Major fixes and improvements to Bluetooth device management and menu navigation:
**Bluetooth Device Pairing**
- Fixed discovered devices not being saved as paired after connection
- Only save devices to NVS when successfully connected (not just discovered)
- Auto-pair discovered devices on successful A2DP connection
- Update device list to show paired status immediately after connection
**Critical Bug Fixes**
- Fixed dangling pointer crash in NVS request/response mechanism
- Was sending pointer to stack variable, now sends result value directly
- Prevents crash when connecting to Bluetooth devices
- Fixed use-after-free crash when clicking menu items after dynamic updates
- Menu context now properly synchronized after adding/removing items
- Prevents InstructionFetchError crashes in menu navigation
- Fixed memory exhaustion by reducing MAX_BT_DEVICES from 20 to 8
- Prevents heap allocation failures when populating device list
**Menu & UX Improvements**
- "Clear Paired" button now properly disconnects active connections
- "Clear Paired" button always visible when paired devices exist
- GUI updates immediately after clearing paired devices
- Paired devices marked with asterisk prefix (* Device Name)
- Removed redundant "(paired)" suffix text
- Long device names scroll smoothly when selected (3-second animation)
- Refresh button preserved during menu updates to prevent crashes
- Menu focus state properly maintained across all dynamic updates
**Technical Details**
- bt_add_discovered_device() no longer saves to NVS
- Added currentFocusIndex() calls after all menu modifications
- Improved clear_bt_device_list() to avoid deleting active buttons
- Added bt_disconnect_current_device() for clean disconnections
- Fixed NVS notification mechanism to avoid stack variable pointers
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Add Bluetooth device list management with discovery and pairing support
- Implement volume control with AVRC integration
- Add system event handling for GUI-to-Bluetooth communication
- Enhance menu system with device selection and volume control pages
- Improve memory management by making menu creation lazy
- Add proper event subscription between GUI and Bluetooth modules
- Update filter coefficient for improved audio clicking behavior
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
