feat: collapsible tool output (collapsed by default like thinking)

Tool calls and results now use the same DaisyUI collapse pattern as
thinking blocks — collapsed by default, click to expand. Each card
shows the tool name + a wrench icon in the title; expanding reveals
the input/output with overflow-x-auto for long lines and max-h-96
overflow-y-auto for very long output.

Batched tool calls: each entry is its own collapse card (was a DaisyUI
list). Pending results show a spinner in the title. Errors show a red
badge.

686 tests green.

0 files changed, 0 insertions, 0 deletions