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* ui: remove viewport fade in and smooth autoscroll bottom snap fadeInView mounted every message and markdown block at opacity 0 and relied on an IntersectionObserver to reveal it. When the observer never fires (blocks mounted offscreen during long agentic loops) the content stays invisible forever while still present in the DOM. Remove the action, its orphaned isElementInViewport util and all call sites: blocks now render visible immediately. AutoScrollController.scrollToBottom defaulted to behavior smooth and is invoked every 100 ms while streaming. Each tick restarts an easing animation toward a moving scrollHeight, producing a random elastic bump of a few pixels when the user reaches the bottom and autoscroll reengages. Default to instant scrolling; the user facing scroll down button keeps its smooth behavior. * ui: skip rendering of offscreen chat messages via content-visibility Apply content-visibility auto with contain-intrinsic-size to chat messages so the browser skips layout and paint for messages outside the viewport. The DOM stays complete: component state, find-in-page, text selection, and the mutation based autoscroll are unaffected, and browsers without support simply ignore the properties. * ui: remove conversation switch fade Switching conversations faded the message list out and in over 500 ms plus a 300 ms route delay, deferring the message refresh behind two requestAnimationFrame calls. Remove the fade, its navigation hooks and dead state, and refresh messages directly so switching is only bound by actual render time. * ui: describe present behavior in comments and drop unused parameter * ui: anchor the context gauge popup to the form with plain CSS The stats card was portaled to body and repositioned in script on every ancestor scroll event, trailing the page by one frame while streaming. Render it as an absolutely positioned sibling of the input box inside the already relative form, so nothing runs during scroll. The card sits just above the dial, centered on it and overlapping the textarea, from a single measurement of the dial center and top taken when it opens; the dial and the card share the same positioning frame, so the values stay exact while the card is open. Mouse pointers open on hover with a grace delay to reach the card, touch pointers toggle on tap, any press outside the card and the dial closes it, and Enter and Space toggle from the keyboard. The card lives outside the input box because its overflow-hidden and backdrop-filter would clip any positioned descendant. * ui: extract context gauge popup constants and relocate its state store Move the placement values and the close grace delay to lib/constants/context-gauge-popup.ts, matching the auto-scroll constants layout, and move the popup state module from the component folder to lib/stores where runes modules live in this codebase. * ui: declare the context gauge popup card ref as $state