* refactor(chat-ui): render tool calls as flat expandable rows
Replace the nested ToolCallCard/ToolResultCard/pending-tool cards inside
assistant bubbles with flat rows that mirror the web Control UI: chevron +
kind icon + title + one-line mono detail, result folded into the row and
revealed on tap (Show all for long outputs). Tool-only messages no longer
render bubble chrome.
* chore(i18n): sync native inventory + translations for tool-row strings
