fix(settings): update chat channel icons to Play/Square and SendHorizontal

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/settings/channel-list-tab.tsx

@@ -5,9 +5,9 @@ import {
   Loader2,
   MessageCircle,
   Pencil,
+  Play,
   Plus,
-  Power,
-  PowerOff,
+  Square,
   Trash2,
   Zap,
 } from "lucide-react"
@@ -290,7 +290,7 @@ export function ChannelListTab() {
                       {isLoading ? (
                         <Loader2 className="h-3.5 w-3.5 animate-spin" />
                       ) : (
-                        <PowerOff className="h-3.5 w-3.5" />
+                        <Square className="h-3.5 w-3.5" />
                       )}
                     </Button>
                   ) : (
@@ -304,7 +304,7 @@ export function ChannelListTab() {
                       {isLoading ? (
                         <Loader2 className="h-3.5 w-3.5 animate-spin" />
                       ) : (
-                        <Power className="h-3.5 w-3.5" />
+                        <Play className="h-3.5 w-3.5" />
                       )}
                     </Button>
                   )}

src/components/settings/settings-shell.tsx

@@ -12,7 +12,7 @@ import {
   GitBranch,
   Globe,
   Keyboard,
-  BotMessageSquare,
+  SendHorizontal,
   Palette,
   PlugZap,
   Server,
@@ -82,7 +82,7 @@ const SETTINGS_NAV_ITEMS: SettingsNavItem[] = [
   {
     href: "/settings/chat-channels",
     labelKey: "chat_channels",
-    icon: BotMessageSquare,
+    icon: SendHorizontal,
   },
   {
     href: "/settings/web-service",