One icon per meaning across the UI; mark everything read in All Subscriptions

- All Subscriptions' header checks every feed and marks everything read
  (POST /api/read-all, the same feeds the view lists); it asks first.
- Minus unsubscribes everywhere (the feed header's x read as "close"),
  x only closes or cancels, plus adds/subscribes/imports, and a dialog's
  confirm carries its action's icon. Remaining word buttons, the player
  and the folder arrow are Font Awesome 7.3.1 icons.
- Toolbar grouped by what it acts on (add, unsubscribe, scan | play,
  read, keep); read and keep show the selected item's state.
- The OPML subscription page uses the same header as a feed.
- Fixed: Escape ignored inside a dialog's text box (Add feed could not
  be closed with it), white password box in the dark theme, stray dot
  in an undated item's details.
- Tests: one action one icon across toolbar, page and all 8 dialogs;
  All Subscriptions mark everything read.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0173mGu6rK18Ne7UGTwAaVJV

CHANGELOG.md

@@ -22,6 +22,8 @@ The long form, with what was wrong before and how it was found, is in
   Subscriptions lists every item from every feed you subscribe to (`GET /api/entries`).
 - Items show as a table (unread, kept, item, feed, file, published) with a Files pane beside it,
   and a status bar with the totals.
+- Mark everything read from All Subscriptions, across every feed you subscribe to
+  (`POST /api/read-all`). It asks first. All Subscriptions can also check every feed from its header.
 
 ### Changed
 
@@ -38,10 +40,26 @@ The long form, with what was wrong before and how it was found, is in
   SVG: only the ones used, no font to download, and nothing fetched from anyone else. They
   replace font characters such as ⟳ ⤓ ↗, which came out thin and tiny and differed from font to
   font. Keep is a flag everywhere, as it was in the original, and mark unread is an envelope.
+- One meaning per icon. Minus unsubscribes, x closes or cancels, plus adds or subscribes, and a
+  dialog's confirm button carries the icon of what it does. The feed header's unsubscribe was an x
+  and read as closing the page. The remaining word buttons are icons too:
+  - Log, Add feed, Users, Unsubscribe and OPML.
+  - Popular's Subscribe, Copy and Sign out.
+  - The player's back, play, forward and close, which were font characters, and the folder arrow.
+- The toolbar's read and keep buttons show the selected item's state, with the same icons as the
+  item's own buttons. Play, read and keep sit together, and Scan sits with add and unsubscribe.
+- An OPML subscription's page has the same header as a feed's, with its buttons in the same places.
 - A file's type is an icon (audio, video, image, PDF, torrent, other), green once it is
   downloaded and red when the download failed, with the details in its tooltip. One icon per
   row keeps the column lined up. The DOWNLOADED and PENDING labels are gone.
 
+### Fixed
+
+- The password box in Manage users was white in the dark theme.
+- An item with no date showed a stray dot in its details.
+- Escape did not close a dialog while the cursor was in one of its boxes, so Add feed, which opens
+  in its URL box, could not be closed with Escape.
+
 ### Security
 
 - Feeds from paid-feed services (Patreon, Supercast, Supporting Cast, Glow, Memberful) are never