humanspeak / svelte-virtual-list / 29491054548

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feat(virtual-list): align center and scrollToOffset for programmatic scrolling (#425)

* feat(virtual-list): support align center in scroll() (#165)

Adds 'center' to the scroll alignment union with clamped centering math
in calculateTopToBottomScrollTarget (maxScrollTop param threaded from
the component), and extracts the shared scroll-execution tail into
executeScrollToTarget ahead of scrollToOffset. Red-first: the center
test failed against current code ("expected null to be 1820") before
the implementation.

Guard snapshot of Codex (GPT-5.6) executor work, steps 1-3 of plan 003.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(virtual-list): add scrollToOffset() and issue-165 center fixture (#165, #66)

scrollToOffset({ offset, smoothScroll }) restores raw pixel positions
through the shared executeScrollToTarget machinery (clamped to the
scrollable range, abort-safe). Self-judging issue-165 fixture with
red/green stat rows proves centering within 2px and offset restore
within 2px; scroll.spec gains deterministic (smooth-scroll-disabled)
center and end-clamp cases. README documents 'center' and the new
method.

Guard snapshot of Codex (GPT-5.6) executor work, steps 4-6 of plan 003
plus the smooth-scroll race fix from guard review.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* test(issue-165): explain probe timing and assert post-jump blank duration

The fixture now states that probes auto-run 500ms after load and that
brief red-backdrop flashes during the jumps are expected, and adds a
third stat measuring how long the backdrop stayed visible (worst of
both jumps, must be <=500ms) so a regression that leaves the viewport
blank after a programmatic jump fails in CI instead of being eyeballed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* docs(site): document center alignment and scrollToOffset()

Adds 'center' to the align option across the scroll-methods guide, API
methods reference, and SvelteVirtualListScr... (continued)

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