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* fix(frontend): truncate long subtask card titles to a single line The subtask card header rendered task.description without any width constraint; when a provider omits the optional description, the full task prompt becomes the title and overflows the card. Wrap the title in a truncating span (full text remains available via the title tooltip and the expanded card body), give the step min-w-0 flex-1, and pin the status cluster with shrink-0 so overflow resolves at the title. Add an e2e test asserting a long prompt renders with the truncate class, a real ellipsis (scrollWidth > clientWidth), and single-line height. * fix(frontend): keep subtask card status cluster shrinkable on narrow viewports The shrink-0 status cluster could not shrink below its max-content (model label + usage + status pill, up to ~456px with a long tool-call description), so on narrow viewports it overflowed the header row while the title collapsed to zero. Drop shrink-0 and add min-w-0 to both the cluster and the pill (the pill's min-content is the status text's longest unbreakable word, so one min-w-0 was not enough), and floor the title at min-w-24 so it stays visible. Also extend the e2e spec per review: an in_progress shimmer truncation test (held-open SSE stream keeps the card running), a 375px no-overflow assertion for both the resting and running card, and a pixel-budget single-line check instead of parseFloat(lineHeight) which NaNs on the 'normal' keyword. * test(frontend): honest fixture text and explicit visibility timeout in subtask spec Review nits: the long-title fixture lifted the stopped test's human turn whose text narrates the stop scenario; give it its own LONG_TASK_USER_TEXT and override content alongside id and tool_calls. Add the missing 15s timeout on the running-375px title visibility assertion so a future reorder doesn't turn the 5s default into a cold-start flake.