feat: allow subgraph indexing errors

[silent-cipher]

Ref: https://filecoinproject.slack.com/archives/C096DTH73T6/p1787808533173589?thread_ts=1787549150.920219&cid=C096DTH73T6

[vercel]

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[Copilot]

🟡 Changes recommended

There are blocking correctness/robustness issues in the new fetcher guard (TypeScript safety) and the banner logic now hides indexing errors unless the indexer is also delayed.

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Pull request overview

This PR updates the subgraph client to tolerate Graph Node indexing errors by (1) requesting partial data via subgraphError: allow on many queries and (2) treating indexing_error responses as non-fatal when the server still returns usable data. It also tweaks the UI banner logic around when indexing-error warnings are shown.

Changes:

• Adds subgraphError: allow to many entity/root-field queries so Graph Node can return partial data even when indexing errors exist.
• Updates the GraphQL fetcher to return data for 2xx responses that only contain indexing_error GraphQL errors.
• Adjusts the IndexerLagBanner messaging/conditions around indexing errors vs. lag.

File summaries

File	Description
subgraph-client/src/utility/queries.ts	Adds subgraphError: allow to multiple queries to permit partial results under indexing errors.
subgraph-client/src/utility/fetcher.ts	Swallows indexing_error-only GraphQL errors when the response includes usable data.
subgraph-client/src/components/shared/IndexerLagBanner.tsx	Changes when the indexing-error banner is shown and expands the banner message.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Lite

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