feat: ctx.data.staleWhileRevalidate() — host-owned stale-while-revalidate for extension views

[pablopunk]

What

Adds ctx.data.staleWhileRevalidate() — a synchronous host-owned stale-while-revalidate primitive for extension views. Extensions show cached items immediately with a subtle loading bar while fresh data loads in the background.

Before

Extensions had two bad options for data views:

• Block until fetch completes → blank spinner every time
• Manual caching + refresh → complex, brittle, no loading indicator when items exist

After

items: ctx.data.staleWhileRevalidate({
  cacheKey: 'my-data',
  loader: async () => { /* fetch and return items */ },
})

Cache state	UX
Fresh (<60s)	Items render instantly, no loader runs
Stale (60s–5min)	Cached items + loading bar, background refresh
No cache	Deferred spinner (same as loader())
Loader fails + stale cache	Graceful fallback to stale items

Also fixed

The loading indicator was broken when items existed — isLoading only showed a spinner when items were empty. Added a subtle 2px animated gradient bar (.viewLoadingBar) that renders in list/grid views when both isLoading and items are present.

Changes (8 files, +389/-8)

• src/electron/data-loader.ts — extended DataLoaderHandle, registry spawn() owns full S-W-R lifecycle
• src/electron/main.ts — sync staleWhileRevalidate() API in extension context
• src/electron/data-loader.test.ts — 5 new tests
• src/resources/nevermind-extension-api.d.ts — API types + TSDoc
• src/ui.tsx — viewLoadingBar in ListView/GridView
• src/styles.css — loading bar animation
• src/App.tsx — hydrate respects payload.isLoading
• src/preload-api.ts — widened ViewHydratePayload.isLoading

Validation

• TypeScript: clean
• Tests: 94/94 frontend pass (0 regressions)
• All build checks pass

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Project	Deployment	Actions	Updated (UTC)
nvm	Ready	Preview, Comment	Jun 20, 2026 12:48am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ab1641ef-46e5-4d5f-8c06-efe32c63addd

📥 Commits

Reviewing files that changed from the base of the PR and between e6e140a and f152ba5.

📒 Files selected for processing (8)

• src/App.tsx
• src/electron/data-loader.test.ts
• src/electron/data-loader.ts
• src/electron/main.ts
• src/preload-api.ts
• src/resources/nevermind-extension-api.d.ts
• src/styles.css
• src/ui.tsx

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