Fixed "Cannot read properties of undefined (reading 'toFixed')" errors in TimeBasedParameterDialog and DynamicsParameterDialog by adding nullish coalescing operators with default values to all parameter accesses. This prevents errors when loading presets that have partial parameter sets. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>