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/components/lanes/__tests__/WorkspaceHome.test.tsx

@@ -439,6 +439,43 @@ describe("WorkspaceHome", () => {
     expect(within(dialog).getByText("Rules here")).toBeInTheDocument();
     expect(within(dialog).queryByRole("textbox")).toBeNull();
   });
+
+  it("shows one memory file per tab", async () => {
+    vi.mocked(api.lanes.memory).mockResolvedValueOnce({
+      files: [
+        {
+          label: "CLAUDE.md",
+          path: "/r/CLAUDE.md",
+          content: "# Rules here",
+          size: 0,
+          mtime: "",
+          truncated: false,
+        },
+        {
+          label: "memory/a.md",
+          path: "/m/a.md",
+          content: "# Note A",
+          size: 0,
+          mtime: "",
+          truncated: false,
+        },
+      ],
+    });
+    const user = userEvent.setup();
+    renderHome();
+    expect(await screen.findByText("2 files the agent reads")).toBeInTheDocument();
+    await user.click(screen.getByRole("button", { name: "View memory" }));
+    const dialog = screen.getByRole("dialog", { name: "Memory" });
+    expect(within(dialog).getByRole("tab", { name: "CLAUDE.md" })).toHaveAttribute(
+      "aria-selected",
+      "true"
+    );
+    expect(within(dialog).getByText("Rules here")).toBeInTheDocument();
+    expect(within(dialog).queryByText("Note A")).toBeNull();
+    await user.click(within(dialog).getByRole("tab", { name: "memory/a.md" }));
+    expect(within(dialog).getByText("Note A")).toBeInTheDocument();
+    expect(within(dialog).queryByText("Rules here")).toBeNull();
+  });
 });
 
 describe("WorkspaceHome across workspaces", () => {