perf: speed up TypeScript integration fixtures

[dev-jodee]

Summary

• Speed up TypeScript integration fixtures by writing SPL mint and token account state directly through Surfpool account writes
• Keep SOL funding on regular RPC airdrops; only token fixture setup changes
• Keep the PR scoped to clients/typescript/test/setup.ts with no timing env, profiling helpers, or worker config changes

Test Plan

• just fmt-check
• pnpm --filter @subscriptions/client build (ran during just lint-check before existing webapp lint failures)
• PATH=/tmp/surfpool-v1.2.0:$PATH just test-client (52 tests passed, 9 files, 223.83s total)

Notes

• just lint-check currently fails on existing webapp/ lint errors from origin/main; not from this one-file speedup diff
• Prior CI client integration run was about 351s total; this full local run completed in 223.83s

[github-actions]

Compute Unit Report

Instruction	Samples	Min CUs	Max CUs	Avg CUs	Est Cost (Low) [SOL]	Est Cost (Med) [SOL]	Est Cost (High) [SOL]
cancel_subscription	11	1805	2129	2013	0.000005000	0.000005080	0.000006006
close_subscription_authority	7	1881	1916	1886	0.000005000	0.000005075	0.000005943
create_fixed_delegation	38	3619	12621	5229	0.000005001	0.000005209	0.000007614
create_plan	84	3540	12553	5114	0.000005001	0.000005204	0.000007557
create_recurring_delegation	27	3640	8145	5035	0.000005001	0.000005201	0.000007517
delete_plan	8	416	416	416	0.000005000	0.000005016	0.000005208
init_subscription_authority	142	7431	24351	12490	0.000005003	0.000005499	0.000011245
revoke_delegation	19	318	585	420	0.000005000	0.000005016	0.000005210
subscribe	21	6670	14194	8394	0.000005002	0.000005335	0.000009197
transfer_fixed	6	10097	14597	12596	0.000005003	0.000005503	0.000011298
transfer_recurring	17	10206	14794	11125	0.000005003	0.000005445	0.000010562
transfer_subscription	10	10441	16476	12130	0.000005003	0.000005485	0.000011065
update_plan	21	424	503	476	0.000005000	0.000005019	0.000005238

Generated: 2026-04-30