Hard-code more mime types

If I had a dollar for all the weird and wonderful ways Windows systems
can be broken, I'd be a very rich man.

https://forums.ankiweb.net/t/the-gear-icon-in-the-anki-interface-is-not-displaying-properly/66274

qt/aqt/mediasrv.py

@@ -170,13 +170,42 @@ def favicon() -> Response:
 
 def _mime_for_path(path: str) -> str:
     "Mime type for provided path/filename."
-    if path.endswith(".css"):
-        # some users may have invalid mime type in the Windows registry
-        return "text/css"
-    elif path.endswith(".js") or path.endswith(".mjs"):
-        return "application/javascript"
+
+    _, ext = os.path.splitext(path)
+    ext = ext.lower()
+
+    # Badly-behaved apps on Windows can alter the standard mime types in the registry, which can completely
+    # break Anki's UI. So we hard-code the most common extensions.
+    mime_types = {
+        ".css": "text/css",
+        ".js": "application/javascript",
+        ".mjs": "application/javascript",
+        ".html": "text/html",
+        ".htm": "text/html",
+        ".svg": "image/svg+xml",
+        ".png": "image/png",
+        ".jpg": "image/jpeg",
+        ".jpeg": "image/jpeg",
+        ".gif": "image/gif",
+        ".webp": "image/webp",
+        ".ico": "image/x-icon",
+        ".json": "application/json",
+        ".woff": "font/woff",
+        ".woff2": "font/woff2",
+        ".ttf": "font/ttf",
+        ".otf": "font/otf",
+        ".mp3": "audio/mpeg",
+        ".mp4": "video/mp4",
+        ".webm": "video/webm",
+        ".ogg": "audio/ogg",
+        ".pdf": "application/pdf",
+        ".txt": "text/plain",
+    }
+
+    if mime := mime_types.get(ext):
+        return mime
     else:
-        # autodetect
+        # fallback to mimetypes, which may consult the registry
         mime, _encoding = mimetypes.guess_type(path)
         return mime or "application/octet-stream"