The "no-callback" and "no-prop" tests no longer rely on an arbitrary
50ms sleep. Test 2 awaits the mocked invalidateAll call (the last async
step of the upload handler) before asserting the callback was not
invoked. Test 3 lets vitest-browser-svelte's own expect.element poll
until the success message appears.
Addresses Sara's and Felix's review concern about flake-prone timing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Optional callback lets the parent route pop a post-upload banner without
lifting state into a store. Dashboard uses it to drive
UploadSuccessBanner (issue #296). Only fires when the server actually
created new documents — duplicates and errors do not trigger it.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
