* fix(app): preserve chat scroll across workspace switches
Hidden retained panels can emit geometry-driven scroll events while collapsed, which previously looked like user intent and disabled output following. Keep the retained DOM mounted, suspend its inactive scroll work, and only detach from the bottom after explicit input.
* fix(app): classify chat scroll intent at input
A held pointer is not evidence that a geometry-driven scroll was user initiated. Detach output following directly from upward wheel, key, touch, or mouse-drag input, and keep ordinary scroll events responsible only for metrics and bottom reattachment.
* fix(app): keep editing keys out of scroll intent
Question inputs render inside the chat viewport, so their caret-navigation keys bubble through the same keyboard boundary. Treat keys from editable descendants as editing intent while preserving viewport-level keyboard scrolling.
* fix(app): exclude zoom gestures from scroll intent
Ctrl-wheel and trackpad pinch events can carry a negative wheel delta without scrolling chat content. Keep those browser zoom gestures from disabling output following.
* fix(app): require pointer-driven chat movement
Mouse movement alone is not viewport scroll intent. Correlate actual upward scroll with short-lived content-drag evidence or a scrollbar-gutter gesture, while excluding embedded editors and retaining geometry-only following.
* fix(app): recognize overlay chat scrollbars
* fix(app): scope scroll intent to chat viewport
* fix(app): rearm chat history at scroll start
* fix(app): track chat autoscroll intent
* fix(app): separate pointer scroll gestures
