tui: use arrow indicator to clearly show active tool execution in session view

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -1979,8 +1979,8 @@ function Task(props: ToolProps<typeof TaskTool>) {
 
     if (isRunning() && tools().length > 0) {
       // content[0] += ` · ${tools().length} toolcalls`
-      if (current()) content.push(`└ ${Locale.titlecase(current()!.tool)} ${(current()!.state as any).title}`)
-      else content.push(`└ Running...`)
+      if (current()) content.push(`⤷ ${Locale.titlecase(current()!.tool)} ${(current()!.state as any).title}`)
+      else content.push(`⤷ Running...`)
     }
 
     if (props.part.state.status === "completed") {