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test: fix flake in shorthand timestamp search test

The retry loop was re-dispatching `start_search` every 50 ms, which
brutal-kills the previous search's in-flight Task before it can deliver
`:search_result`. Under CI timing this could leave the LiveView's
assigns frozen on the mount-time initial search's stale results for the
entire 5 s retry window. Wait for `last_query_completed_at` to advance
(via the existing `:wait_for_render` telemetry hook) before checking
the HTML so each retry runs a full search-to-assertion cycle.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>