chore: v2.8.15 — Oh My Pi login sharing, omp --allow-home, Markdown Preview default, first-login password

- omp-share.js: an admin's switch (S3) runs omp's own auth broker + gateway as
  the host on loopback; a member's omp pane reaches it as a scoped client keyed
  by its pane token (clients file = live omp panes only), runs on
  --model agenthub/<model>, never holds a credential.
- omp catalog: --allow-home, so a workspace at the account's home keeps its
  sessions there (they were recorded under a temp dir and dropped).
- Settings → Appearance → Open Markdown as: Preview (default) or Raw, for
  Files/Changes, the config viewer and a chat's file panel.
- First-login password change and password rules, avatar URLs, Artifacts
  "Mine" includes installed shared skills/plugins, a member's own hook pages.

client/src/components/__tests__/MarkdownPreview.test.tsx

@@ -58,14 +58,25 @@ describe("MarkdownPreview", () => {
 describe("FileViewer — markdown preview", () => {
   const data = { text: "# Hello\n", truncated: false } as never;
 
-  it("switches a markdown file between raw and preview", async () => {
+  it("opens a markdown file rendered, and switches it to raw and back", async () => {
     render(<FileViewer state={{ path: "/x/CLAUDE.md", data, error: null }} onClose={vi.fn()} />);
+    expect(screen.getByRole("heading", { name: "Hello" })).toBeInTheDocument();
+    await userEvent.click(screen.getByRole("button", { name: "Raw" }));
     expect(screen.queryByTestId("markdown-preview")).toBeNull();
     expect(screen.getByText("# Hello")).toBeInTheDocument();
     await userEvent.click(screen.getByRole("button", { name: "Preview" }));
     expect(screen.getByRole("heading", { name: "Hello" })).toBeInTheDocument();
-    await userEvent.click(screen.getByRole("button", { name: "Raw" }));
-    expect(screen.queryByTestId("markdown-preview")).toBeNull();
+  });
+
+  it("opens it as source when Settings → Appearance says Raw", () => {
+    window.localStorage.setItem("agenthub.markdown.view", "raw");
+    try {
+      render(<FileViewer state={{ path: "/x/CLAUDE.md", data, error: null }} onClose={vi.fn()} />);
+      expect(screen.queryByTestId("markdown-preview")).toBeNull();
+      expect(screen.getByText("# Hello")).toBeInTheDocument();
+    } finally {
+      window.localStorage.removeItem("agenthub.markdown.view");
+    }
   });
 
   it("offers no preview for another file type", () => {