Harden chat assets on demand

[suguanYang]

Summary

• Harden chat and citation assets one at a time through Notebook Blob instead of full durable chunk reads.
• Stop display chunk reads from requesting durable asset URLs; chat hardens only returned assets.
• Refresh localized remote sources after remote chunks load, preserve selection, and fail missing Knowhere reconcile jobs cleanly.

Verification

• pnpm test 'src/app/api/sources/[sourceId]/chunks/route.test.ts' src/components/workspace-selected-chunks.test.ts src/components/workspace-source-state.test.ts src/domains/chat/index.test.ts src/domains/chat/media-asset-hardening.test.ts src/domains/chat/media-assets.test.ts src/domains/chat/page-citation-assets.test.ts src/domains/chat/route-service.test.ts src/domains/chunks/read.test.ts src/domains/sources/source-reconcile-workflow.test.ts\n- pnpm typecheck (exit 0; existing Effect diagnostic TS47 in src/domains/sources/counts.ts)\n- git diff --cached --check

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Project	Deployment	Actions	Updated (UTC)
knowhere-notebook-staging	Ready	Preview, Comment	Jul 5, 2026 2:03pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
knowhere-notebook	Ignored		Jul 5, 2026 2:03pm