[EPIC] Implement Preset Load Functionality

[SeamusMullan]

Add ability to load presets from file system.

Objectives

• Add "Load Preset" button
• Show dialog with available presets
• Load configuration from XML
• Apply configuration to all tabs

Linked Tasks

• Add "Load Preset" to Tab 1 (Define)
• Create preset selection dialog
• Implement XML deserialization
• Apply configuration to tabs
• Validate loaded configuration

Success Criteria

• Dialog shows available presets
• Presets load correctly
• All tabs update with loaded config
• Validation catches invalid presets

Timeline

• Start: 2026-04-29
• End: 2026-05-04
• Duration: 6 days