ChatPage stays mounted (hidden) on every dashboard route so the PTY
survives tab switches. With the visualViewport listeners attached
unconditionally in the PTY effect, the NS-434 scroll pin
(window.scrollTo(0, 0)) fired whenever a soft keyboard opened on ANY
page — fighting iOS Safari's own scroll-into-view for focused inputs on
Settings, Sessions, etc.
Move listener attachment into an isActive-gated effect: attach on
chat-tab activation, detach on deactivation (clean lifecycle, no
if-check inside the hot handler). The handler reads through refs
populated by the PTY effect, so the two lifecycles stay independent.
Deactivation also clears any applied inset padding so a keyboard left
open during navigation can't strand stale bottom padding on the hidden
terminal wrapper.
Adds a component-level test asserting listeners attach only while
isActive and detach on deactivation.
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