IMPROVED - Remove dock shadows, fix bounce artifact, mac-radius icons, gallery icon

- Drop all shadows (dock, icons, tooltip, corner pills); this also removes the
  square that showed behind an icon mid-bounce.
- Bounce now moves the whole tile (logo bg lives on the animated element), so
  nothing is left behind.
- Icons use a ~22% macOS-like corner radius (art carries its own shape).
- Portfolio gets an original photo/gallery icon (not Apple's system icon).

public/dock/about.svg

@@ -4,9 +4,9 @@
 <linearGradient id="gl" x1="0" y1="0" x2="0" y2="1">
 <stop offset="0" stop-color="#fff" stop-opacity="0.26"/><stop offset="0.5" stop-color="#fff" stop-opacity="0"/></linearGradient>
 </defs>
-<rect x="0" y="0" width="100" height="100" rx="28" fill="url(#bg)"/>
-<rect x="0" y="0" width="100" height="100" rx="28" fill="url(#gl)"/>
-<rect x="0.75" y="0.75" width="98.5" height="98.5" rx="27.25" fill="none" stroke="#fff" stroke-opacity="0.14" stroke-width="1.5"/>
+<rect x="0" y="0" width="100" height="100" rx="22" fill="url(#bg)"/>
+<rect x="0" y="0" width="100" height="100" rx="22" fill="url(#gl)"/>
+<rect x="0.75" y="0.75" width="98.5" height="98.5" rx="21.25" fill="none" stroke="#fff" stroke-opacity="0.14" stroke-width="1.5"/>
 <g fill="none" stroke="#fff" stroke-width="6" stroke-linecap="round" stroke-linejoin="round">
 <circle cx="50" cy="41" r="11"/><path d="M30 72 C30 57, 70 57, 70 72"/></g>
 </svg>