The header knows who is here; my cases; controls that scale with the text

A session link top right on a site with sign-in, and on a page with
pictures the wordmark as its own bar over the strip. A list may be
narrowed to the signed-in person's own records ({user.email}, from the
session), and an attachment follows the list that shows its record.
Form controls are sized in em: the date picker's icon and the file
picker's button scale and take the field's colours.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/server/oidc.rs

@@ -50,6 +50,11 @@ const NONCE_KEY: &str = "oidc_nonce";
 const REDIRECT_KEY: &str = "oidc_post_login_redirect";
 
 impl Oidc {
+    /// Whether a provider is configured.
+    pub fn enabled(&self) -> bool {
+        self.inner.is_some()
+    }
+
     /// Sign-in disabled: what a content-only instance has, and what a
     /// test builds an `AppState` with.
     pub fn disabled() -> Self {