Add native chat background and guarded HA YAML access

platform/openwebui/theme/midnight-aurora.svg

@@ -0,0 +1,33 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="2560" height="1440" viewBox="0 0 2560 1440">
+  <defs>
+    <linearGradient id="base" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#050811"/>
+      <stop offset="0.52" stop-color="#0a1020"/>
+      <stop offset="1" stop-color="#070a12"/>
+    </linearGradient>
+    <radialGradient id="blue" cx="0.14" cy="0.18" r="0.58">
+      <stop offset="0" stop-color="#2563eb" stop-opacity="0.62"/>
+      <stop offset="0.42" stop-color="#2563eb" stop-opacity="0.17"/>
+      <stop offset="1" stop-color="#2563eb" stop-opacity="0"/>
+    </radialGradient>
+    <radialGradient id="violet" cx="0.86" cy="0.12" r="0.52">
+      <stop offset="0" stop-color="#7c3aed" stop-opacity="0.58"/>
+      <stop offset="0.44" stop-color="#7c3aed" stop-opacity="0.16"/>
+      <stop offset="1" stop-color="#7c3aed" stop-opacity="0"/>
+    </radialGradient>
+    <radialGradient id="teal" cx="0.68" cy="0.94" r="0.55">
+      <stop offset="0" stop-color="#0f766e" stop-opacity="0.48"/>
+      <stop offset="0.46" stop-color="#0f766e" stop-opacity="0.13"/>
+      <stop offset="1" stop-color="#0f766e" stop-opacity="0"/>
+    </radialGradient>
+    <filter id="soft"><feGaussianBlur stdDeviation="54"/></filter>
+  </defs>
+  <rect width="2560" height="1440" fill="url(#base)"/>
+  <rect width="2560" height="1440" fill="url(#blue)"/>
+  <rect width="2560" height="1440" fill="url(#violet)"/>
+  <rect width="2560" height="1440" fill="url(#teal)"/>
+  <g fill="none" filter="url(#soft)" opacity="0.20">
+    <path d="M-180 1040 C420 650 760 1250 1420 820 S2250 540 2750 920" stroke="#38bdf8" stroke-width="70"/>
+    <path d="M-120 260 C520 580 840 110 1470 430 S2250 710 2740 260" stroke="#a78bfa" stroke-width="58"/>
+  </g>
+</svg>