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/(partials)/rail-section-label.tsx

@@ -0,0 +1,30 @@
+import type { ReactNode } from "react";
+import Divider from "@moduletrace/twui/layout/Divider";
+import Row from "@moduletrace/twui/layout/Row";
+import Span from "@moduletrace/twui/layout/Span";
+
+type Props = {
+    title: string;
+    /**
+     * A small control on the right, e.g. the "+" beside Workspaces.
+     */
+    action?: ReactNode;
+};
+
+/**
+ * Heads a section of the rail. When the rail collapses to icons it's a
+ * hairline instead.
+ */
+export default function RailSectionLabel({ title, action }: Props) {
+    return (
+        <>
+            <Row className="hidden lg:flex shrink-0 h-8 mt-3 gap-2! flex-nowrap items-center justify-between px-3">
+                <Span className="text-[11px] font-bold uppercase tracking-wide leading-4 text-ink-secondary">
+                    {title}
+                </Span>
+                {action}
+            </Row>
+            <Divider className="lg:hidden shrink-0 mx-1 my-2 w-auto border-hairline dark:border-hairline" />
+        </>
+    );
+}