Expose OpenAI OAuth in AI settings

[Bortlesboat]

What

Brings the OpenAI inference OAuth flow ("Sign in with ChatGPT") to the AI settings panel.

The Rust core already implements openhuman.inference_openai_oauth_{start,complete,status,disconnect}, and onboarding (ApiKeysStep) already exposes them — but the settings panel only accepted a manually pasted API key. So a user who skipped OAuth during onboarding (or wanted to re-check / disconnect later) had no way to manage ChatGPT sign-in from Settings. This closes that gap.

How

• New self-contained OpenAiOAuthConnect component: status probe → start → paste loopback redirect URL → complete, plus disconnect. All driven by the existing core RPCs; no backend changes.
• Wired into the OpenAI provider's ProviderKeyDialog (the API-key field stays as the alternative path).
• Two-step paste flow mirrors onboarding intentionally — the system browser redirects to a local http://127.0.0.1:1455/ callback the desktop app can't read directly.
• All user-facing strings localized (en.ts + chunk parity across all locales).

Tests / checks

• OpenAiOAuthConnect.test.tsx — 11 cases: connected/disconnected status, full start→complete flow, disconnect, desktop-only guard, missing-callback + start/complete/disconnect error paths. Component coverage 98.5% lines / 95% branches.
• Extended the existing AIPanel "open OpenAI dialog" test to assert the ChatGPT sign-in surface renders.
• Green locally: tsc --noEmit, ESLint (0 errors), Prettier, pnpm i18n:check (0 missing/extra/drift), 38 tests.

Notes

• This supersedes the earlier version of this PR, rebased cleanly onto current main and reworked against the present AIPanel.tsx.
• Follow-up opportunity (not in this PR to keep the diff focused): onboarding's inline OAuth block could later be replaced with this shared component to dedupe.
• Local pre-push hook's lint:commands-tokens step can't run on Windows (it's a bash -c '… { } …' script cmd.exe rejects) and scans src/components/commands/, which this PR doesn't touch — it runs fine on CI/Linux. All other hook steps (format, lint, compile) pass.

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