feat(web): add multi-delegator developer tool frontend

[dev-jodee]

Summary

• New apps/web Next.js 16 app — a single-page developer tool for direct on-chain interaction with the multi-delegator program
• 13 instruction forms across DELEGATE, PLANS, and SUBSCRIPTIONS sidebar groups, each calling the corresponding @multidelegator/client builder
• Dark theme with @solana/design-system components, inline CSS variable styling, and monospace font — matching the rewards program dev tool pattern
• Proper @solana/kit TransactionSigner bridge over @solana/wallet-adapter-react, with sendAndConfirmTransactionFactory for confirmation, built-in tx state management, and recent transaction logging

Test Plan

• pnpm --filter @multidelegator/client build then cd apps/web && pnpm dev
• Connect a devnet wallet, set RPC to devnet
• Init a multi-delegate PDA and verify on explorer
• Create a fixed and recurring delegation, verify delegation PDAs
• Create a plan, subscribe, and transfer subscription payment

[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	6	1963	1963	1963	0.000005000	0.000005078	0.000005981
close_multi_delegate	2	1835	1835	1835	0.000005000	0.000005073	0.000005917
create_fixed_delegation	24	3557	11062	5168	0.000005001	0.000005206	0.000007584
create_plan	63	3523	11037	4883	0.000005001	0.000005195	0.000007441
create_recurring_delegation	17	3586	11086	5703	0.000005001	0.000005228	0.000007851
delete_plan	4	401	401	401	0.000005000	0.000005016	0.000005200
init_multi_delegate	92	5672	18117	9155	0.000005002	0.000005366	0.000009577
revoke_delegation	7	271	422	297	0.000005000	0.000005011	0.000005148
subscribe	11	6557	12557	8602	0.000005002	0.000005344	0.000009301
transfer_fixed	4	8465	8465	8465	0.000005002	0.000005338	0.000009232
transfer_recurring	13	8546	8616	8567	0.000005002	0.000005342	0.000009283
transfer_subscription	10	8826	8946	8869	0.000005002	0.000005354	0.000009434
update_plan	17	397	403	400	0.000005000	0.000005016	0.000005200

Generated: 2026-04-03