UI thread cleanup + tanstack virtualized

[adamleithp]

Changelog

• virtua → @tanstack/react-virtual
• scroll-to-bottom: 2 clicks → 1 click
• streaming text drifts off bottom → safety-net keeps it pinned
• session footer text: gray-10 → text-muted-foreground
• session footer: always visible → opacity 50% until thread hover
• session footer context indicator: flowed left when alone → always right
• thread edges: hard cut → scroll-mask fade
• message paragraphs: tight leading → leading-[1.9]
• pending permission box: max-h-1/2 + top border → no cap, no border
• prompt input wrapper: top border → no border
• prompt input: no focus ring → purple-9 focus-within ring
• prompt input block-end addon: no padding → p-1 for visual alignment
• prompt input row bottom padding: pb-2 → pb-3

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🤖 Generated with Claude Code

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
apps/code/src/renderer/features/sessions/components/VirtualizedList.tsx:94-97
**Stale scroll-button state on settle timeout**

When the RAF loop exhausts its 12 attempts without reaching the end, `settlingRef.current` is cleared but `onScrollStateChange` is never called. Because `setShowScrollButton(false)` was already fired in `ConversationView.scrollToBottom()`, the button stays hidden even though the list is not actually at the bottom. The state self-corrects on the next native scroll event, but if nothing triggers a scroll (e.g. streaming has paused), the user has no visible way to jump to the bottom until they manually scroll first.

_{Reviews (1): Last reviewed commit: "remove max-height + top border on pendin..." | Re-trigger Greptile}

[greptile-apps]

Stale scroll-button state on settle timeout

When the RAF loop exhausts its 12 attempts without reaching the end, settlingRef.current is cleared but onScrollStateChange is never called. Because setShowScrollButton(false) was already fired in ConversationView.scrollToBottom(), the button stays hidden even though the list is not actually at the bottom. The state self-corrects on the next native scroll event, but if nothing triggers a scroll (e.g. streaming has paused), the user has no visible way to jump to the bottom until they manually scroll first.

Prompt To Fix With AI

This is a comment left during a code review.
Path: apps/code/src/renderer/features/sessions/components/VirtualizedList.tsx
Line: 94-97

Comment:
**Stale scroll-button state on settle timeout**

When the RAF loop exhausts its 12 attempts without reaching the end, `settlingRef.current` is cleared but `onScrollStateChange` is never called. Because `setShowScrollButton(false)` was already fired in `ConversationView.scrollToBottom()`, the button stays hidden even though the list is not actually at the bottom. The state self-corrects on the next native scroll event, but if nothing triggers a scroll (e.g. streaming has paused), the user has no visible way to jump to the bottom until they manually scroll first.

How can I resolve this? If you propose a fix, please make it concise.