feat(agents): support chat to agent (#403)

src/i18n/locales/en/agents.json

@@ -1,6 +1,6 @@
 {
     "title": "Agents",
-    "subtitle": "Manage your OpenClaw agents and their channel ownership",
+    "subtitle": "When adding a new Agent, ClawX will copy the main Agent's workspace files and runtime auth setup. The configuration can be modified through a dialog.",
     "refresh": "Refresh",
     "addAgent": "Add Agent",
     "gatewayWarning": "Gateway service is not running. Agent/channel changes may take a moment to apply.",
@@ -48,4 +48,4 @@
         "channelRemoved": "{{channel}} removed",
         "channelRemoveFailed": "Failed to remove channel: {{error}}"
     }
-}
+}

src/i18n/locales/en/channels.json

@@ -1,6 +1,6 @@
 {
     "title": "Messaging Channels",
-    "subtitle": "Manage your messaging channels and connections",
+    "subtitle": "Manage your messaging channels and connections. The configuration is only effective for the main Agent.",
     "refresh": "Refresh",
     "addChannel": "Add Channel",
     "stats": {

src/i18n/locales/en/chat.json

@@ -13,7 +13,21 @@
     "toolbar": {
         "refresh": "Refresh chat",
         "showThinking": "Show thinking",
-        "hideThinking": "Hide thinking"
+        "hideThinking": "Hide thinking",
+        "currentAgent": "Talking to {{agent}}"
+    },
+    "composer": {
+        "attachFiles": "Attach files",
+        "pickAgent": "Choose agent",
+        "clearTarget": "Clear target agent",
+        "targetChip": "@{{agent}}",
+        "agentPickerTitle": "Route the next message to another agent",
+        "gatewayDisconnectedPlaceholder": "Gateway not connected...",
+        "send": "Send",
+        "stop": "Stop",
+        "gatewayConnected": "connected",
+        "gatewayStatus": "gateway {{state}} | port: {{port}} {{pid}}",
+        "retryFailedAttachments": "Retry failed attachments"
     },
     "historyBuckets": {
         "today": "Today",