feat(ai-templates): regenerate gallery thumbnails with account avatar

Regenerate the three style thumbnails so they show a real account
avatar instead of a blank header. Drop the verified.svg source; only
the rasterized verified.png is read at render time.

public/images/ai-templates/verified.svg

@@ -1,11 +0,0 @@
-<svg
-  xmlns="http://www.w3.org/2000/svg"
-  width="24"
-  height="24"
-  viewBox="0 0 24 24"
-  fill="#1D9BF0"
-  class="icon icon-tabler icons-tabler-filled icon-tabler-rosette-discount-check"
->
-  <path stroke="none" d="M0 0h24v24H0z" fill="none"/>
-  <path d="M12.01 2.011a3.2 3.2 0 0 1 2.113 .797l.154 .145l.698 .698a1.2 1.2 0 0 0 .71 .341l.135 .008h1a3.2 3.2 0 0 1 3.195 3.018l.005 .182v1c0 .27 .092 .533 .258 .743l.09 .1l.697 .698a3.2 3.2 0 0 1 .147 4.382l-.145 .154l-.698 .698a1.2 1.2 0 0 0 -.341 .71l-.008 .135v1a3.2 3.2 0 0 1 -3.018 3.195l-.182 .005h-1a1.2 1.2 0 0 0 -.743 .258l-.1 .09l-.698 .697a3.2 3.2 0 0 1 -4.382 .147l-.154 -.145l-.698 -.698a1.2 1.2 0 0 0 -.71 -.341l-.135 -.008h-1a3.2 3.2 0 0 1 -3.195 -3.018l-.005 -.182v-1a1.2 1.2 0 0 0 -.258 -.743l-.09 -.1l-.697 -.698a3.2 3.2 0 0 1 -.147 -4.382l.145 -.154l.698 -.698a1.2 1.2 0 0 0 .341 -.71l.008 -.135v-1l.005 -.182a3.2 3.2 0 0 1 3.013 -3.013l.182 -.005h1a1.2 1.2 0 0 0 .743 -.258l.1 -.09l.698 -.697a3.2 3.2 0 0 1 2.269 -.944zm3.697 7.282a1 1 0 0 0 -1.414 0l-3.293 3.292l-1.293 -1.292l-.094 -.083a1 1 0 0 0 -1.32 1.497l2 2l.094 .083a1 1 0 0 0 1.32 -.083l4 -4l.083 -.094a1 1 0 0 0 -.083 -1.32z" />
-</svg>