Favicon, level file icons, and a feed error mark in the triangle's column

- The logo as favicon, squared up (it is 128x121), at /favicon.png and at
  /favicon.ico outside the auth layer, where a browser asking on its own got a
  401; an apple-touch-icon on white (#32).
- An item not yet downloaded had its download bar on a line of its own under the
  file icon, lifting the icon above its row's; the bar now sits under it without
  taking space (#31).
- A feed error is Font Awesome's exclamation, hung in the margin where a folder's
  triangle is, in the same column; a folder holding a failing feed has its
  triangle turn red.

Closes #31, #32.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

web/src/feeds.ts

@@ -83,13 +83,15 @@ function renderFeeds(){
     el.tabIndex=0; el.dataset.id=f.id;
     const open = !!(kids && (expanded.has(f.id) || q));
     el.innerHTML =
-      (kids?`<button class="chev" aria-expanded="${open}" title="Show or hide the feeds inside" aria-label="Show or hide the feeds inside">${ICON.caret}</button>`:'')+
+      // The error mark hangs in the margin where a folder's triangle does. A folder already has
+      // its triangle there, so that turns red instead, and the feed inside shows the mark.
+      (kids?`<button class="chev${err?' bad':''}" aria-expanded="${open}" title="${err?`A feed inside has a problem: ${esc(err)}`:'Show or hide the feeds inside'}" aria-label="Show or hide the feeds inside">${ICON.caret}</button>`
+        :err?`<span class="ferr" role="img" title="${esc(err)}" aria-label="Error: ${esc(err)}">${ICON.alert}</span>`:'')+
       (mine.length?folderArt(f,mine):artHTML(f.image,f.title||f.id))+
       `<div class="txt"><b>${esc(f.title||f.id)}</b><small>`+
       `${mine.length?plural(mine.length,'feed'):plural(eps,'item')} · ${saved} downloaded`+
       `</small></div>`+
       (f.orphaned?'<span class="tag" title="No longer listed, kept because it has downloads">Gone</span>':'')+
-      (err?`<span class="tag" style="color:var(--bad)" title="${esc(err)}" aria-label="Error: ${esc(err)}">!</span>`:'')+
       `<span class="badge${unread?'':' zero'}" title="${unread} unread">${unread>999?'999+':unread}</span>`;
     el.onclick=()=>{ selectFeed(f.id); nav(false); };
     if(kids) $('.chev',el).onclick=ev=>{ ev.stopPropagation(); toggleGroup(f.id); };

web/src/util.ts

@@ -45,6 +45,7 @@ const ICON={
   back:fa('0 0 512 512','<path fill="currentColor" d="M24 192l144 0c9.7 0 18.5-5.8 22.2-14.8s1.7-19.3-5.2-26.2l-46.7-46.7c75.3-58.6 184.3-53.3 253.5 15.9 75 75 75 196.5 0 271.5s-196.5 75-271.5 0c-10.2-10.2-19-21.3-26.4-33-9.5-14.9-29.3-19.3-44.2-9.8s-19.3 29.3-9.8 44.2C49.7 408.7 61.4 423.5 75 437 175 537 337 537 437 437S537 175 437 75C342.8-19.3 193.3-24.7 92.7 58.8L41 7C34.1 .2 23.8-1.9 14.8 1.8S0 14.3 0 24L0 168c0 13.3 10.7 24 24 24z"/>'), // solid/rotate-left
   fwd:fa('0 0 512 512','<path fill="currentColor" d="M488 192l-144 0c-9.7 0-18.5-5.8-22.2-14.8s-1.7-19.3 5.2-26.2l46.7-46.7c-75.3-58.6-184.3-53.3-253.5 15.9-75 75-75 196.5 0 271.5s196.5 75 271.5 0c8.2-8.2 15.5-16.9 21.9-26.1 10.1-14.5 30.1-18 44.6-7.9s18 30.1 7.9 44.6c-8.5 12.2-18.2 23.8-29.1 34.7-100 100-262.1 100-362 0S-25 175 75 75c94.3-94.3 243.7-99.6 344.3-16.2L471 7c6.9-6.9 17.2-8.9 26.2-5.2S512 14.3 512 24l0 144c0 13.3-10.7 24-24 24z"/>'), // solid/rotate-right
   pause:fa('0 0 384 512','<path fill="currentColor" d="M48 32C21.5 32 0 53.5 0 80L0 432c0 26.5 21.5 48 48 48l64 0c26.5 0 48-21.5 48-48l0-352c0-26.5-21.5-48-48-48L48 32zm224 0c-26.5 0-48 21.5-48 48l0 352c0 26.5 21.5 48 48 48l64 0c26.5 0 48-21.5 48-48l0-352c0-26.5-21.5-48-48-48l-64 0z"/>'), // solid/pause
+  alert:fa('0 0 128 512','<path fill="currentColor" d="M64 432c22.1 0 40 17.9 40 40s-17.9 40-40 40-40-17.9-40-40c0-22.1 17.9-40 40-40zM64 0c26.5 0 48 21.5 48 48 0 .6 0 1.1 0 1.7l-16 304c-.9 17-15 30.3-32 30.3S33 370.7 32 353.7L16 49.7c0-.6 0-1.1 0-1.7 0-26.5 21.5-48 48-48z"/>'), // solid/exclamation
   caret:fa('0 0 256 512','<path fill="currentColor" d="M249.3 235.8c10.2 12.6 9.5 31.1-2.2 42.8l-128 128c-9.2 9.2-22.9 11.9-34.9 6.9S64.5 396.9 64.5 384l0-256c0-12.9 7.8-24.6 19.8-29.6s25.7-2.2 34.9 6.9l128 128 2.2 2.4z"/>'), // solid/caret-right
   left:fa('0 0 512 512','<path fill="currentColor" d="M9.4 233.4c-12.5 12.5-12.5 32.8 0 45.3l160 160c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3L109.3 288 480 288c17.7 0 32-14.3 32-32s-14.3-32-32-32l-370.7 0 105.4-105.4c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0l-160 160z"/>'), // solid/arrow-left
   subbed:fa('0 0 512 512','<path fill="currentColor" d="M256 512a256 256 0 1 1 0-512 256 256 0 1 1 0 512zM374 145.7c-10.7-7.8-25.7-5.4-33.5 5.3L221.1 315.2 169 263.1c-9.4-9.4-24.6-9.4-33.9 0s-9.4 24.6 0 33.9l72 72c5 5 11.8 7.5 18.8 7s13.4-4.1 17.5-9.8L379.3 179.2c7.8-10.7 5.4-25.7-5.3-33.5z"/>'), // solid/circle-check