style: drop redundant comments and apply formatting

Frontend now uses double quotes and semicolons. No behaviour change.

backend/books.py

@@ -13,7 +13,7 @@ bp = Blueprint("books", __name__, url_prefix="/api")
 
 MAX_TEXT = 500
 MAX_PAGES = 100_000
-MAX_GENRE_ID = 32_767  # SMALLINT
+MAX_GENRE_ID = 32_767
 GENRE_ID_PATTERN = re.compile(r"[0-9]{1,5}")
 REQUIRED_FIELDS = ("title", "author", "genre_id", "total_pages")
 FIELDS = set(REQUIRED_FIELDS) | {"current_page"}
@@ -56,7 +56,6 @@ def to_json(row: dict) -> dict:
 
 
 def escape_like(term: str) -> str:
-    # Backslash is Postgres's default LIKE escape character.
     return term.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
 
 
@@ -147,7 +146,6 @@ def create_book():
     return jsonify(to_json(owned_book(row["id"]))), 201
 
 
-# int(max=...) keeps ids within Postgres INT range: larger values 404 instead of erroring in SQL.
 @bp.get("/books/<int(max=2147483647):book_id>")
 @login_required
 def get_book(book_id: int):