Clarify community theme sync copy

Signed-off-by: kenny lopez <klopez4212@gmail.com>

desktop/src/features/settings/ui/SettingsPanels.tsx

@@ -633,7 +633,8 @@ function ThemeSettingsCard() {
       <div className="space-y-12">
         <SettingsOptionGroup
           data-testid="appearance-theme-card"
-          title="Theme · This community"
+          description="Theme choices for this community sync across your devices."
+          title="Theme"
         >
           <SettingsOptionRow data-testid="appearance-color-mode-row">
             <div className="min-w-0">

desktop/tests/e2e/buzz-theme-screenshots.spec.ts

@@ -492,10 +492,16 @@ test("appearance groups theme and preferences into labeled rows", async ({
 
   await expect(
     themeCard.getByRole("heading", {
-      name: "Theme · This community",
+      name: "Theme",
       exact: true,
     }),
   ).toBeVisible();
+  await expect(
+    themeCard.getByText(
+      "Theme choices for this community sync across your devices.",
+      { exact: true },
+    ),
+  ).toBeVisible();
   await expect(
     preferencesCard.getByRole("heading", {
       name: "Preferences",