slskd: /soulseek search + downloads on the Workspace/Panel framework

Two panels (search + transfers) via WorkspaceView, coordinating over the
soulseek:refresh channel. Adds the page-title rule and documents the
route conventions in CLAUDE.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/apps/officer-web/Screens/Dashboard/Layout/Header/Header.tsx

@@ -118,7 +118,11 @@ export function Header({ dockItems }: HeaderProps) {
                         boxShadow: active ? `0 0 12px ${item.color}40` : 'none',
                       }}
                     >
-                      <item.icon className="h-4 w-4 text-white" />
+                      {item.image ? (
+                        <img src={item.image} alt="" className="h-5 w-5 object-contain" />
+                      ) : (
+                        item.icon && <item.icon className="h-4 w-4 text-white" />
+                      )}
                     </div>
                     <span className={`text-sm ${active ? 'text-white font-medium' : 'text-white/80'}`}>
                       {item.label}