[floze-the-genius]

Summary

• replace the simple Axios GET calls in the store and concept details with a small fetchJson helper that preserves non-2xx error handling
• replace mapping-browser cancel tokens with AbortController signals passed through cocoda-sdk
• ignore superseded aborts while still surfacing genuine registry request failures

Refs #787.

The custom MeSH provider is intentionally unchanged because its move/removal is tracked separately by #786.

Validation

• npm run lint (passes with the two existing component-name warnings in src/main.js)
• npm run build
• direct success/non-2xx contract check for fetchJson
• delayed local HTTP request proving that cocoda-sdk propagates the AbortSignal and cancels the request

Implementation and validation were assisted by Codex.

[nichtich]

Thanks for your contribution. This first needs to be tested by hand in a live instance of Cocoda application, in particular because HTTP calls from browser are slightly different then HTTP calls from NodeJS. We also plan to remove axios in dependency cocoda-sdk, to a thin class HTTPClient is favoured over utility function fetchJSON.