fix(StdStorage): fix uint256 underflow infinite loop in find()

[decofe]

The reverse-iteration loop in find() uses for (uint256 i = reads.length; --i >= 0;) — since i is a uint256, --i >= 0 is always true. When i wraps past zero, the loop runs forever instead of terminating.

For tokens whose balanceOf reads multiple storage slots and returns a derived value (reflection tokens), checkSlotMutatesCall never finds a matching slot, and the loop never breaks — causing deal() to hang indefinitely.

Fix: for (uint256 i = reads.length; i > 0;) { --i; ... }

Additionally, caps the number of storage slots checked to 256 to prevent excessive RPC calls on contracts with complex storage access patterns.

Adds a regression test with a mock reflection token and a fork test with BabyDoge on BSC.

Closes #740
Closes #409

Co-Authored-By: DaniPopes 57450786+DaniPopes@users.noreply.github.com

Prompted by: DaniPopes