fix(keychain): persist access state, update granted UI, and resolve build errors

src-tauri/src/ipc.rs

@@ -278,6 +278,8 @@ pub struct PersistedSettings {
     // frontend. The field is kept on legacy persisted JSON only; serde ignores
     // unknown fields when decoding, so existing installs migrate cleanly.
     pub auto_check_updates: bool,
+    #[serde(default)]
+    pub keychain_access_granted: bool,
 }
 
 #[derive(Clone, Debug, Serialize, TS)]

src-tauri/src/settings.rs

@@ -289,6 +289,7 @@ fn default_settings() -> PersistedSettings {
         media_cookie_source: MediaCookieSource::None,
         site_logins: Vec::new(),
         auto_check_updates: true,
+        keychain_access_granted: false,
     }
 }