fix(stablecoin-dex): return error on sub_balance underflow instead of silently clamping to zero

[fgimenez]

Closes CHAIN-797

[github-actions]

📊 Tempo Precompiles Coverage

precompiles

Coverage: 20140/21165 lines (95.16%)

File details

File	Lines	Coverage
src/account_keychain/dispatch.rs	36/41	87.80%
src/account_keychain/mod.rs	1131/1150	98.35%
src/error.rs	139/158	87.97%
src/ip_validation.rs	10/10	100.00%
src/lib.rs	328/339	96.76%
src/nonce/dispatch.rs	19/23	82.61%
src/nonce/mod.rs	252/260	96.92%
src/stablecoin_dex/dispatch.rs	349/353	98.87%
src/stablecoin_dex/error.rs	51/51	100.00%
src/stablecoin_dex/mod.rs	2876/2974	96.70%
src/stablecoin_dex/order.rs	362/362	100.00%
src/stablecoin_dex/orderbook.rs	651/683	95.31%
src/storage/evm.rs	321/347	92.51%
src/storage/hashmap.rs	128/140	91.43%
src/storage/mod.rs	5/5	100.00%
src/storage/packing.rs	526/552	95.29%
src/storage/thread_local.rs	146/195	74.87%
src/storage/types/array.rs	211/262	80.53%
src/storage/types/bytes_like.rs	323/338	95.56%
src/storage/types/mapping.rs	148/148	100.00%
src/storage/types/mod.rs	67/91	73.63%
src/storage/types/primitives.rs	564/567	99.47%
src/storage/types/set.rs	454/474	95.78%
src/storage/types/slot.rs	282/296	95.27%
src/storage/types/vec.rs	1078/1095	98.45%
src/test_util.rs	194/231	83.98%
src/tip20/dispatch.rs	534/563	94.85%
src/tip20/mod.rs	1341/1408	95.24%
src/tip20/rewards.rs	444/487	91.17%
src/tip20/roles.rs	187/206	90.78%
src/tip20_factory/dispatch.rs	26/29	89.66%
src/tip20_factory/mod.rs	543/555	97.84%
src/tip403_registry/dispatch.rs	406/443	91.65%
src/tip403_registry/mod.rs	1338/1423	94.03%
src/tip_fee_manager/amm.rs	1111/1147	96.86%
src/tip_fee_manager/dispatch.rs	278/289	96.19%
src/tip_fee_manager/mod.rs	495/510	97.06%
src/validator_config/dispatch.rs	210/221	95.02%
src/validator_config/mod.rs	604/658	91.79%
src/validator_config_v2/dispatch.rs	201/214	93.93%
src/validator_config_v2/mod.rs	1771/1867	94.86%

contracts

Coverage: 200/377 lines (53.05%)

File details

File	Lines	Coverage
src/lib.rs	1/71	1.41%
src/precompiles/account_keychain.rs	24/30	80.00%
src/precompiles/nonce.rs	9/18	50.00%
src/precompiles/stablecoin_dex.rs	33/48	68.75%
src/precompiles/tip20.rs	46/64	71.88%
src/precompiles/tip20_factory.rs	6/12	50.00%
src/precompiles/tip403_registry.rs	12/15	80.00%
src/precompiles/tip_fee_manager.rs	21/45	46.67%
src/precompiles/validator_config.rs	12/26	46.15%
src/precompiles/validator_config_v2.rs	36/48	75.00%

Total: 20340/21542 lines (94.42%)

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