[QA-Bug] Reader dashboard donation history shows $PLOT instead of WETH on testnet + excessive decimals

[realproject7]

Problem

Two issues in the reader dashboard donation history:

1. Wrong token label on testnet

• Shows "$PLOT" but should show "WETH" on Base Sepolia
• RESERVE_LABEL constant not used in this component
• PR [#154] Add receipt fetch retry to indexer routes #162 was supposed to fix this but missed the reader dashboard donation history

2. Excessive decimal precision

• Shows 0.00057715687791651 $PLOT — too many digits, hard to read
• Should truncate to 4-6 significant digits: 0.000577 WETH

Fix

1. Import RESERVE_LABEL from lib/contracts/constants and use instead of hardcoded "$PLOT"
2. Truncate formatUnits output to reasonable precision (6 decimal places max)

Files

• src/app/dashboard/reader/page.tsx (donation history section)