v1.4.7 — 3D printer integration + Snapmaker live + rack schema migration

Major release introducing 3D printer management as a first-class feature
alongside the inventory:

  - "Printers" tab with drag-and-drop grid, 5 supported brands
    (Bambu Lab / Creality / Elegoo / FlashForge / Snapmaker), per-brand
    model catalog with photos, online/offline indicator via HTTP ping
  - Side card with editable connection / credentials, gear button →
    Printers Settings modal (add + edit), inline edit on every field
    with serverTimestamp updatedAt
  - Snapmaker U1 live integration over Moonraker WebSocket: WebRTC
    camera, live extruder + bed temperatures, filament data per slot
    with click-to-edit, active-print job card (slicer thumbnail +
    progress + state pill + layer counter), reconnect with backoff
  - Inline filament editor as a stacked bottom-sheet with 3 sub-screens
    (summary, two-column filament picker, 24+1 colour grid). Sub-type
    drives a select populated from data/id_aspect.json defaulting to
    "Basic" so SET_PRINT_FILAMENT_CONFIG is always sent with all 5
    expected args (firmware ignores the call when one is missing)
  - Custom colour picker uses an inline transparent <input type=color>
    overlaid on the slot so the OS-native picker anchors correctly to
    the click position instead of the top-left of the window
  - Debug-only request log with pause/resume, clear, and a JSON paste
    zone for hand-crafted Moonraker calls

Storage schema migration:

  - Spool inventory docs: rack_id / level / position top-level fields
    repackaged into a single nested rack: { id, level, position }
    object. Twin-aware (every write mirrors the location to the linked
    twin tag), schema-agnostic reads (normalizeRow + state.rows fallback
    keep the rack queries working through the migration window)
  - Generic migration UX (consent modal → progress modal → silent done
    state) reused from the v1.4.5 UID migration with new generic copy
    so future schema upgrades can plug in without rewording

Other:

  - Debug-mode now gates the developer-facing UI: the printer raw JSON,
    the Snapmaker request log, and the spool raw JSON only render when
    users/{uid}.Debug === true. Toggling the switch re-renders any open
    panel so the sections appear/disappear immediately.
  - ~80 new i18n keys × 9 locales (en, fr, de, es, it, pl, pt, pt-pt, zh)
  - Brand catalog data committed under data/printers/ + brand photos
    under assets/img/{bbl,cre,eleg,ffg,snap}_printers/. New SVG icons:
    icon_pause.svg, icon_printer.svg
  - id_brand.json: small catalog tweak (added CaiLab + Tinmorry,
    renamed Filforme casing)

Author: TigerTag-Project