Add workspaces, conversation sessions, app-managed computers and pictures

- Rail: Add icon with stacked form modals (bot, workspace, computer),
  coordinator, recent bots with "See all bots", Workspaces section, and
  a workspace mode listing only its crew
- Workspaces: page for context, bots (per-workspace instructions and
  memory), computers (default, link, unlink), models and delete;
  conversations scoped per bot per workspace
- Sessions: conversations split into searchable, reopenable sessions
  with carry-over summaries; sessions and new-session header icons
- Computers: created and provisioned over the docker socket, home dir
  kept at DATA_DIR/computers/<id> after delete; super admins only
- Models: workspace settings win over a bot's own, then the defaults
- Pictures for bots and workspaces; bots editable from the header
- Coordinator tools: update_workspace, set_bot_workspace_instructions

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/layouts/bots/(data)/add-flow-context.ts

@@ -0,0 +1,22 @@
+import React from "react";
+import type { AddKind } from "../(dict)/add-choices-dict";
+
+export type AddFlow = {
+    /**
+     * Opens the Add modal: pick a bot, a workspace or a computer.
+     */
+    openAdd: () => void;
+    /**
+     * Opens one add form straight away (the rail's "+" beside Workspaces,
+     * a workspace page's "New computer").
+     */
+    openForm: (params: { kind: AddKind }) => void;
+};
+
+/**
+ * The Add flow, shared by the rail and the pages in the bots layout.
+ */
+export const AddFlowContext = React.createContext<AddFlow>({
+    openAdd: () => {},
+    openForm: () => {},
+});