feat(ui): a Claude-Desktop-style home for every workspace

/workspace?lane=<id> opens on the workspace's home (WorkspaceHome): a prompt
box whose Start opens a new session in the first free pane slot, Recents (a
live session attaches its pane, any other opens its transcript, nothing
resumes), and Instructions / Memory / Context / Folder. Instructions live in
lanes.instructions, extra folders and uploaded files in the new lane_sources
table (copies under <data dir>/workspace-context/<lane id>/); spawnRun reads
them from the lane's rows and hands Claude --add-dir + an appended system
prompt file, Codex --add-dir + developer_instructions. Memory is read-only.

Every dashboard pane carries AGENTHUB_RUN_ID; hooks forward it and the run
records which session the pane holds (a Claude pane follows /clear and
/resume but not a nested claude -p), so the sidebar and notifications open
the right pane (&run=). Settings loses its Projects group; Worktrees now
decides which worktrees Add folder suggests.

client/src/pages/SettingsHub.tsx

@@ -1,13 +1,13 @@
 /**
  * @file SettingsHub.tsx
  * @description The Settings page: `/settings/<section>`, a left nav grouped
- * General / Agents / Routing / Git / Projects (a `<select>` below `md`), a
+ * General / Agents / Routing / Git (a `<select>` below `md`), a
  * search box over `SETTINGS_INDEX` (`lib/settingsSearch.ts`; Ctrl/Cmd+F
  * focuses it, Enter opens the first match, Escape clears), and one page per
  * section. A tool's own settings live under `agents/<id>` — Claude Code and
  * Codex have their own pages, every other installed, enabled catalog tool the
  * generic `AiToolConfig` — and a tool's page is hidden while that tool is
- * disabled. Each project in `GET /api/projects` gets `projects/<encoded root>`.
+ * disabled. A workspace's own settings live on its home, not here.
  * The old `?tool=<id>` query and `#ai-tools` hash redirect to the path form.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
@@ -20,7 +20,6 @@ import {
   Bot,
   Boxes,
   Coins,
-  FolderGit2,
   GitBranch,
   KeyRound,
   Orbit,
@@ -37,18 +36,14 @@ import { CodexConfig } from "./CodexConfig";
 import { AiToolConfig } from "./AiToolConfig";
 import { AiRouterConfig } from "./AiRouterConfig";
 import { GitCredentialsConfig } from "./GitCredentialsConfig";
-import { ProjectSettings } from "./ProjectSettings";
 import { AppearanceSettings } from "../components/settings/AppearanceSettings";
 import { AiToolsSettings } from "../components/settings/AiToolsSettings";
 import { PricingSettings } from "../components/settings/PricingSettings";
 import { WorktreeVisibilitySettings } from "../components/settings/WorktreeVisibilitySettings";
 import { useAiTools } from "../hooks/useAiTools";
-import { useLanes } from "../hooks/useLanes";
-import { api } from "../lib/api";
-import type { Project } from "../lib/types";
 import { rankSettings, SETTINGS_INDEX, type SettingsEntry } from "../lib/settingsSearch";
 
-const GROUPS = ["general", "agents", "routing", "git", "projects"] as const;
+const GROUPS = ["general", "agents", "routing", "git"] as const;
 type Group = (typeof GROUPS)[number];
 
 interface Section {
@@ -76,22 +71,8 @@ export function SettingsHub() {
   const location = useLocation();
   const navigate = useNavigate();
   const aiTools = useAiTools();
-  const { lanes, refresh: refreshLanes } = useLanes();
-  const [projects, setProjects] = useState<Project[] | null>(null);
   const [query, setQuery] = useState("");
   const searchRef = useRef<HTMLInputElement>(null);
-  const laneKey = lanes.map((l) => l.id).join(",");
-
-  useEffect(() => {
-    let live = true;
-    api.projects
-      .list()
-      .then((r) => live && setProjects(r.projects))
-      .catch(() => live && setProjects([]));
-    return () => {
-      live = false;
-    };
-  }, [laneKey]);
 
   useEffect(() => {
     const onKey = (e: KeyboardEvent) => {
@@ -215,26 +196,6 @@ export function SettingsHub() {
       ...s("worktrees"),
       render: () => <WorktreeVisibilitySettings />,
     },
-    ...(projects ?? []).flatMap((p) =>
-      p.root === null
-        ? []
-        : [
-            {
-              id: `projects/${encodeURIComponent(p.root)}`,
-              group: "projects" as const,
-              Icon: FolderGit2,
-              title: p.name,
-              description: t("settingsNav.section.project.description"),
-              render: () => (
-                <ProjectSettings
-                  project={{ ...p, root: p.root as string }}
-                  lanes={lanes}
-                  onForgotten={() => void refreshLanes()}
-                />
-              ),
-            },
-          ]
-    ),
   ];
 
   const entries: SettingsEntry[] = sections.flatMap((sec) => [
@@ -267,8 +228,8 @@ export function SettingsHub() {
   }
   const active = sections.find((x) => x.id === rest);
   if (!active) {
-    // A catalog tool or project page exists only once its list has loaded.
-    if (!aiTools.loaded || projects === null) return null;
+    // A catalog tool page exists only once the tool list has loaded.
+    if (!aiTools.loaded) return null;
     return <Navigate to="/settings/general" replace />;
   }