fix: use sun as default admin icon

admin/tests/app/icons.test.ts

@@ -19,7 +19,7 @@ import {
   Network,
   Pencil,
   Settings,
-  Square,
+  Sun,
   Tags,
   WandSparkles,
 } from '@lucide/vue'
@@ -59,16 +59,16 @@ describe('iconFor', () => {
     expect(iconFor('icon-edit')).toBe(Pencil)
   })
 
-  it('falls back to the neutral square for unknown, empty or missing names', () => {
-    expect(fallbackIcon).toBe(Square)
-    expect(iconFor('unknown-icon-name')).toBe(Square)
-    expect(iconFor('icon-unknown')).toBe(Square)
-    expect(iconFor('')).toBe(Square)
-    expect(iconFor(null)).toBe(Square)
-    expect(iconFor(undefined)).toBe(Square)
-    expect(iconFor('constructor')).toBe(Square)
-    expect(iconFor('toString')).toBe(Square)
-    expect(iconFor('__proto__')).toBe(Square)
+  it('falls back to the sun for unknown, empty or missing names', () => {
+    expect(fallbackIcon).toBe(Sun)
+    expect(iconFor('unknown-icon-name')).toBe(Sun)
+    expect(iconFor('icon-unknown')).toBe(Sun)
+    expect(iconFor('')).toBe(Sun)
+    expect(iconFor(null)).toBe(Sun)
+    expect(iconFor(undefined)).toBe(Sun)
+    expect(iconFor('constructor')).toBe(Sun)
+    expect(iconFor('toString')).toBe(Sun)
+    expect(iconFor('__proto__')).toBe(Sun)
   })
 
   it('maps every Winter alias onto a registered lucide icon', () => {