feat: rich tool visualization with ExecCell component - #268
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Implement comprehensive tool execution visualization for codi-rs TUI: ## New Components - **ExecCell**: Rich visual display for tool calls - Color-coded status (yellow=running, green=success, red=error) - Animated spinner during execution (⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏) - Live output streaming (last 5 lines displayed) - Duration tracking with ms/s precision - Expandable view for full input/output JSON - Input parameter preview with truncation - **ExecCellManager**: Track multiple concurrent tool executions - Add/remove/get cells by ID - Running count and cell filtering - Spinner animation tick for all running cells - Automatic cleanup of old completed cells ## Integration - Updated agent callbacks to include tool_id for tracking - Modified App to create and manage exec cells on tool events - Integrated exec cells into TUI layout between messages and input - Added spinner animation tick to event loop ## Testing - 6 insta snapshot tests for visual regression - 44 unit tests covering all ExecCell functionality: - ToolStatus states and transitions - Cell lifecycle (pending → running → success/error) - Output buffering and streaming - Duration formatting - Manager operations - Edge cases (empty results, multiline, complex JSON) ## Files Added - src/tui/components/exec_cell.rs (417 lines) - src/tui/components/mod.rs - tests/tui_exec_cell.rs (159 lines) - tests/exec_cell_unit.rs (365 lines) - tests/snapshots/*.snap (9 snapshot files) ## Files Modified - Cargo.toml (added insta dev dependency) - src/agent/types.rs (updated callback signatures) - src/agent/mod.rs (pass tool_id in callbacks) - src/orchestrate/child_agent.rs (fix callback signatures) - src/tui/mod.rs (export components module) - src/tui/app.rs (add exec_cells field and event handlers) - src/tui/ui.rs (render exec cells in layout) All 500+ tests pass ✓
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