fix(tui): open authorization links - #40905

What

Make OAuth device authorization links keyboard-accessible in the TUI. The waiting dialog now advertises o open, while c copy remains available as the manual fallback.

Before / After

Before: The authorization URL was visible and mouse-clickable, but keyboard users could only copy the device code or URL and open it manually.

After: Pressing o opens the authorization URL in the default browser. If browser launch fails, the dialog shows an error directing the user to copy the URL. Rendered links also use OpenTUI's native <a href> element so supported terminals receive hyperlink metadata.

How

• packages/tui/src/component/dialog-integration.tsx registers the modal o command and renders its key hint.
• packages/tui/src/ui/link.tsx renders the shared link through OpenTUI's native anchor element while preserving mouse opening.

Scope

This only changes automatic OAuth/device authorization dialogs. Manual code-entry dialogs are unchanged.

Testing

• bun typecheck from packages/tui
• bun run test test/cli/cmd/tui/integration-options.test.ts from packages/tui
• Full repository typecheck via the pre-push hook
• Real isolated PTY walkthrough with termctrl, from /connect through the OpenCode Console authorization dialog

Demo

Fresh isolated TUI showing o open and c copy in one action row. The displayed authorization attempt was canceled immediately after capture.