style: drop redundant comments and apply formatting

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

backend/tests/__init__.py

@@ -13,7 +13,7 @@ TEST_DATABASE = "books_test"
 
 def _ensure_test_database() -> None:
     conn = psycopg2.connect(ADMIN_URL)
-    conn.autocommit = True  # CREATE DATABASE cannot run inside a transaction
+    conn.autocommit = True
     try:
         with conn.cursor() as cur:
             cur.execute(
@@ -28,6 +28,5 @@ def _ensure_test_database() -> None:
 
 
 _ensure_test_database()
-# Assigned, never defaulted: tests TRUNCATE tables, so they must not inherit a real DATABASE_URL.
 os.environ["DATABASE_URL"] = ADMIN_URL.rsplit("/", 1)[0] + "/" + TEST_DATABASE
 os.environ["PASSWORD_PEPPER"] = "test-pepper-0123456789abcdef0123456789abcdef"

backend/tests/support.py

@@ -5,7 +5,7 @@ import psycopg2
 
 from app import app
 
-HTTPS = "https://localhost"  # the session cookie is Secure
+HTTPS = "https://localhost"
 
 
 def db_execute(sql: str, params: tuple = ()) -> list[tuple]:

backend/tests/test_auth.py

@@ -70,7 +70,7 @@ class AuthTests(ApiTestCase):
 
     def test_login_is_case_insensitive_on_username(self):
         self.register("Alice")
-        self.client = app.test_client()  # fresh cookie jar: signed out
+        self.client = app.test_client()
         response = self.call(
             "POST",
             "/api/auth/login",
@@ -116,9 +116,7 @@ class AuthTests(ApiTestCase):
         self.register()
         token = self.session_token()
         self.assertEqual(self.call("POST", "/api/auth/logout").status_code, 204)
-        self.client.set_cookie(
-            "sid", token, domain="localhost", path="/api"
-        )  # replay the stolen cookie
+        self.client.set_cookie("sid", token, domain="localhost", path="/api")
         self.assertEqual(self.call("GET", "/api/auth/me").status_code, 401)
 
     def test_idle_session_expires(self):

backend/tests/test_books.py

@@ -17,7 +17,7 @@ class BookTests(ApiTestCase):
             (book["current_page"], book["total_pages"], book["status"]),
             (0, 412, "not_started"),
         )
-        self.assertIn("T", book["created_at"])  # ISO 8601
+        self.assertIn("T", book["created_at"])
 
     def test_create_trims_text(self):
         book = self.create_book(title="  Dune  ")

backend/tests/test_search.py

@@ -24,12 +24,10 @@ class SearchTests(ApiTestCase):
         self.assertEqual(self.titles("q=tolkien"), ["The Hobbit"])
 
     def test_wildcards_match_literally(self):
-        self.assertEqual(self.titles("q=100%25"), ["100% Pure"])  # %25 is "%"
-        self.assertEqual(self.titles("q=e_D"), ["100% Pure"])  # literal "_" in Jane_Doe
-        self.assertEqual(
-            self.titles("q=k_s"), []
-        )  # unescaped "_" would match "Back\\slash"
-        self.assertEqual(self.titles("q=k%5Cs"), ["1000 Pages"])  # %5C is "\"
+        self.assertEqual(self.titles("q=100%25"), ["100% Pure"])
+        self.assertEqual(self.titles("q=e_D"), ["100% Pure"])
+        self.assertEqual(self.titles("q=k_s"), [])
+        self.assertEqual(self.titles("q=k%5Cs"), ["1000 Pages"])
 
     def test_genre_filter_and_combination(self):
         self.assertEqual(