fix(webp): finish extension centralization from pre-submission review

- build the video save-dialog filter from VIDEO_EXTENSIONS (_VIDEO_FILE_FILTER)
  instead of a hardcoded "Videos (*.mp4 *.mkv)" — the last filter that still
  drifted from the canonical set
- remove the now-dead file_types list (unused in both the fork and upstream;
  the PySide6 dialogs use the QFileDialog filter strings) and drop it from the
  centralization comment

modules/globals.py

@@ -6,7 +6,7 @@ from typing import List, Dict, Any
 ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
 WORKFLOW_DIR = os.path.join(ROOT_DIR, "workflow")
 
-# Canonical media extensions, defined once so file dialogs, file_types and
+# Canonical media extensions, defined once so the file dialogs and
 # has_image_extension never drift. GIF is intentionally excluded: OpenCV's
 # cv2.imread/imwrite (the only image I/O this app uses) cannot decode or
 # encode GIF on 4.10 or 4.11, so offering it would silently fail. WEBP works
@@ -14,11 +14,6 @@ WORKFLOW_DIR = os.path.join(ROOT_DIR, "workflow")
 IMAGE_EXTENSIONS = (".png", ".jpg", ".jpeg", ".bmp", ".webp")
 VIDEO_EXTENSIONS = (".mp4", ".mkv")
 
-file_types = [
-    ("Image", tuple(f"*{ext}" for ext in IMAGE_EXTENSIONS)),
-    ("Video", tuple(f"*{ext}" for ext in VIDEO_EXTENSIONS)),
-]
-
 # Face Mapping Data
 source_target_map: List[Dict[str, Any]] = [] # Stores detailed map for image/video processing
 simple_map: Dict[str, Any] = {}             # Stores simplified map (embeddings/faces) for live/simple mode

modules/ui.py

@@ -244,6 +244,9 @@ _IMAGE_FILE_FILTER = "Images (" + " ".join(
 _MEDIA_FILE_FILTER = "Media (" + " ".join(
     f"*{ext}" for ext in (*modules.globals.IMAGE_EXTENSIONS, *modules.globals.VIDEO_EXTENSIONS)
 ) + ")"
+_VIDEO_FILE_FILTER = "Videos (" + " ".join(
+    f"*{ext}" for ext in modules.globals.VIDEO_EXTENSIONS
+) + ")"
 
 
 # ─── image utilities ─────────────────────────────────────────────────────
@@ -900,7 +903,7 @@ class MainWindow(QMainWindow):
             path, _f = QFileDialog.getSaveFileName(
                 self, _("save video output file"),
                 os.path.join(_RECENT_OUTPUT_DIR or "", "output.mp4"),
-                "Videos (*.mp4 *.mkv)",
+                _VIDEO_FILE_FILTER,
             )
         else:
             return