tui: improve agent tab separator visual with powerline symbol for better session distinction

opencode.json

@@ -1,14 +1,4 @@
 {
   "$schema": "https://opencode.ai/config.json",
-  "plugin": ["opencode-openai-codex-auth"],
-  "mcp": {
-    "weather": {
-      "type": "local",
-      "command": ["bun", "x", "@h1deya/mcp-server-weather"]
-    },
-    "puppeteer": {
-      "type": "local",
-      "command": ["buns", "x", "puppeteer-mcp-server"]
-    }
-  }
+  "plugin": ["opencode-openai-codex-auth"]
 }

packages/opencode/src/cli/cmd/tui/attach.tsx

@@ -223,10 +223,9 @@ function App(props: { onExit: () => void }) {
           <text fg={Theme.textMuted} paddingRight={1}>
             tab
           </text>
-          <text fg={local.agent.color(local.agent.current().name)}>┃</text>
+          <text fg={local.agent.color(local.agent.current().name)}>{""}</text>
           <text bg={local.agent.color(local.agent.current().name)} fg={Theme.background} wrap={false}>
-            {" "}
-            <span style={{ bold: true }}>{local.agent.current().name.toUpperCase()}</span>
+            <span style={{ bold: true }}> {local.agent.current().name.toUpperCase()}</span>
             <span> AGENT </span>
           </text>
         </box>