Fix createStoryline gas limit: increase to 16M for 500-step bonding curve

[realproject7]

Problem

createStoryline() reverts with OutOfGas. The 500-step bonding curve creation on MCV2_Bond requires ~14.4M gas, but the explicit gas limit is set to 5_000_000 (from PR #245).

Trace evidence:

• TX 0x5fecc8... used 4,946,987 / 5,000,000 → OutOfGas
• TX 0x8ef626... used 6,915,737 / 7,000,000 → OutOfGas
• cast estimate on both old and new contracts: ~14.4M gas

Root cause: PR #245 added gas: BigInt(5_000_000) to fix a MetaMask gas estimation UX issue, but 5M is only ~1/3 of the actual gas needed. The old contract worked because it had no explicit gas cap — the wallet auto-estimated correctly at ~14.4M.

Fix

In src/app/create/page.tsx, change the gas parameter in the buildWriteCall:

// Before (line 120)
gas: BigInt(5_000_000),

// After
gas: BigInt(16_000_000),

16M provides safe headroom over the ~14.4M estimate. chainPlot gas at 500_000 in src/hooks/useChainPlot.ts is fine — it doesn't create a bonding curve.

Files

• src/app/create/page.tsx — line 120: change BigInt(5_000_000) to BigInt(16_000_000)

Acceptance criteria

• gas: BigInt(16_000_000) in createStoryline buildWriteCall
• npm run typecheck passes