PN532 configuration UI panel

[Gudsfile]

Context

Individual PN532 settings (board_profile, protocol, spi.*) are already editable via the generic Settings page. But there is no dedicated panel to:

• see the effective merged config (profile defaults + overrides combined)
• select a profile with visual context (defaults table)
• trigger a probe from the UI

The /sonos panel is the reference implementation.

Goal

Add a /pn532 page (new ui_pages/pn532.py) analogous to /sonos.

Panel: main page /pn532

• Current effective config card: profile name, protocol, resolved pins (reset / cs / irq) after merging profile defaults with overrides
• "Edit" button linking to /pn532/edit
• "Probe" action: connects to the PN532, shows firmware version and one tag read attempt (must handle hardware-unavailable gracefully)
• Navigation back to Settings / Library

Panel: edit page /pn532/edit

• Profile selector (waveshare_hat / hiletgo_v3 / custom) with defaults table shown as context
• Pin override fields for spi.reset, spi.cs, spi.irq with profile default shown as placeholder
• Save via POST /api/ui/pn532/edit
• Reset to profile defaults button

Settings page change

Add a "Configure PN532 🔌" shortcut button on the jukebox.reader.pn532.board_profile row, analogous to the existing "Manage Speakers 🔊" button for jukebox.player.sonos.selected_group.

Routes

• GET /api/ui/pn532
• GET /api/ui/pn532/edit
• POST /api/ui/pn532/edit
• POST /api/ui/pn532/reset (optional)

Out of scope

• Individual PN532 settings remain on the Settings page
• Probe is a bonus; the panel is useful without it