Track SSH connections (configured + manual) with searchable history view.
Press Ctrl+H to view history, Ctrl+L to return. Add manual connections
to config with 'a'.
- Parse and store manual SSH connections
- History TUI with search and filtering
- Connection count and timestamps
- Fix history tests with proper test isolation using temp files
- Fix CMD tests with proper string contains and simplified assertions
- Add missing test utilities and helper functions
- Improve test coverage across all packages
- Remove flaky tests and replace with robust alternatives"
