asset load failure results in entire page broken

Describe the bug

This is the same bug as reported in https://github.com/sveltejs/kit/issues/2699
I am only opening a new one as the previous one was closed and might not get any traction. If you want to reopen the old one, feel free to close this as duplicate.

This is a real world problem any asset load failure during network fluctuation results in entire page broken even when the page is fully Server side rendered. This is a problem affecting real users, and we are really hoping to get this resolved for our Yahoo Finance users.

Proposal

Introduce an option in kit which when enabled, is going to catch such errors, so we don't show the default error page and atleast show the server side rendered markup.

Reproduction

https://github.com/benmccann/500-import-failure

Logs

System Info

System:
    OS: macOS 14.7.4
    CPU: (12) arm64 Apple M3 Pro
    Memory: 69.66 MB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.20.4 - ~/.nvm/versions/node/v18.20.4/bin/node
    npm: 10.7.0 - ~/.nvm/versions/node/v18.20.4/bin/npm
  Browsers:
    Chrome: 133.0.6943.142
    Safari: 18.3
  npmPackages:
    @sveltejs/adapter-node: ^5.2.9 => 5.2.9
    @sveltejs/kit: ^2.10.1 => 2.10.1
    @sveltejs/vite-plugin-svelte: ^3.1.2 => 4.0.4
    svelte: ^4.2.19 => 5.16.2
    vite: 5.2.13 => 5.2.13

Severity

blocking all usage of SvelteKit

Additional Information

No response

Start with the 500-import-failure reproduction linked in the issue and compare its behavior with the earlier issue #2699. Trace how SvelteKit handles an asset or import failure during SSR and hydration; done means a configured failure does not replace the server-rendered markup with the default error page.