refactor(ui): drop app footer, move author info to About panel

The "Created by Alexei Dolgolyov..." line lived in a global app
footer that took up vertical space on every page. Move the author
+ contact details into the About tab of the global settings modal
(rendered by renderAboutPanel), where they sit next to the version
pill and license. Adds a localized "donation.about_author" key
(en/ru/zh) and matching .about-hero .about-author styles. Removes
the now-unused .app-footer / .footer-content rules.

server/src/ledgrab/static/css/layout.css

@@ -888,38 +888,6 @@ h2 {
     flex-shrink: 0;
 }
 
-/* Footer */
-.app-footer {
-    margin-top: 12px;
-    padding: 6px 0;
-    text-align: center;
-}
-
-.footer-content {
-    color: var(--text-secondary);
-    font-size: 0.75rem;
-}
-
-.footer-content p {
-    margin: 0;
-}
-
-
-.footer-content strong {
-    color: var(--text-color);
-}
-
-.footer-content a {
-    color: var(--primary-text-color);
-    text-decoration: none;
-    transition: opacity 0.2s;
-}
-
-.footer-content a:hover {
-    opacity: 0.8;
-    text-decoration: underline;
-}
-
 /* Command Palette */
 #command-palette {
     position: fixed;

server/src/ledgrab/static/css/mobile.css

@@ -481,11 +481,6 @@
         margin-bottom: 10px;
     }
 
-    /* Footer */
-    .app-footer {
-        margin-bottom: 50px;
-    }
-
     /* Command palette */
     #command-palette {
         padding-top: 5vh;

server/src/ledgrab/static/css/modal.css

@@ -4601,6 +4601,32 @@ body.composite-layer-dragging .composite-layer-drag-handle {
     font-size: 0.78rem;
     color: var(--lux-ink-dim, var(--text-secondary));
 }
+.about-hero .about-author {
+    margin-top: 10px;
+    font-size: 0.78rem;
+    color: var(--lux-ink-dim, var(--text-secondary));
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    flex-wrap: wrap;
+    justify-content: center;
+}
+.about-hero .about-author strong {
+    color: var(--lux-ink, var(--text-color));
+    font-weight: 700;
+}
+.about-hero .about-author a {
+    color: var(--primary-text-color);
+    text-decoration: none;
+    transition: opacity 0.2s;
+}
+.about-hero .about-author a:hover {
+    opacity: 0.8;
+    text-decoration: underline;
+}
+.about-hero .about-author-sep {
+    opacity: 0.5;
+}
 .about-hero .about-links {
     display: flex;
     gap: 6px;

server/src/ledgrab/static/js/features/donation.ts

@@ -98,6 +98,11 @@ export function renderAboutPanel(): void {
                     <div class="about-name">${t('donation.about_title')}</div>
                     ${version ? `<div class="about-version">${version}</div>` : ''}
                     <div class="about-tag">${t('donation.about_opensource')}</div>
+                    <div class="about-author">
+                        ${t('donation.about_author')} <strong>Alexei Dolgolyov</strong>
+                        <span class="about-author-sep">·</span>
+                        <a href="mailto:dolgolyov.alexei@gmail.com">dolgolyov.alexei@gmail.com</a>
+                    </div>
                     ${linkButtons.length ? `<div class="about-links">${linkButtons.join('')}</div>` : ''}
                     <div class="about-license">${t('donation.about_license')}</div>
                 </div>

server/src/ledgrab/static/locales/en.json

@@ -2475,6 +2475,7 @@
   "donation.about_opensource": "LedGrab is open-source software, free to use and modify.",
   "donation.about_donate": "Support development",
   "donation.about_license": "MIT License",
+  "donation.about_author": "Created by",
 
   "streams.group.game": "Game Integration",
   "tree.group.game": "Game",

server/src/ledgrab/static/locales/ru.json

@@ -2190,6 +2190,7 @@
   "donation.about_opensource": "LedGrab — программа с открытым исходным кодом, бесплатная для использования и модификации.",
   "donation.about_donate": "Поддержать разработку",
   "donation.about_license": "Лицензия MIT",
+  "donation.about_author": "Создатель —",
 
   "streams.group.game": "Игровая интеграция",
   "tree.group.game": "Игры",

server/src/ledgrab/static/locales/zh.json

@@ -2188,6 +2188,7 @@
   "donation.about_opensource": "LedGrab 是开源软件，可免费使用和修改。",
   "donation.about_donate": "支持开发",
   "donation.about_license": "MIT 许可证",
+  "donation.about_author": "作者：",
 
   "streams.group.game": "游戏集成",
   "tree.group.game": "游戏",

server/src/ledgrab/templates/index.html

@@ -212,16 +212,6 @@
                 })();
             </script>
         </div>
-
-        <footer class="app-footer">
-            <div class="footer-content">
-                <p>
-                    Created by <strong>Alexei Dolgolyov</strong>
-                    • <a href="mailto:dolgolyov.alexei@gmail.com">dolgolyov.alexei@gmail.com</a>
-                    • <a href="#" onclick="openSettingsModal();switchSettingsTab('about');return false" data-i18n="donation.about_title">About</a>
-                </p>
-            </div>
-        </footer>
     </div>
     </main>
     </div>