dsh-smooth-plugin

In the DSH Web session, every stream tick triggers an instantaneous snap to the bottom, so the message list keeps jumping while a reply is still being generated. dsh-smooth-plugin replaces that staccato behavior with a constant-speed glide: a 240 ms ease-in ramp, a 0.9 px/ms cruise, and a 220 ms soft landing, letting the message list follow growing content along a smooth curve instead of bouncing frame by frame.\n\nThe plugin drives the native scrollTop directly together with a synthetic getter, so DSH's own follow-state machine always reads the target value rather than intermediate frames. This means no false detach, no per-frame animation restart, and no repeated pin-to-bottom. Genuine user scrolling via wheel or trackpad only stops the animation after two consecutive frames of divergence, while one-off non-user displacements such as browser scroll anchoring, content reflow clamping, and message-send jumps are absorbed automatically. A pointer press (for example, clicking the \"jump to turn N\" rail) halts the animation instantly and restores the real scroll position, with zero measured drift at the landing row. No CSS transform is ever applied, keeping the composer overlay and sticky elements untouched; when the OS-level \"reduce motion\" preference is active, the plugin falls back to the stock instant behavior.\n\nIf you spend a lot of time reading long streaming replies in the DSH Web GUI and find the repeated bottom snaps breaking your reading flow, this plugin drops in cleanly with no host-side code changes and no extra configuration required.