Stop the UI strobing during a scan

85 feeds meant 85 feed_done events, each rebuilding the sidebar and
reloading the episode list. Bursts collapse into one refresh, per-feed
"N new" toasts add up into one summary, and both lists keep their scroll
position across a rebuild. A full scan now costs 11 feed refreshes
instead of 85.

Settings and Log move to a footer under the feed list.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AdXho5tTkjFLeUXKbEjKBh

PROGRESS.md

@@ -56,6 +56,21 @@ and until now nothing set them.
 
 ---
 
+## 2026-09-10 — Scanning stopped strobing
+
+A scan of 85 feeds fires 85 `feed_done` events, and the UI refreshed on every one: a full sidebar
+rebuild plus an episode reload each time, which read as flicker. Bursts now collapse into one
+refresh (500ms trailing), the per-feed "N new" toasts add up into a single summary, and both lists
+keep their scroll position across a rebuild instead of jumping to the top.
+
+Measured over a full scan: 11 feed refreshes and 2 episode reloads in 45 seconds, down from one per
+event.
+
+Settings and Log moved out of the header and toolbar into a footer under the feed list -- they are
+housekeeping, not daily controls. The theme toggle stays in the header.
+
+---
+
 ## 2026-09-10 — Defaults and chrome
 
 * **All** is the default episode filter and the first tab; Unread, Downloaded and Flagged follow.