Add multiple tmux panes to task detail view

[bborn]

Summary

This PR implements the ability to create multiple tmux panes (both shell and Claude) within a single task's detail view, allowing users to leverage the full power of tmux for parallel work.

Key Features

• New Keybindings:

  • Ctrl+N: Create a new shell pane
  • Ctrl+Shift+N: Create a new Claude pane

• Database Schema:

  • New task_panes table to track multiple panes per task
  • Support for pane types: claude, shell, claude-extra, shell-extra
  • Automatic cleanup via CASCADE on task deletion

• Pane Management:

  • All panes are tracked in the database
  • Automatic cleanup when leaving detail view
  • Panes are "broken" (not killed) so they can be manually reattached later

Implementation Details

1. Database Layer (internal/db/panes.go):

   • CRUD operations for task panes
   • Helper methods for getting primary panes
   • Sync function for backward compatibility

2. UI Layer (internal/ui/pane_manager.go):

   • Functions to create new shell and Claude panes
   • Cleanup logic for extra panes
   • Integration with existing tmux pane management

3. Tests (internal/db/panes_test.go):

   • Comprehensive test coverage for all pane operations
   • Tests for pane sync functionality

4. Documentation (docs/multiple-panes.md):

   • User guide for the feature
   • Technical details and use cases

Use Cases

• Run multiple shell sessions (dev server, git operations, log monitoring)
• Have multiple Claude instances working on different aspects of a task
• Leverage tmux layouts for better workspace organization

Backward Compatibility

The existing claude_pane_id and shell_pane_id columns remain for backward compatibility and track the primary panes.

Test Plan

• Unit tests for database operations pass
• Manual testing of pane creation and cleanup
• Verified keybindings work correctly
• Confirmed panes are properly broken on cleanup

🤖 Generated with Claude Code