Keyboard, screen reader and contrast fixes from the interface review (#298 #299 #300 #301 #302 #303 #304 #305 #306 #307 #308 #309)

Found reviewing the main window, its dialogs and the Directory in all 25 palettes (13 themes,
light and dark), in Playwright against the test daemon.

- #298: an item's title is a button, so Tab and a screen reader can open it; the feed list's
  rows, places, Signals and the Directory's shows are links to a screen reader (asLink), named
  by what they show, the open one aria-current. Not role=button, which would flatten a folder's
  triangle inside it.
- #299: .ep:focus-within shows the row's actions; Tab reached Play and Delete at opacity 0.
- #300: the read toggle is named Mark read / Mark unread, the dot hidden from screen readers.
- #301: the seek slider is named Position, its value read as "12:30 of 45:00".
- #302: ::placeholder in --faint; the browser's grey was 2.7-4.4:1 in 20 palettes. The search
  and filter boxes have names that do not depend on their placeholder.
- #303: #toasts is role=status; an error toast stays until dismissed, at most four at once.
- #304: api() says what to do when iPX cannot be reached or answers 500 (whose text is the
  daemon's internals, already in its log); play() failures are put in words and reported, an
  AbortError ignored; a failed download names its item.
- #305, #308: --field, the theme's --fg mixed into --bg in OKLab (--fieldmix, 60% and up to 80%
  for Catppuccin light), edges text boxes, selects, chips, the OPML box and switch tracks,
  phones included, and rings a light theme's switch knob. tests/contrast.js holds it to 3:1 on
  bg, panel, panel2 and raise in every palette. --line stays for rules. Fields lose outline:0,
  so they take the same focus ring as everything else.
- #306: openModal makes the card role=dialog aria-modal, labelled by its heading, focuses it,
  and makes the rest of the body inert until closeModal, which gives focus back to what opened
  it. Not <dialog>: its top layer would cover the toasts and their Dismiss.
- #307: the labels in Add a feed, Settings, Download latest and OPML point at their boxes.
- #309: Settings shows iPX's and the page's versions at its foot.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/items.ts

@@ -162,13 +162,15 @@ function epEl(e: Entry){
   const num=[e.season?`S${e.season}`:'',e.episode?`E${e.episode}`:''].filter(Boolean).join('');
   const left = e.position>10 && e.duration ? `${clock(e.duration-e.position)} left` : (e.duration?clock(e.duration):'');
   const name=entryName(e);
+  // The title is a button, its click the row's, so Tab and a screen reader can open the item:
+  // the row alone was a click target only a mouse could reach (#298).
   el.innerHTML=`
-    <button class="st" data-a="read" title="Mark ${e.read?'unread':'read'}">${
-      player.guid===e.guid?EQ:(e.read?'':'●')}</button>
+    <button class="st" data-a="read" title="Mark ${e.read?'unread':'read'}" aria-label="Mark ${e.read?'unread':'read'}">${
+      player.guid===e.guid?EQ:(e.read?'':'<span aria-hidden="true">●</span>')}</button>
     <button class="fl${e.flagged?' on':''}" data-a="flag" aria-pressed="${!!e.flagged}" title="${
       e.flagged?'Unpin':'Pin, so it is never deleted'}">${e.flagged?ICON.pinOn:ICON.pin}</button>
     <div class="body">
-      <span class="t${name.derived?' notitle':''}">${esc(name.text)}</span>
+      <button type="button" class="t${name.derived?' notitle':''}">${esc(name.text)}</button>
       <div class="line">${[
         num&&`<span>${num}</span>`,
         left&&`<span>${left}</span>`,
@@ -283,7 +285,7 @@ function setRead(e: Entry,read: boolean){
 /// reloaded, so an item does not vanish from under the pointer on the Unread tab.
 function markRead(e: Entry){
   if(e.read) return;
-  setRead(e,true).catch(err=>{ e.read=false; readWrites.delete(readKey(e)); toast(err.message,true); });
+  setRead(e,true).catch(err=>{ e.read=false; readWrites.delete(readKey(e)); toast(why(err),true); });
 }
 
 /// On the Unread tab, the items read while turning from one to the next (a swipe, j and k), kept