Merge Main into Belt Printer

Merge origin/main (00429da739) into belt-printer.

Conflicts resolved:
- src/CMakeLists.txt: keep both wxInspector workarounds.
- GCodeProcessor.cpp: keep the belt compare_pos / z_for_height lines.
- PrintObjectSlice.cpp: the belt bbox-Z guard also covers main's
  printable_region_ids bookkeeping.
- TreeSupport.cpp: the belt-floor check runs before main's PendingNode
  queueing.
- Tab.hpp: keep the belt fields, drop the removed upload description
  fields.
- tests/libslic3r/CMakeLists.txt: keep both test files.

Also included:
- eSUN PLA belt presets declare their own filament_id (OFkrxQC4) and
  scripts/filament_id_snapshot.json is regenerated, as main's filament_id
  check requires.
- Custom.json version bumped to 02.04.00.05 so the belt entries reach
  existing installs.
- Fix the ambiguous WithinRel call in the belt apron width test, which
  otherwise breaks the fff_print build.

src/libslic3r/GCode.cpp

@@ -6688,8 +6688,13 @@ LayerResult GCode::process_layer(
                                 all_label_ids.insert(inst.label_object_id);
                         break;
                     }
-            std::vector<size_t> filament_instances_id(all_label_ids.begin(), all_label_ids.end());
-            m_filament_instances_code = _encode_label_ids_to_base64(filament_instances_id);
+            // Orca: A scheduled extruder may have no object instances on this layer.
+            // Clear any pending mask so it cannot be emitted for the wrong toolchange.
+            m_filament_instances_code.clear();
+            if (!all_label_ids.empty()) {
+                std::vector<size_t> filament_instances_id(all_label_ids.begin(), all_label_ids.end());
+                m_filament_instances_code = _encode_label_ids_to_base64(filament_instances_id);
+            }
         }
 
         // The inline _extrude hook may already have taken the snapshot mid-extrusion on a
@@ -8664,9 +8669,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
             }
             variable_speed = std::any_of(new_points.begin(), new_points.end(),
                                          [speed](const ProcessedPoint &p) { return fabs(double(p.speed) - speed) > 1; }); // Ignore small speed variations (under 1mm/sec)
-            if (!NOZZLE_CONFIG(enable_overhang_speed) && FILAMENT_CONFIG(enable_overhang_bridge_fan) && m_enable_cooling_markers) {
-                for (ProcessedPoint &point : new_points)
-                    point.speed = speed;
+            if (FILAMENT_CONFIG(enable_overhang_bridge_fan) && m_enable_cooling_markers) {
+                if (!NOZZLE_CONFIG(enable_overhang_speed))
+                    for (ProcessedPoint &point : new_points)
+                        point.speed = speed;
                 variable_speed = new_points.size() > 1;
             }
     }