fix(ink-ui): add tool call display and improve visual stability

[laynepenney]

Summary

• Add addToolCall() and addToolResult() methods to InkUiController to display tool calls in the Ink UI
• Display tool results with line count, duration, and error status
• Fix visual stability by always showing the activity panel with minimum height padding
• Add comprehensive tests for Ink UI controller (11 tests)

Changes

File	Description
src/ui/ink/controller.ts	Add addToolCall() and addToolResult() methods
src/index.ts	Call new controller methods in onToolCall/onToolResult callbacks
src/ui/ink/app.tsx	Remove early return, add minimum height padding to activity panel
tests/ink-ui.test.ts	New test file with 11 tests

Test plan

• Build passes
• All 2026 tests pass
• Start codi --ui ink and ask it to read a file
• Verify tool call name and input shown
• Verify tool result shown after completion
• Verify activity panel maintains stable position

🤖 Generated with Claude Code

[laynepenney]

Self-Review

• ✅ Build passes
• ✅ All 2030 tests pass (15 new Ink UI tests)
• ✅ Renamed status variable to icon in addToolResult() for clarity
• ✅ Replaced while loop with immutable array construction for padding
• ✅ Added 4 edge case tests (empty tool name, 0ms duration, empty result, empty input)
• ✅ Verified tool call display format matches classic UI (📎 emoji)

Ready to merge.

[laynepenney]

Updated with Comprehensive Edge Case Tests

Added 40 more edge case tests (now 55 total):

Tool Call Messages (23 tests)

• Special characters in input
• Nested objects
• Unicode/emoji in results
• Whitespace-only results
• Very large durations
• Many newlines
• Null values in input
• Multiple rapid tool calls
• Boundary truncation cases

Status Updates (5 tests)

• Null values in status
• Empty activity detail
• Status preservation

Confirmation Queue (6 tests)

• Non-existent confirmation resolution
• Worker confirmation source
• Abort result
• Complex approval patterns
• Many queued confirmations

Message Streaming (6 tests)

• Unicode chunks
• Newlines in chunks
• Interleaved messages
• startAssistantMessage id uniqueness

Worker/Reader Events (6 tests)

• State updates
• Results
• Logs

Session Selection (4 tests)

• Request/resolve flow
• Cancellation
• Custom prompt
• Wrong id handling

Exit/Lifecycle (2 tests)

Message Types (5 tests)

Total: 2070 tests passing