Baseline: full tree snapshot after git repository loss

The previous .git directory was found gutted (only info/ remained), so
history is unrecoverable locally. This commit restores version control
with the tree exactly as it stands: the working app, the preview-tracks
launcher on the artist hero, the scrollable-track-previews design bundle
(docs + approved mockups), and the Phase 0 validation artifacts.

src-tauri/icons/icon.svg

@@ -0,0 +1,22 @@
+<svg viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#41B7EE"/>
+      <stop offset="1" stop-color="#0C67B0"/>
+    </linearGradient>
+    <linearGradient id="sheen" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#FFFFFF" stop-opacity="0.14"/>
+      <stop offset="0.5" stop-color="#FFFFFF" stop-opacity="0"/>
+    </linearGradient>
+  </defs>
+  <rect width="512" height="512" rx="114" fill="url(#bg)"/>
+  <rect width="512" height="512" rx="114" fill="url(#sheen)"/>
+  <!-- waveform "stream": five bars riding a gentle flow -->
+  <g fill="#FFFFFF">
+    <rect x="91"  y="216" width="42" height="120" rx="21"/>
+    <rect x="163" y="166" width="42" height="200" rx="21"/>
+    <rect x="235" y="106" width="42" height="300" rx="21"/>
+    <rect x="307" y="146" width="42" height="200" rx="21"/>
+    <rect x="379" y="176" width="42" height="120" rx="21"/>
+  </g>
+</svg>