fix(output): treat / and \ as folder separators on any OS

Split folder templates on both separators and format each segment separately so sanitize_filename never rewrites the divider; validate folder.* templates per-segment.

unshackle/core/config.py

@@ -213,7 +213,11 @@ class Config:
                     warnings.warn(f"Unknown template variable '{var}' in {template_type} template")
 
             test_template = re.sub(r"\{[^}]+\}", "TEST", template_str)
-            if re.search(unsafe_chars, test_template):
+            if template_type.startswith("folder"):
+                unsafe_segment = any(re.search(unsafe_chars, seg) for seg in re.split(r"[\\/]", test_template))
+            else:
+                unsafe_segment = bool(re.search(unsafe_chars, test_template))
+            if unsafe_segment:
                 warnings.warn(f"Template '{template_type}' may contain filesystem-unsafe characters")
 
             if not template_str.strip():

unshackle/core/titles/episode.py

@@ -102,15 +102,12 @@ class Episode(Title):
         if folder:
             template = config.get_folder_template("series")
             if template:
-                formatter = TemplateFormatter(template)
                 context = self._build_template_context(media_info, show_service)
                 context["season"] = f"S{self.season:02}"
-
-                folder_name = formatter.format(context)
-
-                separators = re.sub(r"\{[^}]*\}", "", template)
-                spacer = "." if "." in separators and " " not in separators else " "
-                return "/".join(sanitize_filename(p, spacer) for p in folder_name.split("/") if p)
+                segments = [
+                    TemplateFormatter(seg).format(context) for seg in re.split(r"[\\/]", template) if seg.strip()
+                ]
+                return "/".join(s for s in segments if s)
 
             series_template = config.output_template.get("series")
             if series_template:

unshackle/core/titles/movie.py

@@ -62,13 +62,11 @@ class Movie(Title):
         if folder:
             template = config.get_folder_template("movies")
             if template:
-                formatter = TemplateFormatter(template)
                 context = self._build_template_context(media_info, show_service)
-                folder_name = formatter.format(context)
-
-                separators = re.sub(r"\{[^}]*\}", "", template)
-                spacer = "." if "." in separators and " " not in separators else " "
-                return "/".join(sanitize_filename(p, spacer) for p in folder_name.split("/") if p)
+                segments = [
+                    TemplateFormatter(seg).format(context) for seg in re.split(r"[\\/]", template) if seg.strip()
+                ]
+                return "/".join(s for s in segments if s)
             name = f"{self.name}"
             if self.year:
                 name += f" ({self.year})"

unshackle/core/titles/music.py

@@ -170,13 +170,11 @@ class Song(Title):
             # legacy "songs" folder template, then to "{artist} - {album} ({year})".
             template = config.get_folder_template("albums") or config.get_folder_template("songs")
             if template:
-                formatter = TemplateFormatter(template)
                 context = self._build_template_context(media_info, show_service)
-                folder_name = formatter.format(context)
-
-                separators = re.sub(r"\{[^}]*\}", "", template)
-                spacer = "." if "." in separators and " " not in separators else " "
-                return sanitize_filename(folder_name, spacer)
+                segments = [
+                    TemplateFormatter(seg).format(context) for seg in re.split(r"[\\/]", template) if seg.strip()
+                ]
+                return "/".join(s for s in segments if s)
             name = f"{self.artist} - {self.album}"
             if self.year:
                 name += f" ({self.year})"

unshackle/core/titles/song.py

@@ -97,13 +97,11 @@ class Song(Title):
         if folder:
             template = config.get_folder_template("songs")
             if template:
-                formatter = TemplateFormatter(template)
                 context = self._build_template_context(media_info, show_service)
-                folder_name = formatter.format(context)
-
-                separators = re.sub(r"\{[^}]*\}", "", template)
-                spacer = "." if "." in separators and " " not in separators else " "
-                return "/".join(sanitize_filename(p, spacer) for p in folder_name.split("/") if p)
+                segments = [
+                    TemplateFormatter(seg).format(context) for seg in re.split(r"[\\/]", template) if seg.strip()
+                ]
+                return "/".join(s for s in segments if s)
             name = f"{self.artist} - {self.album}"
             if self.year:
                 name += f" ({self.year})"