[BUG] Reader dashboard missing pagination on donation query

[realproject7]

Problem

PR #63 (Reader Dashboard) queries donations without .limit(). If a user has 1000+ donations, this will:

• Fetch all rows into browser memory
• Render all DOM nodes
• Cause performance degradation
• Risk hitting Supabase rate limits

The total aggregation (reduce over all results) also depends on the full fetch, so adding a limit later will make the total inaccurate unless computed server-side.

Fix

• Add .limit(50) (or similar) to the donation query
• Add "load more" or pagination indicator if limit reached
• Move total donation aggregation to a Supabase RPC or computed column, OR accept that total only reflects displayed page
• npm run lint and npm run typecheck pass