fix: scroll the logs search page to the bottom on chart clicks and the subnav link

[chasers]

Two breaks on the logs search page.

Subnav "scroll down" link did nothing

The link called Source.scrollOverflowBottom/0, which selects #logs-list li:nth(0). :nth() is not a jQuery 3 selector, so the click throws. Even if it ran, it targeted the first event, which is the top of the list. The link now dispatches logflare:scroll-to-bottom, the same pattern the copy link uses, and the function is removed.

Chart clicks and drag-selections did not scroll to the results

The chart pushes datetime_update, which sets tailing? to false. Since #3688 the SourceLogsSearchList hook scrolls to the bottom only while tailing and otherwise restores the previous scroll anchor, so the page stayed put. Before #3688 every list update scrolled to the bottom as a side effect.

The LiveView now sets scroll_to_bottom_on_result? on datetime_update and pushes scroll-to-bottom when that search's first event page lands. The hook handles the event in mounted/0. Pagination keeps its scroll anchor.

scrollToPageBottom/0 in assets/js/utils.js is the single implementation for the hook, the window listener and the link.

Verification

• mix test test/logflare_web/live/search_live/logs_search_lv_test.exs — 89 tests, 0 failures, including a new assertion that datetime_update pushes scroll-to-bottom once and clears the flag.
• npm test — 63 tests, 0 failures, with two new files covering the hook handler and the helper.
• MIX_ENV=test mix ci — exit 0.

🤖 Generated with Claude Code

https://claude.ai/code/session_01YQ8Y8zCvSKUFNPvkwH2WS4

[chasers]

Follow-up commit: the top Load more button.

The older page was loading correctly. #logs-list is column-reverse, rows are newest-first, and put_event_page/3 appends the page at the DOM end, which is the visual top. The pagination tests already assert that order.

What hid it: SourceLogsSearchList.updated/0 restores the scroll anchor, so the existing rows keep their screen position and the new rows land above the viewport together with the button. Nothing appears to change.

put_event_page/3 for :previous now pushes scroll-to-event with the DOM id of the oldest loaded row, and the hook scrolls it into view. The bottom button, tailing, and scroll-to-bottom are unchanged. The pagination test asserts the push and that no scroll-to-bottom fires.

Verified: logs_search_lv_test.exs 89/0, npm test 65/0, MIX_ENV=test mix ci exit 0.