Fix DataAmount.vue crash when dataSize is partially loaded #15
Description
Description
The dashboard crashes during initial render when DataAmount.vue accesses
nested properties of dataSize (e.g. questions.general) before Firestore
data has fully loaded.
Although dataSize exists, some nested fields may still be undefined,
resulting in runtime errors such as:
TypeError: Cannot read properties of undefined (reading 'general')
This happens frequently on first page load or slow network conditions.
Expected Behavior
The dashboard should render safely while data is loading, without throwing
runtime errors.
Actual Behavior
The application crashes when nested fields of dataSize are accessed
before they are available.
Suggested Fix
Guard all accesses to nested dataSize properties using computed properties
with safe default values.
