Implement browser OAuth for ChatGPT subscriptions

Update app branding and OAuth callback handling, remove legacy Samsung
theme aliases, prune unavailable ChatGPT models, and delete cost data.

app/src/uri/mod.rs

@@ -112,6 +112,8 @@ pub enum UriHost {
     TabConfig,
     /// Focuses a specific terminal pane by its persistent session UUID.
     Session,
+    /// Handles OAuth callbacks for ChatGPT subscription authorization.
+    ChatGPT,
 }
 
 impl FromStr for UriHost {
@@ -135,6 +137,7 @@ impl FromStr for UriHost {
             "linear" => Ok(Self::Linear),
             "tab_config" if FeatureFlag::TabConfigs.is_enabled() => Ok(Self::TabConfig),
             "session" => Ok(Self::Session),
+            "chatgpt" => Ok(Self::ChatGPT),
             _ => Err(anyhow!("Received url with unexpected host: {}", s)),
         }
     }
@@ -570,6 +573,13 @@ impl UriHost {
                     log::warn!("session deep link could not find pane with given UUID");
                 }
             }
+            UriHost::ChatGPT => {
+                #[cfg(not(target_family = "wasm"))]
+                {
+                    crate::ai::chatgpt_auth::ChatGPTAuthModel::handle(ctx)
+                        .update(ctx, |model, ctx| model.handle_oauth_callback(url, ctx));
+                }
+            }
         }
     }
 
@@ -595,6 +605,7 @@ impl UriHost {
             // Handler picks the window itself based on `?new_window=true`.
             Self::TabConfig => W::Nothing,
             Self::Session => W::Nothing,
+            Self::ChatGPT => W::Nothing,
         }
     }
 }
@@ -1669,7 +1680,8 @@ fn validate_custom_uri(url: &Url) -> Result<UriHost> {
         | UriHost::Codex
         | UriHost::Linear
         | UriHost::TabConfig
-        | UriHost::Session => true,
+        | UriHost::Session
+        | UriHost::ChatGPT => true,
         // Auth and Home only allow the desktop redirect path
         UriHost::Auth | UriHost::Home => false,
     };