Switch Gemma callers to deepinfra provider

Use signed-in user's HF OAuth token for inference

Fix logout, OAuth state cleanup, HF_TOKEN diagnostic

Fix inference auth and app branding

need to port to IOS and fix many bugs

feat(mobile): full feature parity with web — furi/TTS rollout, streak, multi-lang, level picker, story quiz

fix(auth): keep HF OAuth inside the iframe + SameSite=None session cookie

fix(auth): derive HF OAuth redirect_uri from request origin

fix(auth): use SameSite=None for HF OAuth state cookies + _top login link

fix(auth): set HF OAuth state cookies on response not cookies() helper

Deploy: PraxaLing rename + HF Docker Space

feat: phrases page, level picker, furigana, HF inference fix, more scenarios

feat: full redesign — dark cinematic UI, interactive dialogues, Gemma 4 31B vision