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

feat(mobile/phrases): parity with web — kanji, related words, furigana, TTS, progress bar

feat: mobile brutalist theme + hero polish

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

feat: rebrand to DialogueDock, update hero video and button hover styles

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