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.

src/slic3r/GUI/PresetComboBoxes.cpp

@@ -3,6 +3,8 @@
 #include <cstddef>
 #include <vector>
 #include <string>
+#include <set>
+#include <utility>
 #include <algorithm>
 #include <boost/algorithm/string.hpp>
 
@@ -510,8 +512,14 @@ bool PresetComboBox::add_ams_filaments(std::string selected, bool alias_name)
     bool selected_in_ams      = false;
     bool is_bbl_vendor_preset = m_preset_bundle->is_bbl_vendor();
     if (is_bbl_vendor_preset && !m_preset_bundle->filament_ams_list.empty()) {
+        // When a filament track switch is installed and calibrated, every AMS filament is reachable
+        // from both extruders, so present one deduplicated group instead of the Left/Right split.
+        bool fila_switch_ready = wxGetApp().sidebar().is_fila_switch_ready();
         bool dual_extruder   = (m_preset_bundle->filament_ams_list.begin()->first & 0x10000) == 0;
-        set_label_marker(Append(dual_extruder ? _L("Left filaments") : _L("AMS filament"), wxNullBitmap, DD_ITEM_STYLE_SPLIT_ITEM));
+        if (fila_switch_ready)
+            set_label_marker(Append(_L("AMS filaments"), wxNullBitmap, DD_ITEM_STYLE_SPLIT_ITEM));
+        else
+            set_label_marker(Append(dual_extruder ? _L("Left filaments") : _L("AMS filament"), wxNullBitmap, DD_ITEM_STYLE_SPLIT_ITEM));
         m_first_ams_filament = GetCount();
         auto &filaments      = m_collection->get_presets();
 
@@ -523,8 +531,12 @@ bool PresetComboBox::add_ams_filaments(std::string selected, bool alias_name)
                 icon_width = 32;
         }
 
+        // Deduplicate by (tray_name, filament_id) so a filament shared by both extruders is
+        // listed once when the switch is ready. Uses Orca's tray naming/lookup, not BBS's.
+        std::set<std::pair<std::string, std::string>> added_filaments;
+
         for (auto &entry : m_preset_bundle->filament_ams_list) {
-            if (dual_extruder && (entry.first & 0x10000)) {
+            if (!fila_switch_ready && dual_extruder && (entry.first & 0x10000)) {
                 dual_extruder = false;
                 set_label_marker(Append(_L("Right filaments"), wxNullBitmap, DD_ITEM_STYLE_SPLIT_ITEM));
             }
@@ -535,6 +547,13 @@ bool PresetComboBox::add_ams_filaments(std::string selected, bool alias_name)
                 BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(":  %1% 's filament_id is empty.") % name;
                 continue;
             }
+            if (fila_switch_ready) {
+                // skip the external spool and collapse duplicates shared across both extruders
+                if (name == "Ext")
+                    continue;
+                if (!added_filaments.insert(std::make_pair(name, filament_id)).second)
+                    continue;
+            }
             auto iter = std::find_if(filaments.begin(), filaments.end(),
                 [&filament_id, this](auto &f) { return f.is_compatible && m_collection->get_preset_base(f) == &f && f.filament_id == filament_id; });
             if (iter == filaments.end()) {