feat(web): updated tab, inline errors, card craft

Adds the Updated tab (series with an unread chapter) with its own empty
state, so "what's new" no longer means scanning the whole list.

A failed favourite/chapter/delete previously looked like an ignored tap:
htmx does not swap on a non-2xx response and nothing else said so. Errors
now surface inline on the card. The two per-card panels (chapter edit,
delete confirm) also close each other.

Mobile fixes, all measured at 360/390px rather than eyeballed:
.chapter-form and .confirm-row now wrap so the hint and the prompt take
their own row, and the number input shrinks (flex-basis 0) instead of
holding its ~20ch intrinsic width. Before this the Save button sat off
screen — 97px of page overflow at 390px, 127px at 360px — which broke
correcting a chapter number on the one device class this is built for.

Emoji glyphs replaced with inline SVG on currentColor: each rendered in a
different face at a different weight and colour, ignoring the card's own
type and colour system. No icon font or library.

Series with no scraped og:image render a title-initial monogram instead
of a blank rectangle that read as a cover still loading.

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

backend/templates/card.html

@@ -1,37 +1,69 @@
 {{define "card"}}
 <article class="card" id="card-{{.Key}}" data-title="{{.Title}}">
   <a class="cover" href="{{.ContinueURL}}" target="_blank" rel="noopener noreferrer">
-    {{if .Cover}}<img src="{{.Cover}}" alt="" loading="lazy">{{end}}
+    {{if .Cover}}<img src="{{.Cover}}" alt="" loading="lazy">
+    {{else}}<span class="cover-blank" aria-hidden="true">{{.Initial}}</span>{{end}}
+    {{if .HasNewChapter}}<span class="new-ribbon">New</span>{{end}}
   </a>
   <div class="body">
     <h3 class="title">{{.Title}}</h3>
     <p class="meta">
       <span class="site site-{{.Site}}">{{.Site}}</span>
       <span class="chapter">Ch {{.LastChapter}}</span>
-      {{if .HasNewChapter}}<span class="new">NEW {{.LatestChapter}}</span>{{end}}
+      {{if .HasNewChapter}}<span class="new-chapter">Ch {{.LatestChapter}} out</span>{{end}}
     </p>
     <div class="actions">
-      <a class="primary" href="{{.ContinueURL}}" target="_blank" rel="noopener noreferrer">Continue</a>
+      <a class="primary" href="{{.ContinueURL}}" target="_blank" rel="noopener noreferrer"
+         title="Continue reading" aria-label="Continue reading">
+        <svg viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" focusable="false">
+          <path d="M8 4.8a1 1 0 0 1 1.52-.85l10 7.2a1 1 0 0 1 0 1.7l-10 7.2A1 1 0 0 1 8 19.2z"/>
+        </svg>
+      </a>
       <button class="icon {{if .Favorite}}on{{end}}"
               title="Favourite" aria-label="Toggle favourite"
               hx-post="/ui/bookmarks/{{.Key}}/favorite"
-              hx-target="[id='card-{{.Key}}']" hx-swap="outerHTML">
-        {{if .Favorite}}★{{else}}☆{{end}}
+              hx-target="[id='card-{{.Key}}']" hx-swap="outerHTML"
+              hx-indicator="[id='card-{{.Key}}']" hx-disabled-elt="this">
+        <svg viewBox="0 0 24 24" fill="{{if .Favorite}}currentColor{{else}}none{{end}}"
+             stroke="currentColor" stroke-width="1.7" stroke-linejoin="round"
+             aria-hidden="true" focusable="false">
+          <path d="M12 3.7l2.63 5.33 5.87.86-4.25 4.14 1 5.85L12 17.31l-5.25 2.57 1-5.85L3.5 9.89l5.87-.86z"/>
+        </svg>
       </button>
       <button class="icon" title="Set chapter" aria-label="Set chapter"
-              onclick="toggleChapterForm('{{.Key}}')">✎</button>
+              onclick="toggleChapterForm('{{.Key}}')">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7"
+             stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" focusable="false">
+          <path d="M4 20h4L19.3 8.7a1.5 1.5 0 0 0 0-2.12l-1.88-1.88a1.5 1.5 0 0 0-2.12 0L4 16z"/>
+          <path d="M13.8 7.2l3 3"/>
+        </svg>
+      </button>
       <button class="icon danger" title="Remove" aria-label="Remove"
-              hx-delete="/ui/bookmarks/{{.Key}}"
-              hx-target="[id='card-{{.Key}}']" hx-swap="outerHTML"
-              hx-confirm="Remove {{.Title}} from the list?">🗑</button>
+              onclick="toggleConfirmRow('{{.Key}}')">
+        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7"
+             stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" focusable="false">
+          <path d="M4.5 6.8h15M9.8 6.8V4.6h4.4v2.2M7.3 6.8l.9 12.6h7.6l.9-12.6"/>
+        </svg>
+      </button>
     </div>
     <form class="chapter-form" id="chapter-form-{{.Key}}" hidden
           hx-post="/ui/bookmarks/{{.Key}}/chapter"
-          hx-target="[id='card-{{.Key}}']" hx-swap="outerHTML">
+          hx-target="[id='card-{{.Key}}']" hx-swap="outerHTML"
+          hx-indicator="[id='card-{{.Key}}']" hx-disabled-elt="input, button">
+      {{if .LatestChapter}}<p class="hint">Latest known: Ch {{.LatestChapter}}</p>{{end}}
       <input name="chapter" type="number" step="0.1" min="0"
              value="{{.LastChapterNum}}" aria-label="Chapter number" required>
       <button type="submit">Save</button>
     </form>
+    <div class="confirm-row" id="confirm-row-{{.Key}}" hidden>
+      <span>Remove this?</span>
+      <button class="danger-solid"
+              hx-delete="/ui/bookmarks/{{.Key}}"
+              hx-target="[id='card-{{.Key}}']" hx-swap="outerHTML"
+              hx-indicator="[id='card-{{.Key}}']" hx-disabled-elt="this">Remove</button>
+      <button type="button" onclick="toggleConfirmRow('{{.Key}}')">Cancel</button>
+    </div>
+    <p class="error-inline" hidden></p>
   </div>
 </article>
 {{end}}