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/WipeTower.cpp

@@ -1349,7 +1349,7 @@ public:
             // flavor it reaches understands, not the zero dwell the other flavors flush with.
             buffer += "M400\n";
         buffer += "M104";
-        if (target_extruder != -1)
+        if (target_extruder != -1 && target_extruder < int(m_physical_extruder_map.size()))
             buffer += (" T" + std::to_string(m_physical_extruder_map[target_extruder]));
         buffer += " S" + std::to_string(target_temp) + " N0"; // N0 means the gcode is generated by slicer
         if (!comment.empty()) buffer += " ;" + comment;
@@ -1361,7 +1361,7 @@ public:
     WipeTowerWriter &format_line_M109(int target_temp, int target_extruder, const std::string &comment = std::string())
     {
         std::string buffer = "M109";
-        if (target_extruder != -1)
+        if (target_extruder != -1 && target_extruder < int(m_physical_extruder_map.size()))
             buffer += (" T" + std::to_string(m_physical_extruder_map[target_extruder]));
         buffer += " S" + std::to_string(target_temp) + " N0"; // N0 means the gcode is generated by slicer
         if (!comment.empty()) buffer += " ;" + comment;
@@ -3309,7 +3309,7 @@ void WipeTower::get_wall_skip_points(const WipeTowerInfo &layer, int layer_id)
         if (!cur_block_depth.count(m_filpar[new_filament].category)) cur_block_depth[m_filpar[new_filament].category] = block->start_depth;
         process_depth = cur_block_depth[m_filpar[new_filament].category];
         if (is_need_ramming(new_filament, old_filament, layer_id)) {
-            if (m_filament_categories[new_filament] == m_filament_categories[old_filament])
+            if (get_filament_category(new_filament) == get_filament_category(old_filament))
                 process_depth += nozzle_change_depth;
             else {
                 if (!cur_block_depth.count(m_filpar[old_filament].category)) {
@@ -4783,7 +4783,7 @@ int WipeTower::get_wall_filament_for_all_layer()
     int filament_id    = -1;
     int filament_count = 0;
     for (auto iter = filament_counts.begin(); iter != filament_counts.end(); ++iter) {
-        if (m_filament_categories[iter->first] == selected_category && iter->second > filament_count) {
+        if (get_filament_category(iter->first) == selected_category && iter->second > filament_count) {
             filament_id    = iter->first;
             filament_count = iter->second;
         }