fix(tip20): address rewards review comments

[decofe]

Addresses review comments on #4161.\n\nChanges:\n- Rename packed balance storage type to TIP20UserState.\n- Replace boolean opted-in supply updater with explicit increase/decrease helpers.\n- Simplify reward updates to avoid cached storage-read arguments.\n- Rename RewardFlag constructor to from_delegate and use old_flag/new_flag naming.\n- Checkpoint reward_per_token when opting into T6 rewards.\n\nValidation:\n- cargo check -p tempo-precompiles\n- cargo test -p tempo-precompiles tip20::rewards

[github-actions]

📊 Tempo Precompiles Coverage

precompiles

Coverage: 5642/8434 lines (66.90%)

File details

File	Lines	Coverage
src/account_keychain/dispatch.rs	35/94	37.23%
src/account_keychain/mod.rs	279/785	35.54%
src/address_registry/dispatch.rs	31/36	86.11%
src/address_registry/mod.rs	50/60	83.33%
src/error.rs	39/117	33.33%
src/ip_validation.rs	10/10	100.00%
src/lib.rs	182/221	82.35%
src/nonce/dispatch.rs	9/10	90.00%
src/nonce/mod.rs	42/57	73.68%
src/signature_verifier/dispatch.rs	19/20	95.00%
src/signature_verifier/mod.rs	13/17	76.47%
src/stablecoin_dex/dispatch.rs	92/93	98.92%
src/stablecoin_dex/mod.rs	862/938	91.90%
src/stablecoin_dex/order.rs	120/154	77.92%
src/stablecoin_dex/orderbook.rs	157/216	72.69%
src/storage/evm.rs	192/221	86.88%
src/storage/hashmap.rs	0/158	0.00%
src/storage/mod.rs	27/27	100.00%
src/storage/packing.rs	68/93	73.12%
src/storage/thread_local.rs	165/227	72.69%
src/storage/types/array.rs	0/72	0.00%
src/storage/types/bytes_like.rs	139/183	75.96%
src/storage/types/mapping.rs	27/48	56.25%
src/storage/types/mod.rs	70/97	72.16%
src/storage/types/primitives.rs	21/24	87.50%
src/storage/types/set.rs	28/192	14.58%
src/storage/types/slot.rs	52/81	64.20%
src/storage/types/vec.rs	103/261	39.46%
src/tip20/dispatch.rs	157/173	90.75%
src/tip20/mod.rs	624/729	85.60%
src/tip20/rewards.rs	225/289	77.85%
src/tip20/roles.rs	85/88	96.59%
src/tip20_channel_reserve/dispatch.rs	0/51	0.00%
src/tip20_channel_reserve/mod.rs	3/464	0.65%
src/tip20_factory/dispatch.rs	20/21	95.24%
src/tip20_factory/mod.rs	117/140	83.57%
src/tip403_registry/dispatch.rs	55/56	98.21%
src/tip403_registry/mod.rs	302/346	87.28%
src/tip_fee_manager/amm.rs	281/392	71.68%
src/tip_fee_manager/dispatch.rs	81/83	97.59%
src/tip_fee_manager/mod.rs	57/157	36.31%
src/validator_config/dispatch.rs	38/52	73.08%
src/validator_config/mod.rs	171/227	75.33%
src/validator_config_v2/dispatch.rs	71/73	97.26%
src/validator_config_v2/mod.rs	523/581	90.02%

contracts

Coverage: 1/48 lines (2.08%)

File details

File	Lines	Coverage
src/lib.rs	1/1	100.00%
src/precompiles/tip20.rs	0/19	0.00%
src/precompiles/tip20_channel_reserve.rs	0/16	0.00%
src/precompiles/tip403_registry.rs	0/9	0.00%
src/precompiles/validator_config_v2.rs	0/3	0.00%

Total: 5643/8482 lines (66.53%)

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