Refactor test cases for improved readability and consistency

- Updated test functions in various test files to enhance code clarity by formatting long lines and improving indentation.
- Adjusted assertions to use multi-line formatting for better readability.
- Added new test cases for theme settings API to ensure proper functionality.
- Ensured consistent use of line breaks and spacing across test files for uniformity.

tests/e2e/conftest.py

@@ -4,6 +4,7 @@ import time
 from typing import Dict, Generator
 
 import pytest
+
 # type: ignore[import]
 from playwright.sync_api import Browser, Page, Playwright, sync_playwright
 
@@ -70,10 +71,17 @@ def seed_default_currencies(live_server: str) -> None:
 
     seeds = [
         {"code": "EUR", "name": "Euro", "symbol": "EUR", "is_active": True},
-        {"code": "CLP", "name": "Chilean Peso", "symbol": "CLP$", "is_active": True},
+        {
+            "code": "CLP",
+            "name": "Chilean Peso",
+            "symbol": "CLP$",
+            "is_active": True,
+        },
     ]
 
-    with httpx.Client(base_url=live_server, timeout=5.0, trust_env=False) as client:
+    with httpx.Client(
+        base_url=live_server, timeout=5.0, trust_env=False
+    ) as client:
         try:
             response = client.get("/api/currencies/?include_inactive=true")
             response.raise_for_status()
@@ -128,8 +136,12 @@ def page(browser: Browser, live_server: str) -> Generator[Page, None, None]:
 def _prepare_database_environment(env: Dict[str, str]) -> Dict[str, str]:
     """Ensure granular database env vars are available for the app under test."""
 
-    required = ("DATABASE_HOST", "DATABASE_USER",
-                "DATABASE_NAME", "DATABASE_PASSWORD")
+    required = (
+        "DATABASE_HOST",
+        "DATABASE_USER",
+        "DATABASE_NAME",
+        "DATABASE_PASSWORD",
+    )
     if all(env.get(key) for key in required):
         return env