Fix horizontal overflow: overflow-x-hidden on body and app, remove shrink-0 from 42ch spans

The 42ch fixed-width spans with shrink-0 prevented flex from shrinking
them when the container was narrower, causing horizontal scrolling.
Also added overflow-x: hidden on body and #app as a safety net.

src/popup/views/home.js

@@ -40,7 +40,7 @@ function render(ctx) {
             }
             const addrUsd = formatUsd(getAddressValueUsd(addr));
             html += `<div class="flex text-xs">`;
-            html += `<span class="shrink-0" style="width:42ch">${addr.address}</span>`;
+            html += `<span style="width:42ch">${addr.address}</span>`;
             html += `<span class="text-right text-muted flex-1">${addrUsd}</span>`;
             html += `</div>`;
             html += balanceLinesForAddress(addr);