Improve OAuth login UI with consistent dialog component

- Add LoginDialogComponent with proper borders (top/bottom DynamicBorder)
- Refactor all OAuth providers to use racing approach (browser callback vs manual paste)
- Add onEscape handler to Input component for cancellation
- Add abortable sleep for GitHub Copilot polling (instant cancel on Escape)
- Show OS-specific click hint (Cmd+click on macOS, Ctrl+click elsewhere)
- Clear content between login phases (fixes GitHub Copilot two-phase flow)
- Use InteractiveMode's showStatus/showError for result messages
- Reorder providers: Anthropic, ChatGPT, GitHub Copilot, Gemini CLI, Antigravity

packages/ai/src/utils/oauth/index.ts

@@ -133,6 +133,11 @@ export function getOAuthProviders(): OAuthProviderInfo[] {
 			name: "Anthropic (Claude Pro/Max)",
 			available: true,
 		},
+		{
+			id: "openai-codex",
+			name: "ChatGPT Plus/Pro (Codex Subscription)",
+			available: true,
+		},
 		{
 			id: "github-copilot",
 			name: "GitHub Copilot",
@@ -148,10 +153,5 @@ export function getOAuthProviders(): OAuthProviderInfo[] {
 			name: "Antigravity (Gemini 3, Claude, GPT-OSS)",
 			available: true,
 		},
-		{
-			id: "openai-codex",
-			name: "ChatGPT Plus/Pro (Codex Subscription)",
-			available: true,
-		},
 	];
 }