Fix Questions.vue crash when DataSize is not loaded

[rahul810050]

Fixed issue: #19

PR Summary

This PR fixes a runtime crash in Questions.vue caused by accessing
getDataSize.questions.general before the Firestore DataSize document
is fully loaded.

Root cause

• getDataSize is loaded asynchronously
• Questions.vue accessed nested properties during render and mounted()
• This resulted in TypeError: Cannot read properties of null

Solution

• Added defensive guards to the pageAmount computed property
• Introduced a hasDataSize reactive guard
• Deferred the initial page load using a watcher instead of mounted()

Why this approach

• Prevents race conditions between Firestore and Vue lifecycle
• Matches existing fixes applied to Tests.vue and DataAmount.vue
• Keeps store logic unchanged
• Fully compatible with Vue 2 and Vuex

Affected files

• src/components/Questions/Questions.vue

Result

• Questions page no longer crashes on initial load
• Pagination renders correctly
• Page data loads only when DataSize is ready

Before:

After:

Fixed another issue :

Problem:

• it shows no questions even if you have questions---it only shows when you filter it

after changes:

• the question page will show all the questions it has..and the filter works fine as before