Sweep: Show a "nothing indexed" banner when first arriving at index page.

[sweep-ai[bot]]

Description

This pull request introduces several UI enhancements to the index page, aimed at improving user experience by providing clear feedback on the state of indexed URLs. It adds visual cues for loading, refreshing, and empty states of the URL index feed table.

Summary

• Introduced isTableLoading, isTableEmpty, and isTableRefreshing reactive variables to manage the UI state.
• Implemented a loading indicator that displays while the table is fetching data.
• Added an "Empty State Banner" that shows when there are no indexed URLs, with a prompt to index new documents.
• Enhanced the URL index feed table to hide when there are no results and show a refreshing indicator when data is being refreshed.
• Modified the status column to include a spinning icon indicating when the table is refreshing.
• These changes aim to make the index page more informative and user-friendly, especially for first-time users or when there are no indexed URLs.

Files modified:

• frontend/pages/index.vue

Fixes #38.

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