Max-style bluetooth slot handling

[kareltucek]

Changelog:

• Assign newly paired bluetooth connections into regular host slots.
• Don't unpair unknown devices upon config saves.
• Show bluetooth relevant events on the oled screen.
• If native switch connection action is held for 3 seconds, unpair the connection and free its slot for other devices.
• Add unpairHost macro command.
• For unpairHost and switchHost, allow numeric slot ids.

[Copilot]

Pull request overview

This PR implements "Max-style" Bluetooth slot handling to improve how the UHK manages Bluetooth device pairings. It allows newly paired devices to be assigned to regular host slots instead of a single generic slot, prevents unpairing of unknown devices during config saves, and adds the ability to unpair connections by holding the switch action for 3 seconds.

Key changes:

• Newly paired Bluetooth devices are allocated into regular host connection slots (Empty slots are used for unregistered devices)
• Long-press (3 seconds) on native switch connection actions unpairs the device and frees its slot
• New unpairHost macro command added with support for numeric slot IDs and connection names
• OLED notifications for Bluetooth-related events (pairing, unpairing, slot allocation)

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 16 comments.

Show a summary per file

File	Description
right/src/usb_report_updater.c	Adds long-press unpair functionality for switch host actions
right/src/host_connection.h	Adds new HostConnectionType_UnregisteredBtHid type and HostKnown enum, updates API signatures
right/src/host_connection.c	Implements slot allocation for unregistered devices, unpair logic, and connection name lookup
right/src/macros/commands.c	Adds unpairHost command with numeric slot and name support, adds numeric slot support to switchHost
right/src/macros/display.c	Adds UnNotify() function to hide notifications
right/src/macros/status_buffer.h	Declares UnNotify() function
device/src/keyboard/oled/widgets/widget_store.c	Updates target text display to handle unregistered BT HID connections
device/src/keyboard/oled/screens/notification_screen.*	Adds NotificationScreen_Hide() function
device/src/connections.h	Adds ConnectionType_UnusedUnregisteredHid enum value
device/src/connections.c	Updates Connections_MoveConnection to properly swap connections, adds allocation logic
device/src/usb/usb_compatibility.cpp	Removes ConnectionType_NewBtHid from switch cases, improves error message
device/src/bt_pair.h	Declares BtPair_AllocateUnregisteredBonds()
device/src/bt_pair.c	Adds bond allocation logic, marks old clear function as unused
device/src/bt_conn.c	Updates pairing flow to use new slot allocation, adds connection validation
right/src/usb_commands/usb_command_get_new_pairings.c	Updates to check for HostKnown_Registered specifically
right/src/config_parser/parse_config.c	Replaces bond clearing with bond allocation on config save
doc-dev/reference-manual.md	Documents new unpairHost command and numeric slot support

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