fix: guard per-filament array reads against short config arrays (#14789)

* fix: guard H2C per-filament array reads against short config arrays

The H2C tool-ordering, wipe-tower, and g-code export paths index per-filament
config arrays by filament/tool id. A config with fewer entries than the filament
count (partial or legacy projects, minimal test configs) makes these reads run
past the end of the vector: silent under a normal STL, but UB that aborts under
the flatpak build's bounds-checked STL (_GLIBCXX_ASSERTIONS).

Route the reads through the existing clamping accessors (get_at,
get_filament_category, is_in_same_extruder) and add a small clamp helper for
filament_change_length. The guards are no-ops when the arrays are sized to the
filament count, so correctly specified configs are unaffected.

* fix: size the grouping context's filament_info to the filament count

build_filament_group_context built model_info.filament_info by walking
filament_type, so a config whose filament_type is shorter than the filament
count produced a short vector. FilamentGroup indexes filament_info by filament
id, so clamping the individual reads only moved the out-of-bounds access
downstream. Loop to filament_nums and read all three fields through get_at,
and drop filament_ids entries past the filament count, since the grouping code
pairs filament_ids and filament_info by position.

Adds a regression test with four filaments and one-entry filament_type /
filament_is_support. Without the fix it throws bad_alloc from copying a garbage
std::string read past the end.

* fix: guard the carousel nozzle-change length reads too

The carousel branch added in b90ac13d86/b0dddb4648 reads
m_filaments_change_length by tool id without a bounds check, the same
pattern this branch already routed through filament_change_length_at
a few lines above in both plan_toolchange and plan_tower_new.

* fix: guard WipeTower per-filament array reads against short config arrays

The BambuStudio WipeTower sync reintroduced raw per-filament array
indexing that reads out of bounds when a config leaves an array shorter
than the filament count: m_physical_extruder_map in format_line_M104/M109
(indexed even when empty), and m_filament_categories in get_wall_skip_points
and get_wall_filament_for_all_layer. Silent on a normal STL, a hard abort
under the bounds-checked STL the Flatpak build uses.

Bounds-check the physical extruder map before indexing (omitting the T
token, as the existing -1 path already does), and route the two raw
m_filament_categories reads through the clamping get_filament_category()
accessor the surrounding code already uses. No change for correctly-sized
configs.

src/libslic3r/GCode.cpp

@@ -3555,7 +3555,7 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
 
         auto used_filaments = print.get_slice_used_filaments(false);
         this->placeholder_parser().set("is_all_bbl_filament", std::all_of(used_filaments.begin(), used_filaments.end(), [&](auto idx) {
-            return m_config.filament_vendor.values[idx] == "Bambu Lab";
+            return m_config.filament_vendor.get_at(idx) == "Bambu Lab";
             }));
 
         //add during_print_exhaust_fan_speed
@@ -3572,7 +3572,7 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
         this->placeholder_parser().set("outer_wall_volumetric_speed", new ConfigOptionFloat(outer_wall_volumetric_speed));
 
         auto first_layer_filaments = print.get_slice_used_filaments(true);
-        bool has_tpu_in_first_layer = std::any_of(first_layer_filaments.begin(), first_layer_filaments.end(), [&](unsigned int idx) { return m_config.filament_type.values[idx] == "TPU"; });
+        bool has_tpu_in_first_layer = std::any_of(first_layer_filaments.begin(), first_layer_filaments.end(), [&](unsigned int idx) { return m_config.filament_type.get_at(idx) == "TPU"; });
         this->placeholder_parser().set("has_tpu_in_first_layer", new ConfigOptionBool(has_tpu_in_first_layer));
 
         if (print.calib_params().mode == CalibMode::Calib_PA_Line) {