[client] UI refactor (#6069)

Refactor UI

---------

Co-authored-by: Eduard Gert <kontakt@eduardgert.de>
Co-authored-by: braginini <bangvalo@gmail.com>
Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: riccardom <riccardomanfrin@gmail.com>

client/ui/build/appicon.icon/Assets/wails_icon_vector.svg

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!--
+  macOS Icon Composer source. Designed on a 1024x1024 canvas with the bird
+  glyph centered and sized to ~75% of canvas width, leaving padding for
+  the system squircle treatment.
+-->
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024">
+  <g transform="translate(128, 227) scale(24.77)">
+    <path d="M21.4631 0.523438C17.8173 0.857913 16.0028 2.95675 15.3171 4.01871L4.66406 22.4734H17.5163L30.1929 0.523438H21.4631Z" fill="#F68330"/>
+    <path d="M17.5265 22.4737L0 3.88525C0 3.88525 19.8177 -1.44128 21.7493 15.1738L17.5265 22.4737Z" fill="#F68330"/>
+    <path d="M14.9236 4.70563L9.54688 14.0208L17.5158 22.4747L21.7385 15.158C21.0696 9.44682 18.2851 6.32784 14.9236 4.69727" fill="#F05252"/>
+  </g>
+</svg>

client/ui/build/appicon.icon/icon.json

@@ -0,0 +1,26 @@
+{
+  "fill" : {
+    "solid" : "srgb:1.00000,1.00000,1.00000,1.00000"
+  },
+  "groups" : [
+    {
+      "layers" : [
+        {
+          "image-name" : "wails_icon_vector.svg",
+          "name" : "wails_icon_vector"
+        }
+      ],
+      "shadow" : {
+        "kind" : "neutral",
+        "opacity" : 0.5
+      },
+      "specular" : true
+    }
+  ],
+  "supported-platforms" : {
+    "circles" : [
+      "watchOS"
+    ],
+    "squares" : "shared"
+  }
+}