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### What? Redesigns the blocking-route error overlay for instant navigation errors with a distinct "Instant" overlay path, visual technique cards, and updated error wording framed around navigation impact. ### Why? The current overlay dumps every possible cause and fix in one block of text. The new design is friendlier — amber "Instant" badge, a short headline framed around navigation, and responsive code snippet cards showing each fix pattern. ### Demo - **Runtime template** (e.g. `cookies()`): https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/26-cookies-ssr-no-instant - **Dynamic template** (e.g. uncached `fetch`): https://error-messages-overhaul-ibsl.labs.vercel.dev/scenario/27-fetch-ssr-no-instant ### How? **Overlay** - New early-return path in `errors.tsx` for `blocking-route` errors without refinement — renders `InstantRuntimeError` with CodeFrame → description → technique cards → CallStack → ErrorCause - `InstantGuidance` component with responsive CSS grid of fix technique cards (3 per variant) - Color-coded cards with colored borders and matching highlight text (blue, purple, red) - "Make route params static" card (runtime only) has a dashed border indicating it's conditional **Build & CLI messages** - Build output messages extracted into `blocking-route-messages.ts` and deduplicated across `dynamic-rendering.ts` - `dynamicOrRuntimeBodyMessage` added for build-time static validation where the specific cause can't be pinpointed — lists all APIs (`fetch(...)`, `cookies()`, `headers()`, `params`, `searchParams`, `connection()`) - `isRuntimeVariant()` replaces the old `includes('cookies()')` heuristic which broke because both templates mention `cookies()` - `logBuildDebugHint()` extracted and shared between `logDisallowedDynamicError` and instant validation — adds "run `next dev`" and "`next build --debug-prerender`" hints to instant validation build output Results: <img width="2094" height="1478" alt="Google Chrome 2026-04-17 16 37 00" src="https://github.com/user-attachments/assets/04f126c5-250c-4e6e-bad0-d6960496cd13" /> <img width="1978" height="1512" alt="Google Chrome 2026-04-17 16 36 37" src="https://github.com/user-attachments/assets/46a502d8-9500-4055-814b-3efb739949db" /> --------- Co-authored-by: Janka Uryga <[email protected]>