feat: audit codebase (#72)

Reviewed-on: #72

crates/auto_update/src/lib.rs

@@ -63,6 +63,18 @@ struct GlobalAutoUpdater(Entity<AutoUpdater>);
 
 impl Global for GlobalAutoUpdater {}
 
+/// The subset of updater state the UI renders, so views can hold it in a small
+/// entity instead of observing the whole updater.
+#[derive(Clone, PartialEq)]
+pub struct UpdateDisplay {
+    /// Whether the running version is the newest release.
+    pub up_to_date: bool,
+    /// Whether a verified update is installed and waiting for a restart.
+    pub staged: bool,
+    /// A short, human-readable description of the current status.
+    pub status: SharedString,
+}
+
 pub struct AutoUpdater {
     updater: Entity<Updater>,
     status: UpdateStatus,
@@ -173,6 +185,15 @@ impl AutoUpdater {
         }
     }
 
+    /// Snapshot the state the UI renders.
+    pub fn display(&self) -> UpdateDisplay {
+        UpdateDisplay {
+            up_to_date: self.up_to_date(),
+            staged: self.staged(),
+            status: self.status(),
+        }
+    }
+
     /// Check the release host for a newer version, then download and install it.
     pub fn check(&mut self, cx: &mut Context<Self>) {
         self.updater.update(cx, |updater, cx| {