feat: Implement oauth auth code and refresh token flows

src/web/pages/resources/common.css

@@ -123,8 +123,9 @@ small.error {
 .panel {
     --preferred-width: 12rem + 40dvw;
     --maximum-width: 48rem;
+    --minimum-width: 32rem;
 
-    width: min(clamp(24rem, var(--preferred-width), var(--maximum-width)), calc(100dvw - 3rem));
+    width: min(clamp(var(--minimum-width), var(--preferred-width), var(--maximum-width)), calc(100dvw - 3rem));
     border-radius: var(--border-radius-lg);
     background-color: var(--panel-bg);
     padding-inline: 1.5rem;
@@ -184,6 +185,10 @@ a, a:visited {
     color: oklch(from var(--c1) var(--name-lightness) c h);
 }
 
+code {
+    color: oklch(from var(--secondary) var(--name-lightness) c h);
+}
+
 input, button, a.button {
     display: inline-block;
     padding: 0.5em;