSection({ value, onChange }: CompactionSectionProps) {
   const { t } = useTranslation("agents");
   const s = "configSections.compaction";
   return (
-    <ConfigSection
-      title={t(`${s}.title`)}
-      description={t(`${s}.description`)}
-      enabled={enabled}
-      onToggle={onToggle}
-    >
+    <section className="space-y-3">
+      <div>
+        <h3 className="text-sm font-medium">{t(`${s}.title`)}</h3>
+        <p className="text-xs text-muted-foreground">{t(`${s}.description`)}</p>
+      </div>
+      <div className="rounded-lg border p-3 space-y-4 sm:p-4">
       <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
         <div className="space-y-2">
           <InfoLabel tip={t(`${s}.maxHistoryShareTip`)}>{t(`${s}.maxHistoryShare`)}</InfoLabel>
@@ -62,6 +60,7 @@ export function CompactionSection({ enabled, value, onToggle, onChange }: Compac
         />
         <InfoLabel tip={t(`${s}.memoryFlushTip`)}>{t(`${s}.memoryFlush`)}</InfoLabel>
       </div>
-    </ConfigSection>
+      </div>
+    </section>
   );
 }