[WIP] Add hotel mode to hide UI elements

[Copilot]

Important Note: The problem statement mentions "Edit Quick Access icon", "All Apps", and "Settings" which appear to be Android launcher UI elements. However, this is MiniDexed - a bare-metal Raspberry Pi FM synthesizer with no Android components.

I will interpret and implement "Hotel Mode" for MiniDexed as follows:

• Understand the current button handling and menu system
• Add configuration storage for Hotel Mode state
• Implement 5-second "next button" (arrow-up) long-press detection
• Hide advanced menu items when Hotel Mode is active (e.g., "Edit Voice", "Effects", detailed settings)
• Persist Hotel Mode state across reboots in configuration file
• Test the implementation

Note: If this is not the correct interpretation, please clarify which specific menu items should be hidden in MiniDexed's menu system.

Original prompt

Add "Hotel Mode": When the user presses Arrow-up for 5 seconds, then the "Edit Quick Access" icon, "All Apps" and "Settings" are hidden from the user interface. This is persisted (saved) across app relaunches. To show all items again, the user needs to press Arrow-up for 5 seconds again.

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