feat: workspace lives in the terminal view and keeps its sessions across pages; terminal panes split out

internal/server/web/templates/dashboard.html

@@ -15,10 +15,10 @@
           <td class="muted nowrap seen" data-l="Активность">{{.Seen}}</td>
           <td class="actions">
             <div class="row" style="gap:6px">
-              <a class="btn small icon" href="/agents/{{.ID}}/terminal" data-tip="Терминал" aria-label="Терминал">
+              <a class="btn small icon" href="/agents/{{.ID}}/terminal" data-open="term" data-id="{{.ID}}" data-name="{{.Name}}" data-host="{{.Hostname}}" data-user="{{.TerminalUser}}" data-tip="Терминал" aria-label="Терминал">
                 <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="4 17 10 11 4 5"/><line x1="12" y1="19" x2="20" y2="19"/></svg>
               </a>
-              <a class="btn ghost small icon" href="/agents/{{.ID}}/files" data-tip="Файлы" aria-label="Файлы">
+              <a class="btn ghost small icon" href="/agents/{{.ID}}/files" data-open="files" data-id="{{.ID}}" data-name="{{.Name}}" data-host="{{.Hostname}}" data-user="{{.TerminalUser}}" data-tip="Файлы" aria-label="Файлы">
                 <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z"/></svg>
               </a>
               <a class="btn ghost small icon" href="/agents/{{.ID}}/forwards" data-tip="Порты" aria-label="Порты">