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* sessions: Fix dock rail dots, flyout placement and hover flicker The dock variant of the prompt timeline had four issues: - The resting dots never reflected scroll position. The rail already received the active prompt on every scroll, but only the flyout rows were styled; the dot for the current prompt now takes the accent. - Dots were capped at the first 50 prompts, so in longer sessions the current prompt often had no dot at all. They are now evenly sampled across the session, so every dot maps to a real prompt. - The flyout was placed on top of the dots, which forced the handle to fade out on reveal. It now opens to the right of the dots, so they stay visible and interactive while it is open. - Approaching the handle from the left flickered: hover nudged it 1px out from under the pointer, the handle then went pointer-transparent while the panel slid right across it, and the collapse was instant. The nudge and the slide are gone and the collapse is debounced. Hovering an individual dot now previews its prompt, highlighting the row and scrolling it into view within the flyout. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * sessions: Address review feedback on the dock rail - Reduced motion now keys off the workbench-managed .monaco-reduce-motion class instead of the prefers-reduced-motion media query. The query only reflects the OS preference, so it diverged from the effective workbench.reduceMotion setting in both directions when that setting was forced on or off. Converted every block in the file, not just the new one, so the stylesheet uses a single mechanism. - Dropped the 150ms collapse debounce. It was masking a gap that placing the flyout at the handle's right edge had already closed, and it made collapse timing-dependent. The handle and flyout are now laid out flush via shared vars, so they are one contiguous hover region and a leave detected from relatedTarget is always a real leave. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>