feat(desktop-settings): clean up copy and layout

desktop/src/features/agents/ui/AgentDefaultsEditor.tsx

@@ -39,6 +39,7 @@ import {
 } from "@/features/agents/ui/AgentConfigFields";
 import { cn } from "@/shared/lib/cn";
 import { Button } from "@/shared/ui/button";
+import { SettingsActionButton } from "@/features/settings/ui/SettingsActionButton";
 
 type SaveState = "idle" | "saving" | "saved" | "error";
 
@@ -259,6 +260,7 @@ export function AgentDefaultsEditor({
   const progressiveFieldsTransition = shouldReduceMotion
     ? { duration: 0 }
     : PROGRESSIVE_FIELDS_TRANSITION;
+  const SaveButton = flatLayout ? SettingsActionButton : Button;
 
   return (
     <div className={cn("min-w-0", flatLayout ? "space-y-7" : "space-y-4")}>
@@ -337,7 +339,7 @@ export function AgentDefaultsEditor({
           )}
           <div className="ml-auto flex items-center gap-3">
             {secondaryAction}
-            <Button
+            <SaveButton
               disabled={
                 !dirty ||
                 !configIsValid ||
@@ -351,7 +353,7 @@ export function AgentDefaultsEditor({
                 <Loader className="mr-1.5 size-3.5 animate-spin" />
               ) : null}
               Save defaults
-            </Button>
+            </SaveButton>
           </div>
         </div>
       )}

desktop/src/features/community-members/ui/CommunityMembersSettingsCard.tsx

@@ -20,7 +20,7 @@ import type {
   UserProfileSummary,
 } from "@/shared/api/types";
 import { normalizePubkey, truncatePubkey } from "@/shared/lib/pubkey";
-import { Button } from "@/shared/ui/button";
+import { SettingsActionButton as Button } from "@/features/settings/ui/SettingsActionButton";
 import {
   DropdownMenu,
   DropdownMenuContent,

desktop/src/features/custom-emoji/ui/CustomEmojiSettingsCard.tsx

@@ -14,7 +14,7 @@ import {
 } from "@/shared/api/customEmoji";
 import { pickAndUploadMedia } from "@/shared/api/tauri";
 import { rewriteRelayUrl } from "@/shared/lib/mediaUrl";
-import { Button } from "@/shared/ui/button";
+import { SettingsActionButton as Button } from "@/features/settings/ui/SettingsActionButton";
 import { Input } from "@/shared/ui/input";
 import { SettingsOptionGroup } from "@/features/settings/ui/SettingsOptionGroup";
 import { SettingsSectionHeader } from "@/features/settings/ui/SettingsSectionHeader";

desktop/src/features/local-archive/ui/LocalArchiveSettingsCard.tsx

@@ -17,7 +17,7 @@ import {
 } from "@/shared/constants/kinds";
 import { useChannelsQuery } from "@/features/channels/hooks";
 import { useIdentityQuery } from "@/shared/api/hooks";
-import { Button } from "@/shared/ui/button";
+import { SettingsActionButton as Button } from "@/features/settings/ui/SettingsActionButton";
 import { Checkbox } from "@/shared/ui/checkbox";
 import { Switch } from "@/shared/ui/switch";
 import {

desktop/src/features/notifications/lib/sound.ts

@@ -137,10 +137,14 @@ export function shouldPlayNotificationSound(
 
 const cache = new Map<SoundName, HTMLAudioElement>();
 
+export function createNotificationSound(name: SoundName): HTMLAudioElement {
+  return new Audio(`/sounds/${name}.mp3`);
+}
+
 function getAudio(name: SoundName): HTMLAudioElement {
   let audio = cache.get(name);
   if (!audio) {
-    audio = new Audio(`/sounds/${name}.mp3`);
+    audio = createNotificationSound(name);
     cache.set(name, audio);
   }
   return audio;

desktop/src/features/settings/UpdateChecker.tsx

@@ -1,6 +1,6 @@
 import { openUrl } from "@tauri-apps/plugin-opener";
 import { useUpdaterContext } from "./hooks/UpdaterProvider";
-import { Button } from "@/shared/ui/button";
+import { SettingsActionButton as Button } from "./ui/SettingsActionButton";
 import {
   SettingsOptionGroup,
   SettingsOptionRow,