60: Real daemon IPC for layout test commands

[meduzapat]

Task-Url: #60

• Manual Connection Toggle: Added a mode-driven "Connect" toggle to the top bar that adapts based on the environment (hidden in Portable, disabled in Local, enabled in Interactive).
• Isolated Testing Configuration: Configured the handler to build a temporary, isolated test config and a hidden __ledspicerui_test__ profile, keeping testing completely independent of standard profiles.
• Daemon Takeover & Clean Restore: Implemented a single-step discovery process that captures running daemon states. It gracefully stops the daemon via systemctl or SIGTERM, and safely restores it afterward using a detached launch (setsid) so it remains completely independent of the UI lifecycle.
• Targeted Hardware Testing: Implemented generic command sending where UI elements map directly to hardware actions. Strips now pack evenly into display cells, and interacting with a segment cleanly lights or clears the entire block.
• Context-Aware UI Controls: Restricted element testing so it is only available while actively connected, and automatically deactivates any active element if a disconnect occurs.
• Visual Transition Overlay: Integrated a modal, borderless busy dialog with an auto-starting spinner and label that pumps the main loop during the brief connection/disconnection window.
• Flashed Debug Feedback: Added a non persistent "Verbose UI Debugging" option in Settings that routes semantic test actions through a new, fast-fading Debug severity level.
• Terminal & UI Cleanups: Removed dead observers, silenced redundant console noise, and refined the spacing and margins of the Settings layout.

this also closes #63