Increase min-width for all Pickers, minor style changes

- Increases the Picker min-width from 500 to 540
- Makes some changes to the styling of keyboard shortcuts in the command palette

styles/src/styleTree/commandPalette.ts

@@ -5,7 +5,7 @@ export default function commandPalette(theme: Theme) {
   return {
     keystrokeSpacing: 8,
     key: {
-      text: text(theme, "mono", "active", { size: "xs" }),
+      text: text(theme, "mono", "secondary", { size: "xs" }),
       cornerRadius: 4,
       background: backgroundColor(theme, "on300"),
       border: border(theme, "secondary"),