WIP: Add light/dark theme with toggle in navbar (dark theme styling incomplete - dont care for now)

routes/settings.py

@@ -62,3 +62,15 @@ def delete_api_key(key_id):
     user_id = current_user.id
     db.delete_api_key(user_id, key_id)
     return "", 200
+
+@settings.route("/theme", methods=["POST"])
+@login_required
+def toggle_theme():
+    user_id = current_user.id
+    theme = request.form.get("theme")
+    if theme in ['light', 'dark']:
+        db.update_user_theme_preference(user_id, theme)
+        # Return empty string as we'll handle the UI update via client-side JS or just let the class toggle persist
+        # Actually, for HTMX we might want to return something or just 200 OK.
+        return "", 200
+    return "Invalid theme", 400