feat: Filament Track Switch (H2-series O2L-FTS) support

The Filament Track Switch (H2-series accessory, product code O2L-FTS) feeds
every AMS to both extruders through a two-track switch. Port full support
across the device layer, project config, and GUI.

Device / config:
- Model the switch-aware AMS binding (the set of extruders an AMS can feed
  and which input track A/B feeds it), switch readiness, the O2L-FTS firmware
  module, and the fun2 capability bit for checking a slice against installed
  hardware.
- Register has_filament_switcher and enable_filament_dynamic_map as project
  config that persists with the project and restores from a saved 3mf, and
  force both back to false on every project/printer/CLI load path. Live
  device sync is the only thing that sets them true.

GUI:
- Sidebar sync activates the switch from live device state, attributes each
  AMS to the extruder its input track feeds, shows a floating status icon
  (ready / not-calibrated), and surfaces a one-time tip / not-calibrated
  warning.
- Send dialog gains a non-blocking slice-vs-hardware mismatch warning and a
  blocking error when a slice needs dynamic nozzle mapping but the switch is
  missing or not set up.
- AMS load/unload guards, AMS-view routing glyph + un-calibrated banner +
  hidden external-spool road, and mapping-popup external-spool lockout.
- Filament pickers collapse the per-extruder split into a single deduplicated
  "AMS filaments" group with a smart-assign toggle when the switch is ready.
- Firmware-upgrade panel lists the O2L-FTS accessory and its version.
- Device-provided filament-change steps (ams.cfs) drive the change-step
  display when firmware sends them, including the three switch steps.
- "Load current filament" asks which extruder to feed via a
  FeedDirectionDialog when the switch is calibrated.

Inert without the accessory: every path is gated on the switch being
installed (MQTT aux bit 29, default off) or ready, both project flags default
false, and the per-extruder AMS attribution is byte-identical, so AMS state,
the send/load UI, and sliced g-code are unchanged for every printer that does
not report a Filament Track Switch.

localization/i18n/OrcaSlicer.pot

@@ -18656,3 +18656,69 @@ msgstr ""
 #, possible-c-format, possible-boost-format
 msgid "The current nozzle mapping may produce an extra %0.2f g of waste."
 msgstr ""
+
+msgid ""
+"Filament switcher detected. All AMS filaments are now available for both "
+"extruders. The slicer will auto-assign for optimal printing. "
+msgstr ""
+
+msgid ""
+"A filament switcher is detected but not calibrated and thus currently "
+"unavailable. Please calibrate it on the printer and synchronize before use. "
+msgstr ""
+
+msgid ""
+"The Filament Track Switch installed on the printer does not match the slicing "
+"file. Please re-slice to avoid print quality issues."
+msgstr ""
+
+msgid "This print requires a Filament Track Switch. Please install it first."
+msgstr ""
+
+msgid "The Filament Track Switch has not been setup. Please setup it first."
+msgstr ""
+
+msgid "\"Load\" or \"Unload\" is not supported for external spool while using Filament Track Switch."
+msgstr ""
+
+msgid "The Filament Track Switch has not been setup. Please setup on printer."
+msgstr ""
+
+msgid "Load %s to "
+msgstr ""
+
+msgid "AMS filaments"
+msgstr ""
+
+msgid "Fila Saving"
+msgstr ""
+
+msgid "Enable smart filament assign: Assign one filament to multiple nozzles to maximize savings"
+msgstr ""
+
+msgid "Filament Track Switch"
+msgstr ""
+
+msgid "AMS has not been initialized. Please initialize it before use."
+msgstr ""
+
+msgid "External spools is not supported since Filament Track Switch has been installed. If you want to use external spool, please uninstall it."
+msgstr ""
+
+msgid "Switch"
+msgstr ""
+
+msgid "hotend"
+msgstr ""
+
+msgid "Wait for AMS cooling"
+msgstr ""
+
+msgid "Switch current filament at Filament Track Switch"
+msgstr ""
+
+msgid "Pull back current filament at Filament Track Switch"
+msgstr ""
+
+msgid "Switch track at Filament Track Switch"
+msgstr ""