Merge origin/main into feature/protobuf_config_and_dynamic_ui

Resolve the 4 proto-refactored conflicts (Preset.cpp, Print.cpp,
PrintConfig.cpp, Tab.cpp) by keeping the branch's generated-include
versions; auto-merged non-conflict changes from main are preserved.

Reconcile main's new settings into the proto schema. main added 52 new
active init_fff_params settings not present in the proto; ported them all
(type/label/tooltip/default/enum/preset) into print/filament/printer.proto
so the config registers, profiles load, and the GUI does not crash on
missing defs. Added GuiType.plugin_picker to config_metadata.proto and
regenerated config_metadata_pb2.py.

Codegen: run_codegen validate PASSED (712 fields). UI layout (layout.yaml
placement) for the 52 new settings is a follow-up; they are registered and
serialized but not yet placed in GUI tabs.

scripts/flatpak/com.orcaslicer.OrcaSlicer.yml

@@ -161,6 +161,12 @@ modules:
       - /include
       - "*.a"
       - "*.la"
+      # CPython headers: useless at runtime (no compiler in the runtime
+      # sandbox, so C-extension source builds can't happen anyway), and a
+      # few MB of bloat. /app/libpython is installed by this module, so the
+      # entry must live in THIS module's cleanup (module-level cleanup only
+      # matches files the module itself installed).
+      - /libpython/include
 
     sources:
       # OrcaSlicer deps/ directory (avoids copying .git from worktree)
@@ -294,6 +300,18 @@ modules:
         sha256: 1ec1cba65f9f20fe5a41fda1586e01c70ea0c9a6d7b67c9e13edf0cfe2239277
         dest: external-packages/OpenCV
 
+      # CPython 3.12.13
+      - type: file
+        url: https://www.python.org/ftp/python/3.12.13/Python-3.12.13.tar.xz
+        sha256: c08bc65a81971c1dd5783182826503369466c7e67374d1646519adf05207b684
+        dest: external-packages/python3
+
+      # wxInspector 1.0.0
+      - type: file
+        url: https://github.com/Noisyfox/wxInspector/archive/refs/tags/v1.0.0.zip
+        sha256: 0ba163956f2d468b19a91b96c5aba66ee9610843ea41dda628ea44cdafde7db7
+        dest: external-packages/wxInspector
+
       # ---------------------------------------------------------------
       # Fallback archives for deps normally provided by the GNOME SDK.
       # These are only used if find_package() fails to locate them.