Three-pane layout: feeds, items, item text

Feeds beside, the feed's items above, and the selected item's text with
its enclosures below -- the shape iPodderX used. Selecting a row fills the
pane below instead of expanding inline; enclosures render there as a
player when the file is present and a labelled download when it is not.
The divider drags and its position is remembered.

The archived site kept no usable screenshot of the original window, only
marketing panels, so this follows the description rather than reference
art.

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

README.md

@@ -164,6 +164,13 @@ server-side before they reach the page.
 clear — and a feed URL can itself contain a credential (Patreon's, for one, carries an auth token).
 Put it behind a reverse proxy with TLS if that matters to you.
 
+## Layout
+
+Feeds down the side; the selected feed's episodes across the top; the selected episode's text and
+its enclosures in the pane below, which is where you play, download or delete them. The divider
+between the two panes drags and the position is remembered. An OPML subscription's page instead
+lists the feeds inside it.
+
 ## Log view
 
 The **Log** button in the sidebar shows the running daemon's output live, in four tabs: