Bulk bar and task board: polish seen

Seen while testing Task 7150 on the live stack (Activity feed board, bulk pick in progress, 1024px and 448px). 1. At phone width the bulk bar's Delete button drops its word and shows a red ✕ right beside the grey ✕ that clears the selection. Two ✕ glyphs side by side read as the same control; give Delete a distinct glyph (e.g. a trash mark) or keep a short word. 2. The floating help (✨) button overlaps the bulk dock's right end and the row ⋯ / checkbox column beneath it at 1024px; keep the FAB clear of the dock (lift it above the dock while a pick is in progress, or inset the dock). 3. In a 1024px split the task title crumb ("1: Retir…") gets only a few characters once the project and feature crumbs take their share; let the earlier crumbs cap lower when the title would fall below a readable floor. Out of scope: the bulk verbs' server rules, task states, the dock's sticky behaviour (Task 7150). Done means: - Each item shipped with a test, or declined with a stated reason. - Screenshots at 1024 and 448 showing each surface.

All 3 shipped with tests in PR #5848, merged by the lane (full gate green): bulk Delete shows 🗑 (tasks, nodes, users); Help launcher lifts above the bulk dock; title crumb floor min(12rem, 50%). Visual check at 1024/448 done. Deploy superseded. Follow-up draft #7194.