feat(desktop): polish desktop shell and shared WebUI surfaces (#4195)

* feat(desktop): add native host scaffold

* feat(webui): track turns and usage in gateway

* feat(webui): polish desktop chat experience

* feat(apps): add ArcGIS and Joplin logos

* feat(desktop): polish shell and shared surfaces

* fix(webui): avoid preview chips for glob references

* test: align CI expectations for token fallback

* feat(webui): preview prompt rail entries

* feat(webui): add prompt navigator drawer

* style(webui): refine prompt navigator placement

* style(webui): align prompt navigator with header actions

* style(webui): simplify prompt navigator header

* refactor(webui): clean thread resource refresh

* feat(desktop): add native reply notifications

* fix(webui): preserve desktop restart and replay state

* fix(desktop): harden gateway proxy startup

* fix(web): fall back when readability is unavailable

* fix(desktop): hide window instead of closing on macos

* fix(webui): unify desktop header actions

* fix(webui): simplify prompt history rows

* fix(desktop): log notification delivery failures

* chore(desktop): clean source package artifacts

* fix(cron): support one-time relative reminders

* fix(webui): reveal scroll button in place

* Revert "fix(cron): support one-time relative reminders"

This reverts commit 4c4661da120a3c7283e0768412bae48604e7390b.

* refactor(webui): extract token usage heatmap

* docs(desktop): clarify contributor guides

---------

Co-authored-by: chengyongru <2755839590@qq.com>

webui/src/tests/code-block.test.tsx

@@ -51,6 +51,25 @@ describe("CodeBlock", () => {
     expect(screen.getByTestId("plain-code-fallback")).toHaveClass("text-foreground/90");
   });
 
+  it("can render without chat-style chrome for file previews", () => {
+    render(
+      <ThemeProvider theme="light">
+        <CodeBlock
+          language="html"
+          code="<main />"
+          chrome="none"
+          highlight={false}
+          showLineNumbers
+        />
+      </ThemeProvider>,
+    );
+
+    expect(screen.queryByText("html")).not.toBeInTheDocument();
+    expect(screen.queryByRole("button", { name: /copy/i })).not.toBeInTheDocument();
+    expect(screen.getByText("1")).toBeInTheDocument();
+    expect(screen.getByTestId("plain-code-fallback")).toHaveClass("bg-transparent");
+  });
+
   it("falls back to 'text' language when language is undefined", async () => {
     render(
       <ThemeProvider theme="dark">