feat(webapp): enable plan editing on mainnet and testnet

[dev-jodee]

Summary

• Flip STABLE_FEATURES.updatePlan to true, enabling the plan-editing UI (gated in feat(webapp): gate plan editing behind network feature flag #232) on mainnet and testnet
• Merge after the v0.5.0 mainnet upgrade executes; the on-chain UpdatePlan instruction format ships with that deploy

Test Plan

• Existing webapp build + lint (green on this branch)
• Post-deploy: edit a plan on mainnet via the demo webapp

[vercel]

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Project	Deployment	Actions	Updated (UTC)
solana-subscriptions-program	Ready	Preview	Aug 10, 2026 1:43pm

[github-actions]

Compute Unit Report

Instruction	Samples	CUs	Est Cost (Low) [SOL]	Est Cost (Med) [SOL]	Est Cost (High) [SOL]	Δ Avg vs main
cancel_subscription	28	1838	0.000005000	0.000005073	0.000005919
cancel_subscription_now	5	1873	0.000005000	0.000005074	0.000005936
close_subscription_authority	22	1804	0.000005000	0.000005072	0.000005902
create_fixed_delegation	50	3524	0.000005001	0.000005140	0.000006762
create_plan	141	3501	0.000005001	0.000005140	0.000006750
create_recurring_delegation	35	3556	0.000005001	0.000005142	0.000006778
delete_plan	10	359	0.000005000	0.000005014	0.000005179
init_subscription_authority	231	6310	0.000005001	0.000005252	0.000008155
resume_subscription	4	2041	0.000005000	0.000005081	0.000006020
revoke_abandoned_delegation	3	403	0.000005000	0.000005016	0.000005201
revoke_abandoned_subscription	2	2052	0.000005000	0.000005082	0.000006026
revoke_delegation	24	282	0.000005000	0.000005011	0.000005141
revoke_subscription_authority	8	3576	0.000005001	0.000005143	0.000006788
subscribe	52	6642	0.000005001	0.000005265	0.000008321
transfer_fixed	10	5638	0.000005001	0.000005225	0.000007819
transfer_recurring	21	5749	0.000005001	0.000005229	0.000007874
transfer_subscription	14	5990	0.000005001	0.000005239	0.000007995
update_plan	31	2142	0.000005000	0.000005085	0.000006071

🔺 increase · 🔻 decrease · – unchanged · 🆕 new · 🗑 removed (vs main)

Generated: 2026-08-10

[amilz]

One-line STABLE_FEATURES.updatePlan flip; all CI green. Ship after the v0.5.0 mainnet upgrade lands per PR notes.