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.

services/settings.py

@@ -7,6 +7,7 @@ from typing import Dict, Mapping
 from sqlalchemy.orm import Session
 
 from models.application_setting import ApplicationSetting
+from models.theme_setting import ThemeSetting  # Import ThemeSetting model
 
 CSS_COLOR_CATEGORY = "theme"
 CSS_COLOR_VALUE_TYPE = "color"
@@ -92,7 +93,9 @@ def get_css_color_settings(db: Session) -> Dict[str, str]:
     return values
 
 
-def update_css_color_settings(db: Session, updates: Mapping[str, str]) -> Dict[str, str]:
+def update_css_color_settings(
+    db: Session, updates: Mapping[str, str]
+) -> Dict[str, str]:
     """Persist provided CSS color overrides and return the final values."""
 
     if not updates:
@@ -176,8 +179,10 @@ def _validate_functional_color(value: str) -> None:
 
 def _ensure_component_count(value: str, expected: int) -> None:
     if not value.endswith(")"):
-        raise ValueError("Color function expressions must end with a closing parenthesis")
-    inner = value[value.index("(") + 1 : -1]
+        raise ValueError(
+            "Color function expressions must end with a closing parenthesis"
+        )
+    inner = value[value.index("(") + 1: -1]
     parts = [segment.strip() for segment in inner.split(",")]
     if len(parts) != expected:
         raise ValueError(
@@ -206,3 +211,20 @@ def list_css_env_override_rows(
             }
         )
     return rows
+
+
+def save_theme_settings(db: Session, theme_data: dict):
+    theme = db.query(ThemeSetting).first() or ThemeSetting()
+    for key, value in theme_data.items():
+        setattr(theme, key, value)
+    db.add(theme)
+    db.commit()
+    db.refresh(theme)
+    return theme
+
+
+def get_theme_settings(db: Session):
+    theme = db.query(ThemeSetting).first()
+    if theme:
+        return {c.name: getattr(theme, c.name) for c in theme.__table__.columns}
+    return {}