fix: restore missing Tron chain gradient icons (lost in the compat revert)

icons/chains/gradient/Tron.svg is what NetworkFlowRvItem actually renders
per-row (chain.icon, not the token icon) - missed this one when restoring
the token-level TRX.svg earlier. Also restoring the pezkuwi-overlay copy
for consistency. Both are static assets, unrelated to the chains.json
parsing incompatibility that forced master back to 7a087cf.

icons/chains/gradient/Tron.svg

@@ -0,0 +1,10 @@
+<svg width="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M0 14C0 6.26801 6.26801 0 14 0H34C41.732 0 48 6.26801 48 14V34C48 41.732 41.732 48 34 48H14C6.26801 48 0 41.732 0 34V14Z" fill="url(#paint0_linear_tron)"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M13 15.5L24.5 13L35 16.7L24.9 27.9L13 15.5ZM24.1 30.1L33.6 18.7L25.5 30.9L24.1 30.1ZM22.8 30.9L14.4 17L23 26.3L22.8 30.9Z" fill="white"/>
+<defs>
+<linearGradient id="paint0_linear_tron" x1="0" y1="0" x2="48" y2="48" gradientUnits="userSpaceOnUse">
+<stop stop-color="#FF3B30"/>
+<stop offset="1" stop-color="#B8001F"/>
+</linearGradient>
+</defs>
+</svg>

pezkuwi-overlay/icons/chains/gradient/Tron.svg

@@ -0,0 +1,10 @@
+<svg width="48" height="48" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M0 14C0 6.26801 6.26801 0 14 0H34C41.732 0 48 6.26801 48 14V34C48 41.732 41.732 48 34 48H14C6.26801 48 0 41.732 0 34V14Z" fill="url(#paint0_linear_tron)"/>
+<path fill-rule="evenodd" clip-rule="evenodd" d="M13 15.5L24.5 13L35 16.7L24.9 27.9L13 15.5ZM24.1 30.1L33.6 18.7L25.5 30.9L24.1 30.1ZM22.8 30.9L14.4 17L23 26.3L22.8 30.9Z" fill="white"/>
+<defs>
+<linearGradient id="paint0_linear_tron" x1="0" y1="0" x2="48" y2="48" gradientUnits="userSpaceOnUse">
+<stop stop-color="#FF3B30"/>
+<stop offset="1" stop-color="#B8001F"/>
+</linearGradient>
+</defs>
+</svg>