branding: the falcon replaces the waveform everywhere the app is seen

Kyle's pick — the deep-navy-glow rounded icon. Regenerated from the 1024
master through Tauri's own generator, so every surface comes off the same
art rather than a hand-resized copy per platform: icon.ico (16/24/32/48/
64/256 frames), icon.icns, the Square*Logo tiles Windows uses for the
Start menu and taskbar jump lists, and the Android and iOS sets. icon.svg
is the source SVG itself, so the vector beside the rasters is the one
they were cut from and not a stale ancestor.

public/logo.png is the app's own titlebar mark, drawn at 20px. It gets
the full-resolution master rather than a downscale — it is one asset, the
size costs nothing next to the artwork this app already holds, and there
is then no second file to keep in step when the icon changes again.

Verified in the running app: the titlebar draws the falcon, and the icon
extracted back out of the built exe is the new one, not a cached
resource.

src-tauri/icons/icon.svg

@@ -1,22 +1,29 @@
-<svg viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024" role="img" aria-labelledby="title desc">
+  <title id="title">SoulStream rounded app icon concept 4: Deep navy glow</title>
+  <desc id="desc">Review-only replacement candidate. Dimensional navy surface • restored falcon gradient. Exact approved falcon geometry.</desc>
   <defs>
-    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
+    <linearGradient id="rounded-4-mark-gradient" x1="252" y1="352" x2="690" y2="785" gradientUnits="userSpaceOnUse" color-interpolation="sRGB">
-      <stop offset="0" stop-color="#41B7EE"/>
+      <stop offset="0" stop-color="#31C0CB"/>
-      <stop offset="1" stop-color="#0C67B0"/>
+      <stop offset="0.48" stop-color="#31C0CB"/>
+      <stop offset="0.55" stop-color="#33BFD1"/>
+      <stop offset="0.63" stop-color="#35BADF"/>
+      <stop offset="0.71" stop-color="#38B6ED"/>
+      <stop offset="0.78" stop-color="#39B3F1"/>
+      <stop offset="1" stop-color="#39B3F1"/>
     </linearGradient>
-    <linearGradient id="sheen" x1="0" y1="0" x2="0" y2="1">
+    <linearGradient id="rounded-4-surface-gradient" x1="130" y1="50" x2="880" y2="980" gradientUnits="userSpaceOnUse">
-      <stop offset="0" stop-color="#FFFFFF" stop-opacity="0.14"/>
+      <stop offset="0" stop-color="#0A2330"/>
-      <stop offset="0.5" stop-color="#FFFFFF" stop-opacity="0"/>
+      <stop offset="0.52" stop-color="#07141F"/>
+      <stop offset="1" stop-color="#040A10"/>
     </linearGradient>
+    <radialGradient id="rounded-4-glow-gradient" cx="0" cy="0" r="1" gradientUnits="userSpaceOnUse" gradientTransform="translate(270 220) rotate(43) scale(660)">
+      <stop offset="0" stop-color="#31C0CB" stop-opacity="0.18"/>
+      <stop offset="0.58" stop-color="#1F8FC9" stop-opacity="0.05"/>
+      <stop offset="1" stop-color="#07141F" stop-opacity="0"/>
+    </radialGradient>
   </defs>
-  <rect width="512" height="512" rx="114" fill="url(#bg)"/>
+  <rect width="1024" height="1024" rx="232" fill="url(#rounded-4-surface-gradient)"/>
-  <rect width="512" height="512" rx="114" fill="url(#sheen)"/>
+  <rect width="1024" height="1024" rx="232" fill="url(#rounded-4-glow-gradient)"/>
-  <!-- waveform "stream": five bars riding a gentle flow -->
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