fix(configurator): unify confirmation ownership and split app modules

[devmobasa]

Summary

• Represent Defaults Reset and Session Clear as one typed pending confirmation, ensuring only one destructive action can be armed at a time.
• Make confirmation replacement, cancellation, reload invalidation, and Escape handling consistent across both flows.
• Preserve newer status feedback when canceling an older confirmation.
• Restore keyboard focus after Session Clear is confirmed or canceled.
• Add regression coverage for ownership, stale events, missing sessions, status preservation, and focus handoff.
• Split oversized configurator pages, update handlers, and component wiring into focused modules.
• Replace production use super::* imports with explicit module dependencies.

Structure

The refactor separates:

• Session catalog, cards, settings, and tests
• UI settings sections
• Drawing settings sections
• Daemon controls and status
• Boards and render-profile sections
• Preset rows and color handling
• Configuration load, save, migration, defaults, status, and tests
• Drawing/UI field updates
• Component shell, view, and effects wiring

These are structural moves intended to preserve existing behavior outside the confirmation fixes.