feat(convert): update CBR settings and fix input handling

- Renamed `data-testid` in `ConvertToCbrSettings` to `cbr-output-settings`
- Refined `onChange` handler in `ConvertToCbrSettings` to ensure valid numeric value
- Standardized quote style in `ConvertFromCbrSettings` imports

Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>

frontend/src/core/components/tools/convert/ConvertFromCbrSettings.tsx

@@ -1,5 +1,5 @@
 import { Stack, Text, Checkbox } from '@mantine/core';
-import { useTranslation } from "react-i18next";
+import { useTranslation } from 'react-i18next';
 import { ConvertParameters } from "@app/hooks/tools/convert/useConvertParameters";
 
 interface ConvertFromCbrSettingsProps {

frontend/src/core/components/tools/convert/ConvertToCbrSettings.tsx

@@ -16,17 +16,17 @@ const ConvertToCbrSettings = ({
   const { t } = useTranslation();
 
   return (
-    <Stack gap="sm" data-testid="cbr-output-options-section">
+    <Stack gap="sm" data-testid="cbr-output-settings">
       <Text size="sm" fw={500}>{t("convert.cbrOutputOptions", "PDF to CBR Options")}:</Text>
 
       <NumberInput
         data-testid="cbr-dpi-input"
         label={t("convert.cbrDpi", "DPI for image rendering")}
         value={parameters.pdfToCbrOptions.dpi}
-        onChange={(value) => onParameterChange('pdfToCbrOptions', {
-          ...parameters.pdfToCbrOptions,
-          dpi: typeof value === 'number' ? value : 150
-        })}
+        onChange={(val) =>
+          typeof val === 'number' &&
+          onParameterChange('pdfToCbrOptions', { ...parameters.pdfToCbrOptions, dpi: val })
+        }
         min={72}
         max={600}
         step={50}