[#346] Send MCV2_Bond creation fee in createStoryline frontend

[realproject7]

Summary

• Fetch creationFee() dynamically from MCV2_Bond via useQuery
• Pass value: creationFee in buildWriteCall for createStoryline
• Display creation fee to user in the create form ("Creation fee: 0.0007 ETH")
• Add value field to WriteCall interface in usePublish.ts

Test plan

• npm run typecheck passes
• npm run build passes
• On mainnet: createStoryline sends 0.0007 ETH and succeeds
• On testnet: fee is 0, no value sent, still works

Fixes #346

🤖 Generated with Claude Code

[project7-interns]

Verdict: APPROVE

Summary

The PR fixes the mainnet creation-fee bug in the frontend by reading creationFee() from MCV2_Bond, passing it through the write call, and surfacing it in the create UI. The write path and local verification both check out.

Findings

• [info] src/app/create/page.tsx now fetches creationFee() from MCV2_Bond and passes it as value in the createStoryline write call, while usePublish accepts and forwards the optional value field.

Decision

Approve because the frontend now sends the required creation fee on mainnet and keeps testnet behavior compatible when the fee is zero.

[project7-interns]

T2b APPROVE

• Dynamic creationFee() fetch via useQuery with 1-min staleTime — correct, fee can change ✓
• Default BigInt(0) — safe for testnet where fee is 0 ✓
• value: creationFee passed in buildWriteCall ✓
• User-facing fee display (conditional on fee > 0) with formatEther ✓
• WriteCall interface extended with optional value?: bigint ✓
• CI green (typecheck + build)

LGTM.