Remove radio settings restart flow once SX1262 live-update lands in core

[zindello]

Summary

The Radio Settings configuration tab currently requires a restart to apply changes. Once the SX1262 configure_radio live-update change is merged into pyMC_core (PR #81), the restart flow should be removed from the UI.

Dependency

• pyMC_core PR Feat/neighbour links #81 — configure_radio setter support for SX1262 (live parameter update without restart)
• USB radio setter stubs are tracked in pyMC_core issue Feat/neighbour links #82 — that follow-on may also affect this

Work required

• Remove the restart prompt / confirmation flow from the Radio Settings tab
• Remove any restart-related UI (button, warning banner, or modal) that exists solely for this purpose
• Verify the save action calls the new setter directly and reflects the updated value without a device restart

Notes

Do not remove the restart flow until pyMC_core PR #81 is merged and the firmware is available for testing. This issue exists as a reminder to clean up the UI debt once the core dependency is resolved.