Fix broken merge state: restore app.js functions, pkg import, and refactor collectRelationEdges

[Copilot]

A bad merge left several critical runtime breakages across index.js, public/app.js, and dataService.js — causing GET / to 500, the graph UI to fail loading data, and the details panel to render incomplete.

index.js

• Added missing import pkg from './package.json' with { type: 'json' } — pkg.version was referenced but never imported, causing every GET / request to throw a ReferenceError

public/app.js

• fetchExportData: Fixed duplicate let res declaration, improperly nested try, and missing res.json() return (was returning undefined relations)
• buildRelationsMap: Restored function that was lost in the merge but still called by fetchData
• showNodeDetails: Restored full function body — was truncated after the status badge, omitting currency, parent/child chains, RPCs, explorers, website rendering, and panel reveal
• showWebsite: Replaced broken implementation (unclosed try, out-of-scope node/panel variables) with correct URL protocol validation — only http:/https: schemes render as links; others fall back to plain text:

const protocol = url.protocol.toLowerCase();
if (protocol === 'http:' || protocol === 'https:') {
    // render anchor
} else {
    webElem.textContent = data.infoURL; // unsafe scheme: plain text
}

dataService.js

• collectRelationEdges: Added missing edge deduplication logic; updated traverseRelations to delegate to this helper using a Set for O(1) key lookup instead of the previous O(n²) Array.some() scan per edge

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