Split view, personal modes, budget warnings, server move script

- Up to three chats side by side (#/s/a+b+c), "Open beside" in the sidebar menu
- File manager tabs of a chat stored per user on the server (/sessions/{id}/tabs)
- Personal modes for every user (Settings → My modes, /account/modes)
- Budget meters (total, provider, images, opencode Go windows) with push warnings
  for admins at the warning share and 100 %, shown in the status overlay
- scripts/move-server.sh: move to another Docker host with bind mounts (Unraid);
  scripts/smoke-test.sh

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/components/Settings.tsx

@@ -12,6 +12,7 @@ import { setReasoningMode, useReasoningMode, type ReasoningMode } from "../prefs
 import { ModelSelect } from "./ModelSelect";
 import { Account } from "./settings/Account";
 import { Templates } from "./settings/Templates";
+import { PersonalModes } from "./settings/PersonalModes";
 import { AgentsEditor } from "./settings/AgentsEditor";
 import { Folders } from "./settings/Folders";
 import { Users } from "./settings/Users";
@@ -1039,8 +1040,8 @@ function Raw({ reload }: { reload: () => void }) {
 
 // --- page -------------------------------------------------------------------
 
-const ADMIN_TABS = ["general", "providers", "agents", "mcp", "permissions", "users", "folders", "tools", "audit", "templates", "account", "raw"] as const;
-const USER_TABS = ["general", "templates", "account"] as const;
+const ADMIN_TABS = ["general", "providers", "agents", "mcp", "permissions", "users", "folders", "tools", "audit", "templates", "modes", "account", "raw"] as const;
+const USER_TABS = ["general", "templates", "modes", "account"] as const;
 const TAB_ICONS: Record<string, string> = {
   general: "gear",
   providers: "brain",
@@ -1052,6 +1053,7 @@ const TAB_ICONS: Record<string, string> = {
   tools: "toolbox",
   audit: "scroll",
   templates: "template",
+  modes: "sparkle",
   account: "user",
   raw: "file-text",
 };
@@ -1088,6 +1090,7 @@ export function Settings({ tab, onMenu }: { tab?: string; onMenu: () => void })
           {!isAdmin && active === "general" && <InterfaceSettings />}
           {active === "account" && <Account />}
           {active === "templates" && <Templates />}
+          {active === "modes" && <PersonalModes />}
           {cfg && active === "users" && <Users />}
           {cfg && active === "folders" && <Folders />}
           {cfg && active === "audit" && <Audit />}