Render bash batch mode in TUI tool_call line

[hoblin]

Problem to solve

When the agent invokes the bash tool in batch mode (commands: [...], mode: "parallel"|"sequential"), the TUI verbose tool_call line renders as just $ with an empty command. The reader can't see what's about to run; the tool_response panel shows the per-command outputs ([1/5] $ sleep 5, …), so the information leaks back later — but the call line itself is uninformative.

Solution

Update ToolCallDecorator#format_input to handle the batch-mode shape — render either each command on its own line prefixed with $ (preserving the per-line look that matches the response panel), or a single $ commands × N (mode: parallel) summary, depending on view density. The single-command branch stays unchanged.

Where

• app/decorators/tool_call_decorator.rb:132-144 — format_input, when "bash" branch only handles input&.dig("command"). Add a branch for input["commands"].is_a?(Array).
• lib/tools/bash.rb:23-37 — schema reference: tool accepts command (string) OR commands (array) + mode ("sequential"|"parallel").

Reproduce

1. Ask Ani: "sleep 5 times in parallel with different durations".
2. Ani picks Bash batch mode (mode: "parallel", commands: ["sleep 5", "sleep 10", …]) — one tool_use, one tool_response.
3. TUI verbose tool_call line shows:

   💻 bash
     $
   

Suggested rendering

Compact batch summary:

💻 bash (parallel × 5)
  $ sleep 5
  $ sleep 10
  $ sleep 15
  $ sleep 20
  $ sleep 25

Or, for very wide batches, truncate with the existing truncate_lines helper (used by the generic fallback at line 142).

Why this stays in the decorator

The TUI is purely a rendering surface. Bash batch shape is already a stable part of the tool API (per lib/tools/bash.rb); only the rendering needs to keep up. No model or pipeline changes required.

Acceptance

• Verbose tool_call line shows the actual commands when batch mode is used
• Single-command path still renders $ <command> exactly as today
• Spec coverage in spec/decorators/tool_call_decorator_spec.rb for both shapes