chore: v2.8.7 — Git SSH keys in tabs, safer Artifacts preview and search

- Settings → Git → Your git identity: SSH keys are one tab per host kind
  (GitHub · GitLab, AWS CodeCommit, More keys, Other hosts); opens on the
  AWS tab when only an RSA key exists.
- Artifacts: a file type the sandboxed preview cannot show (Office, zip,
  PDF) offers Download only, never a blank Preview.
- Artifacts search: `%`/`_`/`\` in a query match literally (LIKE ... ESCAPE).
- Skill frontmatter rewrite replaces a key with its continuation lines and
  quotes values YAML could misread.
- Plugin marketplace.json is read with a 1 MB streaming cap.
- Artifact lists look each owner up once.

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

@@ -6,7 +6,9 @@
  * a plugin is picked from the list its marketplace link answers (a link the
  * server cannot read opens the by-hand form), a skill is uploaded from one
  * Markdown file under the name the user types, or written in the dialog.
- * A card's right-click menu runs the same actions (Preview, Delete).
+ * A card's right-click menu runs the same actions (Preview, Delete). A file
+ * the sandbox cannot show (Office, zip, PDF) offers Download only, and the
+ * Add menu closes on Escape or a click outside it.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 import { describe, it, expect, vi, beforeEach } from "vitest";
@@ -253,4 +255,27 @@ describe("Artifacts", () => {
       "/api/artifacts/1/raw?path=report.html"
     );
   });
+
+  it("offers no preview for a file the sandbox cannot show, only its download", async () => {
+    vi.mocked(api.artifacts.list).mockResolvedValue({
+      items: [item({ title: "plan.docx", files: [{ path: "plan.docx", size: 10 }] })],
+    });
+    open();
+    const card = await screen.findByTestId("artifact-1");
+    expect(within(card).queryByRole("button", { name: "Preview" })).toBeNull();
+    expect(within(card).getByRole("link", { name: "Download" })).toBeInTheDocument();
+  });
+
+  it("closes the Add menu on Escape and on a click outside it", async () => {
+    const user = userEvent.setup();
+    open();
+    await screen.findByText("deploy");
+    await user.click(screen.getByTestId("artifacts-add"));
+    expect(screen.getByRole("button", { name: "Skill" })).toBeInTheDocument();
+    await user.keyboard("{Escape}");
+    expect(screen.queryByRole("button", { name: "Skill" })).toBeNull();
+    await user.click(screen.getByTestId("artifacts-add"));
+    await user.click(screen.getByText("report.html"));
+    expect(screen.queryByRole("button", { name: "Skill" })).toBeNull();
+  });
 });

client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap

@@ -7178,7 +7178,7 @@ exports[`screen snapshots > Settings — about 1`] = `
                 <span
                   class="text-status-warning/90"
                 >
-                  UI build v2.8.6 (rebuild client to match)
+                  UI build v2.8.7 (rebuild client to match)
                 </span>
               </p>
             </div>