chore: Refine the UI (#102)

* update deps

* update window options

* linux title bar

* fix build

* .

* fix build

* rounded corners on linux

* .

* .

* fix i18n key

* fix change subject modal

* .

* update new account

* .

* update relay modal

* .

* fix i18n keys

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Co-authored-by: reya <reya@macbook.local>

assets/icons/plus.svg

@@ -1,3 +1,3 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="none" viewBox="0 0 24 24">
-  <path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M12 3.75V12m0 0v8.25M12 12H3.75M12 12h8.25"/>
+  <path stroke="currentColor" stroke-linecap="round" stroke-width="2" d="M12 4v8m0 0v8m0-8H4m8 0h8"/>
 </svg>