Removed random comments and replaced em-dashes with hyphens.

Backend/Preview.py

@@ -20,7 +20,6 @@ MimeTypeMap = {
 
 
 def ReadTextFile(FilePath: Path) -> str:
-    """Read a text-classified file as UTF-8."""
     return FilePath.read_text(encoding="utf-8")
 
 
@@ -33,7 +32,6 @@ def GetMimeType(FilePath: Path) -> str:
 
 
 def ParseRangeHeader(RangeHeader: str, FileSize: int) -> tuple[int, int]:
-    """Parse a single-range HTTP Range header into an inclusive (Start, End)."""
     RangeValue = RangeHeader.replace("bytes=", "").strip()
     StartText, _, EndText = RangeValue.partition("-")