Fix indexer 502: restore 5s delay before indexer call in usePublish

[realproject7]

Problem

After createStoryline or chainPlot tx confirms, the indexer API call returns 502 ("Failed to fetch transaction receipt"). The server-side RPC node hasn't synced the receipt yet due to Base Sepolia load-balanced RPC propagation delay.

Evidence: TX 0x55218d... succeeded on-chain but indexer returned 502. Manual replay 1 minute later succeeded.

Root cause: Commit 71c66b8 ([#170]) removed the 5s client-side delay from usePublish.ts with the reasoning that "server-side retry window (30s) is sufficient." It's not — especially for heavy txs like createStoryline (~14.4M gas). The old contract worked because the 5s delay was still in place at that time.

Fix

In src/hooks/usePublish.ts, restore the 5s delay before the indexer fetch:

// Before (line 90-92)
// 4. Trigger indexer
setState("indexing");
await fetch(opts.indexerRoute, {

// After
// 4. Trigger indexer (delay for RPC propagation on Base Sepolia)
setState("indexing");
await new Promise((r) => setTimeout(r, 5000));
await fetch(opts.indexerRoute, {

Files

• src/hooks/usePublish.ts — add await new Promise((r) => setTimeout(r, 5000)); before the indexer fetch (after setState("indexing"))

Acceptance criteria

• 5s delay before indexer API call in usePublish
• Storyline creation successfully indexes after tx confirmation
• npm run typecheck passes