The actual cause of the search-field focus loss: SvelteKit's `goto()`
defaults to resetting focus on navigation, so each debounced URL update
blurred the input mid-typing. Pass `keepFocus: true` to both `goto()`
calls in `navigate()`.
The earlier `bind:value` change in 6931358 didn't address this — it was
solving a hypothetical DOM-write-side cursor-jump issue rather than the
real focus-reset behavior. Leaving `bind:value` in place since it's
still cleaner Svelte 5.
Tests updated to match the new goto args.
bvandeusen
b7a59a9473