feat: right-click menus everywhere, workspace/session cost, long-term DB safety

Right-click menus: one portal shell (components/ContextMenu.tsx) for every
item with actions - sidebar/Recents/archived session rows (SessionMenu),
console tabs, pane headers, the Changes panel's files/tree/commits, the
workspace home, sessions outside a workspace (SessionRowMenu: Sessions
table, Dashboard, Activity, Workflow runs), prompt images, every Settings
list and every Claude Code/Codex config list (FileItemMenu). Buttons stay;
a delete keeps its button's confirm; the shell stops portal clicks from
reaching the card that opened it.

Status bar: Workspace $ and Session $ on the Workspace page, from
?lane= on GET /api/pricing/cost and the focused/replayed session's cost.

Database, no data dropped: synchronous=NORMAL, journal_size_limit 64 MB,
hourly PASSIVE checkpoint + PRAGMA optimize, idx_events_session_created
(replacing the redundant idx_events_session), watchdog reads
sessions.transcript_path, transcript parsed before the hook's write
transaction, GET /api/sessions/:id?events=0 for the web page (reloads only
on its own session, debounced), streamed export, transactional clear-data
and chunked cleanup, subagent import reads tool_use_ids once, runtime logs
rotated past 5 MB.

client/src/pages/__tests__/AiRouterConfig.test.tsx

@@ -233,4 +233,25 @@ describe("AiRouterConfig — testing an endpoint before saving it", () => {
     await user.type(screen.getByLabelText("aiRouter.fieldBaseUrl"), "2");
     await waitFor(() => expect(screen.queryByTestId("router-test-result")).toBeNull());
   });
+
+  it("opens a profile's Edit and Remove from a right-click; the built-in row has no menu", async () => {
+    vi.mocked(api.aiRouters.list).mockResolvedValue({ items: [native, nineRouter] });
+    const confirm = vi.spyOn(window, "confirm").mockReturnValueOnce(false);
+    const user = userEvent.setup();
+    render(<AiRouterConfig />);
+    const row = (await screen.findByText("9Router")).closest("tr")!;
+
+    await user.pointer({ keys: "[MouseRight]", target: screen.getByText(native.label) });
+    expect(screen.queryByRole("menu")).toBeNull();
+
+    await user.pointer({ keys: "[MouseRight]", target: row });
+    await user.click(screen.getByRole("menuitem", { name: "aiRouter.remove" }));
+    expect(confirm).toHaveBeenCalledWith("aiRouter.removeConfirm:9Router");
+    expect(api.aiRouters.remove).not.toHaveBeenCalled();
+
+    await user.pointer({ keys: "[MouseRight]", target: row });
+    await user.click(screen.getByRole("menuitem", { name: "aiRouter.edit" }));
+    expect(screen.getByRole("dialog")).toBeInTheDocument();
+    confirm.mockRestore();
+  });
 });