tui: simplify task tool display with cleaner tree indentation

Replaces the '⋮' icon with '│' and updates the tree formatting to use

consistent '└' characters for better visual hierarchy when showing

running and completed task states.

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

@@ -1975,23 +1975,19 @@ function Task(props: ToolProps<typeof TaskTool>) {
 
   return (
     <InlineTool
-      icon="⋮"
+      icon="│"
       spinner={isRunning()}
       complete={props.input.description}
       pending="Delegating..."
       part={props.part}
     >
       Task {props.input.description}
-      <Show when={isRunning() && tools().length > 0}>
-        {" "}
-        · {tools().length} toolcalls
-        <Show fallback={"\n⤷ Running..."} when={current()}>
-          {"\n"}⤷ {Locale.titlecase(current()!.tool)} {(current()!.state as any).title}
-        </Show>
+      <Show when={isRunning() && tools().length > 0}> · {tools().length} toolcalls</Show>
+      <Show fallback={"\n└ Running..."} when={current()}>
+        {"\n└"} {Locale.titlecase(current()!.tool)} {(current()!.state as any).title}
       </Show>
       <Show when={duration() && props.part.state.status === "completed"}>
-        {"\n  ⤷ "}
-        {tools().length} toolcalls · {Locale.duration(duration())}
+        {"\n└ "} {tools().length} toolcalls · {Locale.duration(duration())}
       </Show>
     </InlineTool>
   )